Biology:Olive oil

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Short description: Liquid fat extracted by pressing olives

Template:Infobox oils

Olive oil is a liquid fat obtained from olives (the fruit of Olea europaea; family Oleaceae), a traditional tree crop of the Mediterranean Basin, produced by pressing whole olives and extracting the oil. Olive oil is the most common vegetable oil. It is commonly used in cooking, for frying foods or as a salad dressing. It is also used in cosmetics, pharmaceuticals, and soaps, and as a fuel for traditional oil lamps, and has additional uses in some religions. There is limited evidence of its possible health benefits. The olive is one of three core food plants in Mediterranean cuisine; the other two are wheat and grapes. Olive trees have been grown around the Mediterranean since the 8th millennium BC.

The top five producers of olive oil by volume are Spain , Morocco, Turkey, Greece, and Italy. However, per capita national consumption is highest in Greece, followed by Spain and Italy.

The composition of olive oil varies with the cultivar, altitude, time of harvest and extraction process. It consists mainly of oleic acid (up to 83%), with smaller amounts of other fatty acids including linoleic acid (up to 21%) and palmitic acid (up to 20%). Extra virgin olive oil is required to have no more than 0.8% free acidity and is considered to have favorable flavor characteristics.

History

Olive oil has long been a common ingredient in Mediterranean cuisine, including ancient Greek and Roman cuisine. Wild olives, which originated in Asia Minor, were collected by Neolithic people as early as the 8th millennium BC.[1][citation not found][2][better source needed] Besides food, olive oil has been used for religious rituals, medicines, as a fuel in oil lamps, soap-making, and skin care application. The Spartans and other Greeks used oil to rub themselves while exercising in the gymnasia. From its beginnings early in the 7th century BC, the cosmetic use of olive oil quickly spread to all of the Hellenic city states, together with athletes training in the nude, and lasted close to a thousand years despite its great expense.[3][4] Olive oil was also popular as a form of birth control; Aristotle in his History of Animals recommends applying a mixture of olive oil combined with either oil of cedar, ointment of lead, or ointment of frankincense to the cervix to prevent pregnancy.[5]

Early cultivation

Ancient Greek olive oil production workshop in Klazomenai, Ionia (modern Turkey)

It is not clear when and where olive trees were first domesticated. According to an article published by Reviews in Environmental Science and Biotechnology the modern olive tree most likely originated in ancient Persia and Mesopotamia spreading towards Syria and Israel in the Mediterranean Basin where it was cultivated and later introduced to North Africa. Some scholars have argued that olive cultivation originated with the Ancient Egyptians.[6]

The olive tree reached Greece, Carthage and Libya sometime in the 28th century BC, having been spread westward by the Phoenicians.[6] Until around 1500 BC, eastern coastal areas of the Mediterranean were most heavily cultivated.[citation needed] Evidence also suggests that olives were being grown in Crete as long ago as 2500 BC. The earliest surviving olive oil amphorae date to 3500 BC (Early Minoan times), though the production of olive oil is assumed to have started before 4000 BC. Olive trees were certainly cultivated by the Late Minoan period (1500 BC) in Crete, and perhaps as early as the Early Minoan.[7] The cultivation of olive trees in Crete became particularly intense in the post-palatial period and played an important role in the island's economy, as it did across the Mediterranean.[citation needed] Later, as Greek colonies were established in other parts of the Mediterranean, olive farming was introduced to places like Spain and continued to spread throughout the Roman Empire.[6]

Olive trees were introduced to the Americas in the 16th century AD when cultivation began in areas that enjoyed a climate similar to the Mediterranean such as Chile , Argentina and California .[6]

Recent genetic studies suggest that species used by modern cultivators descend from multiple wild populations, but a detailed history of domestication is not yet forthcoming.[8]

Trade and production

Ancient oil press (Bodrum Museum of Underwater Archaeology, Bodrum, Turkey)

Archaeological evidence shows that by 6000 BC olives were being turned into olive oil.[9] and 4500 BC at a now-submerged prehistoric settlement south of Haifa.[10]

Olive trees and oil production in the Eastern Mediterranean can be traced to archives of the ancient city-state Ebla (2600–2240 BC), which were located on the outskirts of the Syrian city Aleppo. Here some dozen documents dated 2400 BC describe lands of the king and the queen. These belonged to a library of clay tablets perfectly preserved by having been baked in the fire that destroyed the palace. A later source is the frequent mentions of oil in the Tanakh.[11]

Dynastic Egyptians before 2000 BC imported olive oil from Crete, Syria and Canaan and oil was an important item of commerce and wealth. Remains of olive oil have been found in jugs over 4,000 years old in a tomb on the island of Naxos in the Aegean Sea. Sinuhe, the Egyptian exile who lived in northern Canaan about 1960 BC, wrote of abundant olive trees.[12] The Minoans used olive oil in religious ceremonies. The oil became a principal product of the Minoan civilization, where it is thought to have represented wealth.[citation needed]

Olive oil was also a major export of Mycenaean Greece (c. 1450–1150 BC).[13][6] Scholars believe the oil was made by a process where olives were placed in woven mats and squeezed. The oil collected in vats. This process was known from the Bronze Age and has been used by the Egyptians and continued to be used through the Hellenistic period.[6]

Olive crusher (trapetum) in Pompeii (79 AD)

The importance of olive oil as a commercial commodity increased after the Roman conquest of Egypt, Greece and Asia Minor led to more trade along the Mediterranean. Olive trees were planted throughout the entire Mediterranean basin during evolution of the Roman Republic and Empire. According to the historian Pliny the Elder, Italy had "excellent olive oil at reasonable prices" by the 1st century AD—"the best in the Mediterranean".[citation needed] As olive production expanded in the 5th century AD the Romans began to employ more sophisticated production techniques like the olive press and trapetum (pictured left).[6] Many ancient presses still exist in the Eastern Mediterranean region, and some dating to the Roman period are still in use today.[14] Productivity was greatly improved by Joseph Graham's development of the hydraulic pressing system developed in 1795.[6]

The Manufacture of Oil, 16th century engraving by Jost Amman

Symbolism and mythology

The olive tree has historically been a symbol of peace between nations. It has played a religious and social role in Greek mythology, especially concerning the name of the city of Athens where the city was named after the goddess Athena because her gift of an olive tree was held to be more precious than rival Poseidon's gift of a salt spring.[6]

Varieties

There are many olive cultivars, each with a particular flavor, texture, and shelf life that make them more or less suitable for different applications, such as direct human consumption on bread or in salads, indirect consumption in domestic cooking or catering, or industrial uses such as animal feed or engineering applications.[15] During the stages of maturity, olive fruit changes color from green to violet, and then black. Olive oil taste characteristics depend on which stage of ripeness olive fruits are collected.[15]

Uses

Vinegar and olive oil
Olives in olive oil

Culinary use

Olive oil is an important cooking oil in countries surrounding the Mediterranean, and it forms one of the three staple food plants of Mediterranean cuisine, the other two being wheat (as in pasta, bread, and couscous) and the grape, used as a dessert fruit and for wine.[16]

Extra virgin olive oil is mostly used as a salad dressing and as an ingredient in salad dressings. It is also used with foods to be eaten cold. If uncompromised by heat, the flavor is stronger. It also can be used for sautéing.

When extra virgin olive oil is heated above 210–216 °C (410–421 °F), depending on its free fatty acid content, the unrefined particles within the oil are burned. This leads to deteriorated taste. Also, most consumers do not like the pronounced taste of extra virgin olive oil for deep fried foods. Refined olive oils are suited for deep frying because of the higher smoke point and milder flavour.[17] Extra virgin oils have a smoke point around 180–215 °C (356–419 °F) whereas refined light olive oil has a smoke point up to 230 °C (446 °F).[18] "Contrary to popular myths, high quality EVOO [extra virgin olive oil] is an excellent choice for cooking. High quality EVOO has a smoke point well above the standard temperatures required for cooking, and its resistance to oxidation is higher than most cooking oils due to the antioxidant and mono-unsaturated fat content."[18] "The smoke point of a good extra-virgin olive oil is 210 °C (420 °F). The smoke point is higher in good extra-virgin olive oil and lower in low-quality virgin olive oil."[19]

Choosing a cold-pressed olive oil can be similar to selecting a wine. The flavor of these oils varies considerably and a particular oil may be more suited for a particular dish.

Fresh oil, as available in an oil-producing region, tastes noticeably different from the older oils available elsewhere. In time, oils deteriorate and become stale. One-year-old oil may be still pleasant to the taste, but it is less fragrant than fresh oil. After the first year, olive oil is more suitable for cooking than serving raw.

The taste of the olive oil is influenced by the varietals used to produce the oil and by the moment when the olives are harvested and ground (less ripe olives give more bitter and spicy flavors – riper olives give a sweeter sensation in the oil).

Religious use

Christianity

The Roman Catholic, Orthodox and Anglican churches use olive oil for the Oil of Catechumens (used to bless and strengthen those preparing for Baptism) and Oil of the Sick (used to confer the Sacrament of Anointing of the Sick or Unction). Olive oil mixed with a perfuming agent such as balsam is consecrated by bishops as Sacred Chrism, which is used to confer the sacrament of Confirmation (as a symbol of the strengthening of the Holy Spirit), in the rites of Baptism and the ordination of priests and bishops, in the consecration of altars and churches, and, traditionally, in the anointing of monarchs at their coronation.

Eastern Orthodox Christians still use oil lamps in their churches, home prayer corners and in the cemeteries. A vigil lamp consists of a votive glass containing a half-inch of water and filled the rest with olive oil. The glass has a metal holder that hangs from a bracket on the wall or sits on a table. A cork float with a lit wick floats on the oil. To douse the flame, the float is carefully pressed down into the oil. Makeshift oil lamps can easily be made by soaking a ball of cotton in olive oil and forming it into a peak. The peak is lit and then burns until all the oil is consumed, whereupon the rest of the cotton burns out. Olive oil is a usual offering to churches and cemeteries.

The Church of Jesus Christ of Latter-day Saints uses virgin olive oil that has been blessed by the priesthood. This consecrated oil is used for anointing the sick.[20]

Iglesia ni Cristo uses olive oil to anoint sick (in Filipino: "Pagpapahid ng Langis"), it is blessed by minister or deacon by prayer before anointing to the sick. After anointing, the Elder prays for Thanksgiving.

Judaism

In Jewish observance, olive oil was the only fuel allowed to be used in the seven-branched menorah in the Mishkan service during the Exodus of the tribes of Israel from Egypt, and later in the permanent Temple in Jerusalem. It was obtained by using only the first drop from a squeezed olive and was consecrated for use only in the Temple by the priests and stored in special containers. Although candles can be used to light the menorah at Hanukkah, oil containers are preferred, to imitate the original menorah. Another use of oil in Jewish religion was for anointing the kings of the Kingdom of Israel, originating from King David. Tzidkiyahu was the last anointed King of Israel.

Skin care

One study found that olive oil lowered the risk of dermatitis for infants in all gestational stages when compared with emollient cream,[21] while another study of adults found that topical treatment with olive oil "significantly damages the skin barrier" when compared to sunflower oil, and that it may make existing atopic dermatitis worse. The researchers concluded that due to the negative outcome in adults, they do not recommend the use of olive oil for the treatment of dry skin and infant massage.[22] Applying olive oil to the skin does not help prevent or reduce stretch marks.[23]

Other

Olive oil is also a natural and safe lubricant, and can be used to lubricate kitchen machinery (grinders, blenders, cookware, etc.). It can also be used for illumination (oil lamps) or as the base for soaps and detergents.[24] Some cosmetics also use olive oil as their base,[25] and it can be used as a substitute for machine oil.[26][27][28] Olive oil has also been used as both solvent and ligand in the synthesis of cadmium selenide quantum dots.[29]

The Ranieri Filo della Torre is an international literary prize for writings about extra virgin olive oil. It yearly honors poetry, fiction and non-fiction about extra virgin olive oil.

Extraction

A cold press olive oil machine in Israel.
Olive oil mill


Olive oil is produced by grinding olives and extracting the oil by mechanical or chemical means. Green olives usually produce more bitter oil, and overripe olives can produce oil that is rancid, so for good extra virgin olive oil care is taken to make sure the olives are perfectly ripened. The process is generally as follows:

  1. The olives are ground into paste using large millstones (traditional method) or steel drums (modern method).
  2. If ground with mill stones, the olive paste generally stays under the stones for 30 to 40 minutes. A shorter grinding process may result in a more raw paste that produces less oil and has a less ripe taste, a longer process may increase oxidation of the paste and reduce the flavor. After grinding, the olive paste is spread on fiber disks, which are stacked on top of each other in a column, then placed into the press. Pressure is then applied onto the column to separate the vegetal liquid from the paste. This liquid still contains a significant amount of water. Traditionally the oil was shed from the water by gravity (oil is less dense than water). This very slow separation process has been replaced by centrifugation, which is much faster and more thorough. The centrifuges have one exit for the (heavier) watery part and one for the oil. Olive oil should not contain significant traces of vegetal water as this accelerates the process of organic degeneration by microorganisms. The separation in smaller oil mills is not always perfect, thus sometimes a small watery deposit containing organic particles can be found at the bottom of oil bottles.
  3. In modern steel drum mills the grinding process takes about 20 minutes. After grinding, the paste is stirred slowly for another 20 to 30 minutes in a particular container (malaxation), where the microscopic oil drops aggregate into bigger drops, which facilitates the mechanical extraction. The paste is then pressed by centrifugation/ the water is thereafter separated from the oil in a second centrifugation as described before.
    The oil produced by only physical (mechanical) means as described above is called virgin oil. Extra virgin olive oil is virgin olive oil that satisfies specific high chemical and organoleptic criteria (low free acidity, no or very little organoleptic defects). A higher grade extra virgin olive oil is mostly dependent on favourable weather conditions; a drought during the flowering phase, for example, can result in a lower quality (virgin) oil. It is worth noting that olive trees produce well every couple of years, so greater harvests occur in alternate years (the year in-between is when the tree yields less). However the quality is still dependent on the weather.
  4. Sometimes the produced oil will be filtered to eliminate remaining solid particles that may reduce the shelf life of the product. Labels may indicate the fact that the oil has not been filtered, suggesting a different taste. Fresh unfiltered olive oil usually has a slightly cloudy appearance, and is therefore sometimes called cloudy olive oil. This form of olive oil used to be popular only among small scale producers but is now becoming "trendy", in line with consumer's demand for products that are perceived to be less processed. But generally, if not tasted or consumed soon after production, filtered olive oil should be preferred: "Some producers maintain that extra-virgin olive oils do not need filtration but also that filtration is detrimental to oil quality. This point of view should be considered as erroneous and probably the result of improper implementation of this operation. In fact, fine particles that are suspended in a virgin olive oil, even after the most effective centrifugal finishing, contain water and enzymes that may impair oil stability and ruin its sensory profile. [...] Filtration makes an extra-virgin olive oil more stable and also more attractive. If the suspended particles are not removed they slowly agglomerate and flocculate, forming a deposit on the bottom of the storage containers. Such a deposit continues to be at risk of enzymatic spoilage and, in the worst case, of development of anaerobic micro-organisms with further spoilage and hygienic risk. [...] It is [...] recommended that filtration be carried out as soon as possible after centrifugal separation and finishing."[30]

Pomace handling

The remaining semi-solid waste, called pomace, retains a small quantity (about 5–10%) of oil that cannot be extracted by further pressing, but only with chemical solvents. This is done in specialized chemical plants, not in the oil mills. The resulting oil is not "virgin" but "pomace oil".[31]

Handling of olive waste is an environmental challenge because the wastewater, which amounts to millions of tons (billions of liters) annually in the European Union, is not biodegradable, is toxic to plants, and cannot be processed through conventional water treatment systems.[31] Traditionally, olive pomace would be used as compost or developed as a possible biofuel, although these uses introduce concern due to chemicals present in the pomace.[31] A process called "valorization" of olive pomace is under research and development, consisting of additional processing to obtain value-added byproducts, such as animal feed, food additives for human products, and phenolic and fatty acid extracts for potential human use.[31]

Global market

Production

Virgin olive oil production – 2018/19
Country Production (tonnes)
 Spain 1,789,900
 Morocco 200,000
 Turkey 193,500
 Greece 185,000
 Italy 173,600
 Tunisia 140,000
 Portugal 100,300
 Syria 100,000
World
 3,217,500
Source: International Olive Council[32]
Potential distribution of the olive trees across the Mediterranean Basin[33]

In 2016/17, world production of virgin olive oil was 2,586,500 tonnes, an 18.6% decrease under 2015/16 global production.[32] Spain produced 1,290,600 tonnes or 50% of world production. The next six largest producers – Greece, Italy, Turkey, Morocco, Syria and Tunisia – collectively produced 70% of Spain's annual total.

In the EU, Eurostat reported in 2007 that there were 1.9 million farms with olive groves. The olive sector is characterised by a large number of small operations. The largest holdings are in Andalucía (8 ha/holding on average) in Spain and Alentejo (7.5 ha/holding) in Portugal while the smallest are located in Cyprus (0.5 ha/holding), Apulia and Crete (1.7 ha/holding).[34]

Some 75% of Spain's production derives from the region of Andalucía, particularly within Jaén province which produces 70% of olive oil in Spain.[35] The world's largest olive oil mill (almazara, in Spanish), capable of processing 2,500 tonnes of olives per day, is in the town of Villacarrillo, Jaén.[35]

In 2016/2017 Greece was the second largest producer of olive oil with 195,000 tons produced. As of 2009, there were 531,000 farms cultivating 730,000 hectares (1,800,000 acres) from 132 million trees producing 310–350,000 tons of olive oil.[36]

Italy produced 182,300 tonnes in 2016/17 or 7.6% of the world's production.[32] Even though the production can change from year to year, usually major Italian producers are the regions of Calabria and, above all, Apulia. Many PDO and PGI extra-virgin olive oil are produced in these regions. In Apulia, among the villages of Carovigno, Ostuni and Fasano is the Plain of Olive Trees, which counts some specimens as old as 3000 years; it has been proposed to add this plain to the UNESCO Heritage List.[37] Excellent extra-virgin olive oil is also produced in Tuscany,[38] in cities like Lucca, Florence, Siena which are also included in the association of "Città dell'Olio".[39] Italy imports about 65% of Spanish olive oil exports.[40] Some Italian companies are known to mix the imported olive oil with alternate oils (such as soy) and falsely market the blend as authentic olive oil "Made in Italy",[41][42][43] creating a fraud that the European Commission has attempted to overcome by offering a 5 million Euro reward to stimulate better methods of authentication.[44][45]

Turkey is the largest producer outside the EU (table), with 178,000 tons produced in 2016/2017, cultivating from 174.594 thousand trees.[46]

Tunisia is the fourth largest producer outside the EU (table), with 100,000 tons produced in 2016 to 2017, among which 73% was exported to Europe.[47] Because of the arid climate, pesticides and herbicides are largely unnecessary in Tunisia.[48]

While the majority (between 60–70%) of olive oil consumed in Australia is imported from Europe, a smaller domestic industry does exist. Many Australian producers only make premium small-batch oils, while a number of corporate growers operate groves of a million trees or more and produce oils for the general market. 11% of Australian production is exported, mostly to Asia.[49][50]

In North America, Italian and Spanish olive oils are the best-known, and top-quality extra virgin olive oil from Italy, Spain , Portugal and Greece are sold at high prices, often in prestige packaging. A large part of U.S. olive oil imports come from Italy, Spain, and Turkey.

The United States produces olive oil in California , Hawaii, Texas , Georgia, and Oregon.[51]

Global consumption

Greece has by far the largest per capita consumption of olive oil worldwide, over 24 liters (5.3 imp gal; 6.3 U.S. gal) per person per year;[52] Spain and Italy, around 14 l; Tunisia, Portugal, Syria, Jordan and Lebanon, around 8 l. Northern Europe and North America consume far less, around 0.7 l, but the consumption of olive oil outside its home territory has been rising steadily.

Regulation

The International Olive Council (IOC) is an intergovernmental organisation of states that produce olives or products derived from olives, such as olive oil. The IOC officially governs 95% of international production and holds great influence over the rest. The EU regulates the use of different protected designation of origin labels for olive oils.[53]

The United States is not a member of the IOC and is not subject to its authority, but on October 25, 2010, the U.S. Department of Agriculture adopted new voluntary olive oil grading standards that closely parallel those of the IOC, with some adjustments for the characteristics of olives grown in the U.S.[54] Additionally, U.S. Customs regulations on "country of origin" state that if a non-origin nation is shown on the label, then the real origin must be shown on the same side of the label and in comparable size letters so as not to mislead the consumer.[55][56] Yet most major U.S. brands continue to put "imported from Italy" on the front label in large letters and other origins on the back in very small print.[57] "In fact, olive oil labeled 'Italian' often comes from Turkey, Tunisia, Morocco, Spain, and Greece."[58] This makes it unclear what percentage of the olive oil is really of Italian origin.

Commercial grades

A bottle of Italian olive oil

All production begins by transforming the olive fruit into olive paste by crushing or pressing. This paste is then malaxed (slowly churned or mixed) to allow the microscopic oil droplets to agglomerate. The oil is then separated from the watery matter and fruit pulp with the use of a press (traditional method) or centrifugation (modern method). After extraction the remnant solid substance, called pomace, still contains a small quantity of oil.

To classify its organoleptic qualities, olive oil is judged by a panel of trained tasters in a blind taste test.

One parameter used to characterise an oil is its acidity.[59] In this context, "acidity" is not chemical acidity in the sense of pH, but the percent (measured by weight) of free oleic acid. Measured by quantitative analysis, acidity is a measure of the hydrolysis of the oil's triglycerides: as the oil degrades, more fatty acids are freed from the glycerides, increasing the level of free acidity and thereby increasing hydrolytic rancidity.[citation needed] Another measure of the oil's chemical degradation is the peroxide value,[60] which measures the degree to which the oil is oxidized by free radicals, leading to oxidative rancidity. Phenolic acids present in olive oil also add acidic sensory properties to aroma and flavor.[61]

The grades of oil extracted from the olive fruit can be classified as:

  • Virgin means the oil was produced by the use of mechanical means only, with no chemical treatment. The term virgin oil with reference to production method includes all grades of virgin olive oil, including Extra virgin, Virgin, Ordinary virgin and Lampante virgin olive oil products, depending on quality (see below).
  • Lampante virgin oil is olive oil extracted by virgin (mechanical) methods but not suitable for human consumption without further refining; “lampante” is the attributive form of “lampa”, the Italian word for “lamp”, referring to the earlier use of such oil in oil lamps. Lampante virgin oil can be used for industrial purposes, or refined (see below) to make it edible.[62]
  • Refined olive oil is the olive oil obtained from any grade of virgin olive oil by refining methods which do not lead to alterations in the initial glyceridic structure. The refining process removes colour, odour and flavour from the olive oil, and leaves behind a very pure form of olive oil that is tasteless, colourless and odourless and extremely low in free fatty acids. Olive oils sold as the grades Extra virgin olive oil and Virgin olive oil therefore cannot contain any refined oil.[62]
  • Crude olive pomace oil is the oil obtained by treating olive pomace (the leftover paste after the pressing of olives for virgin olive oils) with solvents or other physical treatments, to the exclusion of oils obtained by re-esterification processes and of any mixture with oils of other kinds. It is then further refined into Refined olive pomace oil and once re-blended with virgin olive oils for taste, is then known as Olive pomace oil.[62]
Italian label for "extra vergine" oil

International Olive Council

In countries that adhere to the standards of the International Olive Council,[63] as well as in Australia, and under the voluntary United States Department of Agriculture labeling standards in the United States:

Extra virgin olive oil is the highest grade of virgin oil derived by cold mechanical extraction without use of solvents or refining methods.[62][64] It contains no more than 0.8% free acidity, and is judged to have a superior taste, having some fruitiness and no defined sensory defects.[65] Extra virgin olive oil accounts for less than 10% of oil in many producing countries; the percentage is far higher in the Mediterranean countries (Greece: 80%, Italy: 65%, Spain 50%).[65]

Virgin olive oil is a lesser grade of virgin oil, with free acidity of up to 2.0%, and is judged to have a good taste, but may include some sensory defects.

Refined olive oil is virgin oil that has been refined using charcoal and other chemical and physical filters, methods which do not alter the glyceridic structure. It has a free acidity, expressed as oleic acid, of not more than 0.3 grams per 100 grams (0.3%) and its other characteristics correspond to those fixed for this category in this standard. It is obtained by refining virgin oils to eliminate high acidity or organoleptic defects. Oils labeled as Pure olive oil or Olive oil are primarily refined olive oil, with a small addition of virgin for taste.

Olive pomace oil is refined pomace olive oil, often blended with some virgin oil. It is fit for consumption, but may not be described simply as olive oil. It has a more neutral flavor than pure or virgin olive oil, making it unfashionable among connoisseurs; however, it has the same fat composition as regular olive oil, giving it the same health benefits. It also has a high smoke point, and thus is widely used in restaurants as well as home cooking in some countries.

United States

As the United States is not a member, the IOC retail grades have no legal meaning there, but on October 25, 2010, the United States Department of Agriculture (USDA) established Standards for Grades of Olive Oil and Olive-Pomace Oil, which closely parallel the IOC standards:[66][67]

  • U.S. Extra Virgin Olive Oil for oil with excellent flavor and odor and free fatty acid content of not more than 0.8 g per 100 g (0.8%);
  • U.S. Virgin Olive Oil for oil with reasonably good flavor and odor and free fatty acid content of not more than 2 g per 100 g (2%);
  • U.S. Virgin Olive Oil Not Fit For Human Consumption Without Further Processing is a virgin (mechanically-extracted) olive oil of poor flavor and odor, equivalent to the IOC's lampante oil;
  • U.S. Olive Oil is a mixture of virgin and refined oils;
  • U.S. Refined Olive Oil is an oil made from refined oils with some restrictions on the processing.

These grades are voluntary. Certification is available, for a fee, from the USDA.[67]

Several olive producer associations, such as the North American Olive Oil Association and the California Olive Oil Council, also offer grading and certification within the United States.[68] [69] Oleologist Nicholas Coleman suggests that the California Olive Oil Council certification is the most stringent of the voluntary grading schemes in the United States. [70]

Label wording

  • Different names for olive oil indicate the degree of processing the oil has undergone as well as the quality of the oil. Extra virgin olive oil is the highest grade available, followed by virgin olive oil. The word "virgin" indicates that the olives have been pressed to extract the oil; no heat or chemicals have been used during the extraction process, and the oil is pure and unrefined. Virgin olive oils contain the highest levels of polyphenols, antioxidants that have been linked with better health.[71]
  • Olive Oil, which is sometimes denoted as being "Made from refined and virgin olive oils" is a blend of refined olive oil with a virgin grade of olive oil.[62] Pure, Classic, Light and Extra-Light are terms introduced by manufacturers in countries that are non-traditional consumers of olive oil for these products to indicate both their composition of being only 100% olive oil, and also the varying strength of taste to consumers. Contrary to a common consumer belief, they do not have fewer calories than extra virgin oil as implied by the names.[72]
  • Cold pressed or Cold extraction means "that the oil was not heated over a certain temperature (usually 27 °C (80 °F)) during processing, thus retaining more nutrients and undergoing less degradation".[73] The difference between Cold Extraction and Cold Pressed is regulated in Europe, where the use of a centrifuge, the modern method of extraction for large quantities, must be labelled as Cold Extracted, while only a physically pressed olive oil may be labelled as Cold Pressed. In many parts of the world, such as Australia, producers using centrifugal extraction still label their products as Cold Pressed.
  • First cold pressed means "that the fruit of the olive was crushed exactly one time – i.e., the first press. The cold refers to the temperature range of the fruit at the time it is crushed".[74] In Calabria (Italy) the olives are collected in October. In regions like Tuscany or Liguria, the olives collected in November and ground, often at night, are too cold to be processed efficiently without heating. The paste is regularly heated above the environmental temperatures, which may be as low as 10–15 °C, to extract the oil efficiently with only physical means. Olives pressed in warm regions like Southern Italy or Northern Africa may be pressed at significantly higher temperatures although not heated. While it is important that the pressing temperatures be as low as possible (generally below 25 °C) there is no international reliable definition of "cold pressed".
    Furthermore, there is no "second" press of virgin oil, so the term "first press" means only that the oil was produced in a press vs. other possible methods.
  • Protected designation of origin (PDO) and protected geographical indication (PGI) refer to olive oils with "exceptional properties and quality derived from their place of origin as well as from the way of their production".[75]
  • The label may indicate that the oil was bottled or packed in a stated country. This does not necessarily mean that the oil was produced there. The origin of the oil may sometimes be marked elsewhere on the label; it may be a mixture of oils from more than one country.[57]
  • The U.S. Food and Drug Administration permitted a claim on olive oil labels stating: "Limited and not conclusive scientific evidence suggests that eating about two tablespoons (23 g) of olive oil daily may reduce the risk of coronary heart disease."[76]

Adulteration

There have been allegations, particularly in Italy and Spain, that regulation can be sometimes lax and corrupt.[77] Major shippers are claimed to routinely adulterate olive oil so that only about 40% of olive oil sold as "extra virgin" in Italy actually meets the specification.[78] In some cases, colza oil (extracted from rapeseed) with added color and flavor has been labeled and sold as olive oil.[79] This extensive fraud prompted the Italian government to mandate a new labeling law in 2007 for companies selling olive oil, under which every bottle of Italian olive oil would have to declare the farm and press on which it was produced, as well as display a precise breakdown of the oils used, for blended oils.[80] In February 2008, however, EU officials took issue with the new law, stating that under EU rules such labeling should be voluntary rather than compulsory.[79] Under EU rules, olive oil may be sold as Italian even if it only contains a small amount of Italian oil.[80]

Extra virgin olive oil has strict requirements and is checked for "sensory defects" that include: rancid, fusty, musty, winey (vinegary) and muddy sediment. These defects can occur for different reasons. The most common are:

  • Raw material (olives) infected or battered
  • Inadequate harvest, with contact between the olives and soil[81]

In March 2008, 400 Italian police officers conducted "Operation Golden Oil", arresting 23 people and confiscating 85 farms after an investigation revealed a large-scale scheme to relabel oils from other Mediterranean nations as Italian.[82] In April 2008, another operation impounded seven olive oil plants and arrested 40 people in nine provinces of northern and southern Italy for adding chlorophyll to sunflower and soybean oil, and selling it as extra virgin olive oil, both in Italy and abroad; 25,000 liters of the fake oil were seized and prevented from being exported.[83]

On March 15, 2011, the prosecutor's office in Florence, Italy, working in conjunction with the forestry department, indicted two managers and an officer of Carapelli, one of the brands of the Spanish company Grupo SOS (which recently changed its name to Deoleo). The charges involved falsified documents and food fraud. Carapelli lawyer Neri Pinucci said the company was not worried about the charges and that "the case is based on an irregularity in the documents."[84]

In February 2012, Spanish authorities investigated an international olive oil scam in which palm, avocado, sunflower and other cheaper oils were passed off as Italian olive oil. Police said the oils were blended in an industrial biodiesel plant and adulterated in a way to hide markers that would have revealed their true nature. The oils were not toxic and posed no health risk, according to a statement by the Guardia Civil. Nineteen people were arrested following the year-long joint probe by the police and Spanish tax authorities, part of what they call Operation Lucerna.[85]

Using tiny print to state the origin of blended oil is used as a legal loophole by manufacturers of adulterated and mixed olive oil.[86]

Journalist Tom Mueller has investigated crime and adulteration in the olive oil business, publishing the article "Slippery Business" in New Yorker magazine,[87] followed by the 2011 book Extra Virginity. On 3 January 2016 Bill Whitaker presented a program on CBS News including interviews with Mueller and with Italian authorities.[88][89] It was reported that in the previous month 5,000 tons of adulterated olive oil had been sold in Italy, and that organised crime was heavily involved—the term "Agrimafia" was used. The point was made by Mueller that the profit margin on adulterated olive oil was three times that on the illegal narcotic drug cocaine. He said that over 50% of olive oil sold in Italy was adulterated, as was 75–80% of that sold in the US. Whitaker reported that 3 samples of "extra virgin olive oil" had been bought in a US supermarket and tested; two of the three samples did not meet the required standard, and one of them—with a top-selling US brand—was exceptionally poor.

In early February 2017, the Carabinieri arrested 33 suspects in the Calabrian mafia's Piromalli 'ndrina ('Ndrangheta) which was allegedly exporting fake extra virgin olive oil to the U.S.; the product was actually inexpensive olive pomace oil fraudulently labeled.[90] Less than a year earlier, the American television program 60 Minutes had warned that "the olive oil business has been corrupted by the Mafia" and that "Agromafia" was a $16-billion per year enterprise. A Carabinieri investigator interviewed on the program said that "olive oil fraud has gone on for the better part of four millennia" but today, it's particularly "easy for the bad guys to either introduce adulterated olive oils or mix in lower quality olive oils with extra-virgin olive oil".[91] Weeks later, a report by Forbes stated that "it's reliably reported that 80% of the Italian olive oil on the market is fraudulent" and that "a massive olive oil scandal is being uncovered in Southern Italy (Puglia, Umbria and Campania)".[92]

Constituents

General chemical structure of olive oil (triglyceride). R1, R2 and R3 are alkyl groups (approx. 20%) or alkenyl groups (approx. 80%).

Olive oil is composed mainly of the mixed triglyceride esters of oleic acid, linoleic acid, palmitic acid and of other fatty acids,[93][94] along with traces of squalene (up to 0.7%) and sterols (about 0.2% phytosterol and tocosterols). The composition varies by cultivar, region, altitude, time of harvest, and extraction process.

Fatty acid Type Percentage ref.
Oleic acid Monounsaturated 55 to 83% [93]
Linoleic acid Polyunsaturated (omega-6) 3.5 to 21% [93][94]
Palmitic acid Saturated 7.5 to 20% [93]
Stearic acid Saturated 0.5 to 5% [93]
α-Linolenic acid Polyunsaturated (omega-3) 0 to 1.5% [93]

Phenolic composition

Olive oil contains traces of phenolics (about 0.5%), such as esters of tyrosol, hydroxytyrosol, oleocanthal and oleuropein,[61][95] which give extra virgin olive oil its bitter, pungent taste, and are also implicated in its aroma.[96] Olive oil is a source of at least 30 phenolic compounds, among which are elenolic acid, a marker for maturation of olives,[61][97] and alpha-tocopherol, one of the eight members of the Vitamin E family.[98] Oleuropein, together with other closely related compounds such as 10-hydroxyoleuropein, ligstroside and 10-hydroxyligstroside, are tyrosol esters of elenolic acid.

Other phenolic constituents include flavonoids, lignans and pinoresinol.[99][100]

Nutrition

Olive oil
Nutritional value per 100 g (3.5 oz)
Energy3,699 kJ (884 kcal)
0 g
100 g
Saturated14 g
Monounsaturated73 g
Polyunsaturated11 g
0.8 g
9.8 g
0 g
VitaminsQuantity %DV†
Vitamin E
93%
14 mg
Vitamin K
57%
60 μg
MineralsQuantity %DV†
Iron
4%
0.56 mg
Link to USDA Database entry
†Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database

One tablespoon of olive oil (13.5 g) contains the following nutritional information according to the USDA:[101]

  • Calories: 119
  • Fat: 13.5 g (21% of the Daily Value, DV)
  • Saturated fat: 2 g (9% of DV)
  • Carbohydrates: 0
  • Fibers: 0
  • Protein: 0
  • Vitamin E: 1.9 mg (10% of DV)
  • Vitamin K: 8.1 µg (10% of DV)

Comparison to other vegetable oils

Potential health effects

In the United States, the FDA allows producers of olive oil to place the following qualified health claim on product labels:[102][103]

Limited and not conclusive scientific evidence suggests that eating about 2 tbsp. (23 g) of olive oil daily may reduce the risk of coronary heart disease due to the monounsaturated fat in olive oil. To achieve this possible benefit, olive oil is to replace a similar amount of saturated fat and not increase the total number of calories you eat in a day.

In a review by the European Food Safety Authority (EFSA) in 2011, health claims on olive oil were approved for protection by its polyphenols against oxidation of blood lipids,[104] and for maintenance of normal blood LDL-cholesterol levels by replacing saturated fats in the diet with oleic acid.[105] (Commission Regulation (EU) 432/2012 of 16 May 2012).[106] Despite its approval, the EFSA has noted that a definitive cause-and-effect relationship has not been adequately established for consumption of olive oil and maintaining normal (fasting) blood concentrations of triglycerides, normal blood HDL-cholesterol concentrations, and normal blood glucose concentrations.[107]

A 2014 meta-analysis concluded that increased consumption of olive oil was associated with reduced risk of all-cause mortality, cardiovascular events and stroke, while monounsaturated fatty acids of mixed animal and plant origin showed no significant effects.[108] Another meta-analysis in 2018 found high-polyphenol olive oil intake was associated with improved measures of total cholesterol, HDL cholesterol, malondialdehyde, and oxidized LDL when compared to low-polyphenol olive oils.[109]

See also

  • Amurca
  • List of ancient dishes and foods
  • List of cuisines
  • List of dips

Notes

References

  1. ↑ Davidson, s.v. Olives
  2. ↑ "International Olive Council". http://www.internationaloliveoil.org/web/aa-ingles/oliveWorld/olivo.html. Retrieved October 5, 2011. 
  3. ↑ Thomas F. Scanlon (2005). "The Dispersion of Pederasty and the Athletic Revolution in sixth-century BC Greece", in Same-Sex Desire and Love in Greco-Roman Antiquity and in the Classical Tradition of the West, ed. B.C. Verstraete and V. Provençal, Harrington Park Press
  4. ↑ Nigel M. Kennell, "Most Necessary for the Bodies of Men: Olive Oil and its By-products in the Later Greek Gymnasium" in Mark Joyal (ed.), In Altum: Seventy-Five Years of Classical Studies in Newfoundland, 2001; popis pp. 119–133
  5. ↑ Himes, Norman E. (1963). The Medical History of Contraception. Gamut Press. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Kapellakis, Iosif Emmanouil (2008). "Olive oil history, production and by-product management". Reviews in Environmental Science Biotechology 7: 1–26. doi:10.1007/s11157-007-9120-9. 
  7. ↑ F.R. Riley, "Olive Oil Production on Bronze Age Crete: Nutritional properties, Processing methods, and Storage life of Minoan olive oil", Oxford Journal of Archaeology 21:1:63–75 (2002)
  8. ↑ Guillaume Besnarda, André Bervillé, "Multiple origins for Mediterranean olive (Olea europaea L. ssp. europaea) based upon mitochondrial DNA polymorphisms", Comptes Rendus de l'Académie des Sciences – Series III – Sciences de la Vie 323:2:173–181 (February 2000); Catherine Breton, Michel Tersac and André Bervillé, "Genetic diversity and gene flow between the wild olive (oleaster, Olea europaea L.) and the olive: several Plio-Pleistocene refuge zones in the Mediterranean basin suggested by simple sequence repeats analysis", Journal of Biogeography 33:11:1916 (November 2006)
  9. ↑ Ruth Schuster (17 December 2014). "8,000-year old olive oil found in Galilee, earliest known in world". Haaretz. https://www.haaretz.com/archaeology/.premium-8-000-year-old-olive-oil-found-in-galilee-1.5347955. Retrieved 17 December 2014. 
  10. ↑ Galili, Ehud; Stanley, Daniel Jean; Sharvit, Jacob; Weinstein-Evron, Mina (December 1997). "Evidence for Earliest Olive-Oil Production in Submerged Settlements off the Carmel Coast, Israel". Journal of Archaeological Science 24 (12): 1141–1150. doi:10.1006/jasc.1997.0193. 
  11. ↑ Nathaniel R. Brown (June 11, 2011). "By the Rivers of Babylon: The Near Eastern Background and Influence on the Power Structures Ancient Israel and Judah". history.ucsc.edu. http://history.ucsc.edu/undergraduate/undergraduate-research/electronic-journal/journal-pdfs/Brown_2011.pdf. Retrieved July 30, 2014. 
  12. ↑ Gardiner, Alan H. (1916). Notes on the Story of Sinuhe. Paris: Librairie Honoré Champion. http://www.reshafim.org.il/ad/egypt/texts/sinuhe.htm. 
  13. ↑ Castleden, Rodney (2005). The Mycenaeans. London and New York: Routledge. p. 107. ISBN 978-0-415-36336-5. https://books.google.com/books?id=Kfi0dAlfJaoC. "Huge quantities of olive oil were produced and it must have been a major source of wealth. The simple fact that southern Greece is far more suitable climatically for olive production may explain why the Mycenaean civilization made far greater advances in the south than in the north. The oil had a variety of uses, in cooking, as a dressing, as soap, as lamp oil, and as a base for manufacturing unguents." 
  14. ↑ J.M. Blásquez (1992). "The Latest Work on the Export of Baetican Olive Oil to Rome and the Army". ceipac.ub.edu. http://ceipac.ub.edu/biblio/Data/A/0134.pdf. Retrieved July 30, 2014. 
  15. ↑ 15.0 15.1 Nicole Sturzenberger (2007). "Olive Processing Waste Management: Summary". oliveoil.ucdavis.edu. http://oliveoil.ucdavis.edu/research/files/OliveOilWasteManagementtablenopatents.pdf. Retrieved July 30, 2014. 
  16. ↑ Essid, Mohamed Yassine (2012). Chapter 2. History of Mediterranean Food. Presses de Sciences Po. pp. 51–69. ISBN 978-2724612486. http://www.cairn.info/mediterra-2012-english--9782724612486-page-51.htm. 
  17. ↑ "Olive oil: Refined olive oils". https://www.accc.gov.au/consumers/groceries/olive-oil. 
  18. ↑ 18.0 18.1 Cite error: Invalid <ref> tag; no text was provided for refs named sgray
  19. ↑ Peri, Claudio, ed (2014). The extra virgin olive oil handbook. Chichester, West Sussex, UK: John Wiley & Sons, Ltd. pp. 356. ISBN 9781118460436. OCLC 861120215. 
  20. ↑ Oaks, Dallin H.. "Healing the Sick". https://www.churchofjesuschrist.org/study/general-conference/2010/04/healing-the-sick?lang=eng. 
  21. ↑ Kiechl-Kohlendorfer, U.; Berger, C.; Inzinger, R. (2008). "The Effect of Daily Treatment with an Olive Oil/Lanolin Emollient on Skin Integrity in Preterm Infants: A Randomized Controlled Trial". Pediatric Dermatology 25 (2): 174–178. doi:10.1111/j.1525-1470.2008.00627.x. PMID 18429773. 
  22. ↑ Danby, S.G.; Alenezi, T.; Sultan, A.; Lavender, T.; Chittock, J.; Brown, K.; Cork, M.J. (2013). "Effect of Olive and Sunflower Seed Oil on the Adult Skin Barrier: Implications for Neonatal Skin Care". Pediatric Dermatology 30 (1): 42–50. doi:10.1111/j.1525-1470.2012.01865.x. PMID 22995032. 
  23. ↑ "Clinical Inquiry: Do any topical agents help prevent or reduce stretch marks?". J Fam Pract 61 (12): 757–758. December 2012. PMID 23313995. 
  24. ↑ "Soap Making from Scratch Workshop". http://www.floridaconcerts.org/soap-making-the-old-way-with-wood-ash.htm. Retrieved November 23, 2013. 
  25. ↑ "The olive essence". http://www.esenciadeolivo.es/en/the-culture-of-the-olive-tree/products/. Retrieved November 23, 2013. 
  26. ↑ "Castile Olive Oil Soap, Spain, 2000 BCE". smith.edu. http://www.smith.edu/hsc/museum/ancient_inventions/hsc07b.htm. Retrieved July 30, 2014. 
  27. ↑ "Synthesis of Soap from Olive Oil". webpages.uidaho.edu. 2010. http://webpages.uidaho.edu/chem276/files/7%20-%20synthesis%20of%20soap.pdf. Retrieved July 30, 2014. 
  28. ↑ "California olive oil is worth the splurge". ucanr.edu (Division of Agriculture and Natural Resources). http://ucanr.edu/?story=79. Retrieved July 30, 2014. 
  29. ↑ Sameer Sapra; Andrey L. Rogach; Jochen Feldmann (2006). "Phosphine-free synthesis of monodisperse CdSe nanocrystals in olive oil". Journal of Materials Chemistry 16 (33): 3391–3395. doi:10.1039/B607022A. 
  30. ↑ Peri, Claudio, ed (2014). The extra-virgin olive oil handbook. Chichester, West Sussex, UK: John Wiley & Sons, Ltd. pp. 155–156. ISBN 9781118460450. OCLC 908158600. 
  31. ↑ 31.0 31.1 31.2 31.3 Berbel, Julio; Posadillo, Alejandro (17 January 2018). "Review and Analysis of Alternatives for the Valorisation of Agro-Industrial Olive Oil By-Products". Sustainability 10 (1): 237. doi:10.3390/su10010237. ISSN 2071-1050. 
  32. ↑ 32.0 32.1 32.2 "World Olive Oil Figures"
  33. ↑ "Better prediction of Mediterranean olive production using pollen-based models". Agronomy for Sustainable Development 34 (3): 685–694. 2014. doi:10.1007/s13593-013-0198-x. https://www.researchgate.net/publication/258291277. 
  34. ↑ "Economic Analysis of the Oil Sector". https://ec.europa.eu/agriculture/olive-oil/economic-analysis_en.pdf. Retrieved 30 October 2018. 
  35. ↑ 35.0 35.1 Lucy Vivante (2011). "Gruppo Pieralisi Powers World's Largest Olive Oil Mill in Jaén". Olive Oil Times. http://www.oliveoiltimes.com/olive-oil-business/europe/worlds-largest-olive-oil-mill-jaen/21330. Retrieved 9 November 2015. 
  36. ↑ "Olive oil production". Prosodol, International Olive Oil Council. 2009. http://www.prosodol.gr/?q=node/203. Retrieved 28 June 2018. 
  37. ↑ "Proposal to Include Apulia's 'Plain of Olive Trees' on Unesco List". Olive Oil Times. 2015-02-25. https://www.oliveoiltimes.com/olive-oil-basics/apulia-piana-degli-ulivi-unesco-list/46594. 
  38. ↑ "Tuscan Extra Virgin Olive Oil: A Product of Excellence" (in en). https://www.discovertuscany.com/typical-products-of-tuscany/the-tuscan-extra-virgin-olive-oil.html. 
  39. ↑ "Associazione Nazionale Città dell'Olio – Citta dell'olio". http://www.cittadellolio.it/citta-dell-olio/. 
  40. ↑ "La marca Italia se queda con el aceite español. Noticias de Economía" (in es). El Confidencial. https://www.elconfidencial.com/economia/2013-02-10/la-marca-italia-se-queda-con-el-aceite-espanol_252186/. 
  41. ↑ elEconomista.es. "Italia 'destapa' un fraude del aceite de oliva español vendido como italiano". http://www.eleconomista.es/empresas-finanzas/noticias/7325683/02/16/Italia-destapa-el-fraude-del-aceite-espanol-vendido-como-italiano.html. 
  42. ↑ "La estafa del aceite de oliva virgen italiano – Cocinillas" (in es-ES). Cocinillas. 2014-01-31. http://cocinillas.elespanol.com/2014/01/la-estafa-del-aceite-de-oliva-virgen-italiano/. 
  43. ↑ Blechman, Nicholas (2014). "Extra virgin Suicide" (in en-US). The New York Times. ISSN 0362-4331. https://www.nytimes.com/interactive/2014/01/24/opinion/food-chains-extra-virgin-suicide.html. 
  44. ↑ Commission, European. "Authentication of olive oil" (in en). http://ec.europa.eu/research/participants/portal/desktop/en/opportunities/h2020/topics/sfs-14a-2014.html. 
  45. ↑ "EU Offers €5m to Fight Olive Oil Fraud". Olive Oil Times. 2014-01-20. https://www.oliveoiltimes.com/olive-oil-business/europe/europe-offers-5-million-euros-to-fight-olive-oil-fraud/38168. 
  46. ↑ (in Turkish)"Zeytinyağı üretimi artışında zirve Türkiye'nin"
  47. ↑ Putinja, Isobel (10 July 2015). "Tunisian Olive Oil Exports Reach Record High". Olive Oil Times. https://www.oliveoiltimes.com/olive-oil-business/africa-middle-east/tunisian-olive-oil-exports-reach-record-high/48184. Retrieved 6 January 2018. 
  48. ↑ "Tunisia Seeks Renewal Through the Olive Tree". Olive Oil Times. February 15, 2018. https://www.oliveoiltimes.com/olive-oil-business/africa-middle-east/tunisia-seeks-renewal-olive-tree/62216. Retrieved 24 February 2018. 
  49. ↑ Sarah Schwager (August 31, 2010). "Australia Charts Five-Year Course for Olive Oil Industry". Olive Oil Times. http://www.oliveoiltimes.com/features/australia-olive-oil-industry/5971. 
  50. ↑ Margaret Chidgey (18 December 2017). "IOC flags big increase in consumption of Australian olive oil". The Olive Review. https://www.theolivereview.com.au/2017/12/latest-ioc-figures-are-good-news-for-the-australian-olive-industry/. Retrieved 18 May 2018. 
  51. ↑ Ramin, F. Martin (October 18, 2013). "The Best Olive Oils Made in the U.S.". Wall Street Journal. https://www.wsj.com/articles/olive-oil-the-new-american-gold-rush-1382129415. Retrieved May 22, 2014. 
  52. ↑ "Olive Oil Consumption". http://www.aboutoliveoil.org/olive_oil_world/consumption.html. Retrieved 10 July 2015. 
  53. ↑ "Olive Oil Times". http://www.oliveoiltimes.com/olive-oil-basics/olive-oil-varieties/pdo-pgi-tsg/2238. Retrieved September 13, 2014. 
  54. ↑ "New U.S. Olive Oil Standards in Effect Today". October 25, 2010. http://www.oliveoiltimes.com/olive-oil-basics/olive-oil-grades/usda-olive-oil-standards-begin/8087. Retrieved September 13, 2014. 
  55. ↑ Durant, John (September 5, 2000). "U.S. Customs Department, Director Commercial Rulings Division – Country of origin marking of imported olive oil; 19 CFR 134.46; "imported by" language". http://rulings.customs.gov/index.asp?ru=561712&qu=%22HQ+561712%22&vw=detail. 
  56. ↑ "Reference to HQ 560944 ruling of the Customs and Border Protection (CBP) on April 27, 1999 blending of Spanish olive oil with Italian olive oil in Italy does not result in a substantial transformation of the Spanish product". February 28, 2006. http://www.faqs.org/rulings/rulings2006HQ967925.html. 
  57. ↑ 57.0 57.1 McGee, Dennis. "Deceptive Olive Oil Labels on Major Brands (includes photos)". http://oliveoilonly.org/impurity/olive-oil-labels-false-labeling.htm. Retrieved November 9, 2008. 
  58. ↑ Raymond Francis (1998). "The Olive Oil Scandal". http://www.beyondhealth.com/c.1015947/site/articles/OliveOilScandal.pdf. 
  59. ↑ Grossi, Marco; Lecce, Giuseppe Di; Toschi, Tullia Gallina; Ricco, Bruno (September 2014). "Fast and Accurate Determination of Olive Oil Acidity by Electrochemical Impedance Spectroscopy". IEEE Sensors Journal 14 (9): 2947–2954. doi:10.1109/JSEN.2014.2321323. Bibcode: 2014ISenJ..14.2947G. https://hal.archives-ouvertes.fr/hal-01276347. 
  60. ↑ Grossi, Marco; Di Lecce, Giuseppe; Arru, Marco; Gallina Toschi, Tullia; Riccò, Bruno (February 2015). "An opto-electronic system for in-situ determination of peroxide value and total phenol content in olive oil". Journal of Food Engineering 146: 1–7. doi:10.1016/j.jfoodeng.2014.08.015. https://hal.archives-ouvertes.fr/hal-01276359. 
  61. ↑ 61.0 61.1 61.2 Bendini A, Cerretani L, Carrasco-Pancorbo A, Gómez-Caravaca AM, Segura-Carretero A, Fernández-Gutiérrez A, Lercker G (2007). "Phenolic molecules in virgin olive oils: a survey of their sensory properties, health effects, antioxidant activity and analytical methods. An overview of the last decade". Molecules 12 (8): 1679–1719. doi:10.3390/12081679. PMID 17960082. 
  62. ↑ 62.0 62.1 62.2 62.3 62.4 "The 101 of olive oil designations and definitions". Australian Olive Association. http://aooa.com.au/quality-standards/olive-oil-grading/. Retrieved March 15, 2015. 
  63. ↑ "Designations and definitions of olive oils". International Olive Council. http://www.internationaloliveoil.org/estaticos/view/83-designations-and-definitions-of-olive-oils. Retrieved December 1, 2012. 
  64. ↑ "What is extra virgin olive oil?". Olive Oil Times. 2018. https://www.oliveoiltimes.com/extra-virgin-olive-oil. Retrieved 8 February 2018. 
  65. ↑ 65.0 65.1 "Olive Oil Production". Prosodol. http://www.prosodol.gr/?q=node/203. Retrieved 27 November 2016. 
  66. ↑ "United States Standard for Grades of Olive Oil". United States Department of Agriculture. http://www.ams.usda.gov/grades-standards/olive-oil-and-olive-pomace-oil-grades-and-standards. Retrieved January 20, 2016. 
  67. ↑ 67.0 67.1 "United States Standard for Grades of Olive Oil". United States Department of Agriculture. http://www.ams.usda.gov/sites/default/files/media/Olive_Oil_and_Olive-Pomace_Oil_Standard%5B1%5D.pdf. Retrieved January 20, 2016. 
  68. ↑ NAOOA. "NAOOA Certified Quality Seal Program" (in en). https://www.aboutoliveoil.org/certified-olive-oil-list. 
  69. ↑ "Certification Process" (in en-US). https://www.cooc.com/certification-process/. 
  70. ↑ "What Makes Olive Oil Extra Virgin and Can I Trust the Label?" (in en-US). 2019-12-16. https://foodprint.org/blog/what-makes-olive-oil-extra-virgin-and-can-i-trust-the-label/. 
  71. ↑ "Bone density scan ... Olive oil ... Bursitis". Women's Health Advisor 14 (7): 8. 2010. 
  72. ↑ Deborah Bogle/Tom Mueller "Losing our Virginity" The Advertiser May 12, 2012 pp. 11–14
  73. ↑ Daniel Williams (9 September 2010). "Olive pomace oil: not what you might think". Olive Oil Times. https://www.oliveoiltimes.com/olive-oil-basics/olive-oil-grades/olive-pomace-oil/6210. 
  74. ↑ "California Olive Ranch". http://consumers.californiaoliveranch.com/frequently-asked-questions/what-does-first-cold-pressed-olive-olive-oil-really-mean/. Retrieved September 13, 2014. 
  75. ↑ "Error: no |title= specified when using {{Cite web}}" (in Greek). http://www.agrocert.gr/pages/Content.asp?cntID=26&catID=15. 
  76. ↑ Drummond, Linda, Sunday Telegraph (Australia), October 17, 2010 Sunday, Features; p. 10.
  77. ↑ "Report Scusi, Lei E' Vergine?". http://www.rai.it/dl/Report/puntata/ContentItem-17eecee5-475b-44cb-9839-0177ef27d2b0.html. 
  78. ↑ Tom Mueller (August 13, 2007). "Slippery Business". http://www.newyorker.com/reporting/2007/08/13/070813fa_fact_mueller. 
  79. ↑ 79.0 79.1 "EUbusiness.com". http://www.eubusiness.com/news-eu/1204304521.23/. 
  80. ↑ 80.0 80.1 Moore, Malcolm (May 7, 2007). "Murky Italian olive oil to be pored over". The Daily Telegraph (London). https://www.telegraph.co.uk/news/main.jhtml?xml=/news/2007/05/07/nfood07.xml. Retrieved May 20, 2010. 
  81. ↑ "草刈りは定期的に". Novaoliva.com. February 21, 2013. http://www.novaoliva.com/?page_id=222&lang=en. Retrieved May 21, 2013. 
  82. ↑ Moore, Malcolm (March 5, 2008). "Italian police crack down on olive oil fraud". The Daily Telegraph (London). https://www.telegraph.co.uk/news/main.jhtml?xml=/news/2008/03/05/witaly105.xml. Retrieved May 20, 2010. 
  83. ↑ Pisa, Nick (April 22, 2008). "Forty arrested in new 'fake' olive oil scam". The Scotsman (Edinburgh). http://news.scotsman.com/world/Forty-arrested-in-new-39fake39.4005000.jp. 
  84. ↑ "Investigations Into Deodorized Olive Oils". March 29, 2011. http://www.oliveoiltimes.com/olive-oil-business/details-expected-thursday-investigations-deodorized-olive-oils/14291. Retrieved September 13, 2014. 
  85. ↑ "Spanish Police Say Palm, Avocado, Sunflower Was Passed Off as Olive Oil". February 14, 2012. http://www.oliveoiltimes.com/olive-oil-business/europe/operation-lucerna-olive-oil-fraud/24815. 
  86. ↑ Nadeau, Barbie Latza (2015-11-14). "Has the Italian Mafia Sold You Fake Extra Virgin Olive Oil?". The Daily Beast. http://www.thedailybeast.com/articles/2015/11/14/has-the-italian-mafia-sold-you-fake-extra-virgin-olive-oil.html. 
  87. ↑ Mueller, Tom (August 13, 2007). "Slippery Business". The New Yorker. http://www.newyorker.com/magazine/2007/08/13/slippery-business. Retrieved 28 January 2016. 
  88. ↑ Whitaker, Bill. (3 January 2016). "Agromafia". 60 Minutes. Retrieved 3 January 2016. 10-minute video
  89. ↑ "Mafia Control of Olive Oil the Topic of '60 Minutes' Report". 3 January 2016. http://www.oliveoiltimes.com/olive-oil-basics/mafia-olive-oil-on-60-minutes/50203. Retrieved 28 January 2016. . Summary of CBS video
  90. ↑ Italy Arrests 33 Accused of Olive Oil Fraud 16 February 2017
  91. ↑ Don't fall victim to olive oil fraud 3 January 2016
  92. ↑ The Olive Oil Scam: If 80% Is Fake, Why Do You Keep Buying It? 10 February 2016
  93. ↑ 93.0 93.1 93.2 93.3 93.4 93.5 "Olive Oil : Chemical Characteristics". http://www.oliveoilsource.com/page/chemical-characteristics. 
  94. ↑ 94.0 94.1 Beltran (2004). Influence of Harvest Date and Crop Yield on the Fatty Acid Composition of Virgin Olive Oils from Cv. Picual. http://hera.ugr.es/doi/15058025.pdf. 
  95. ↑ "The phenolic compounds of olive oil: structure, biological activity and beneficial effects on human health". http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=608432&fulltextType=RA&fileId=S0954422405000089. Retrieved September 13, 2014. 
  96. ↑ Genovese A, Caporaso N, Villani V, Paduano A, Sacchi R (2015). "Olive oil phenolic compounds affect the release of aroma compounds". Food Chem 181: 284–294. doi:10.1016/j.foodchem.2015.02.097. PMID 25794752. 
  97. ↑ Lozano-Sánchez J, Castro-Puyana M, Mendiola JA, Segura-Carretero A, Cifuentes A, Ibáñez E (2014). "Recovering bioactive compounds from olive oil filter cake by advanced extraction techniques". Int J Mol Sci 15 (9): 16270–16283. doi:10.3390/ijms150916270. PMID 25226536. 
  98. ↑ "Gamma-tocopherol--an underestimated vitamin?". Annals of Nutrition & Metabolism 48 (3): 169–88. 2004. doi:10.1159/000079555. PMID 15256801. "In North America, the intake of γ-tocopherol has been estimated to exceed that of α-tocopherol by a factor of 2–4 ... due to the fact that soybean oil is the predominant vegetable oil in the American diet (76.4%) followed by corn oil and canola oil (both 7%) ... The supply of dietary fats ... is much more diverse in Europe ... The oils mainly consumed in Europe, i.e. sunflower, olive and canola oil, provide less γ-tocopherol but more α-tocopherol ... [T]he ratio of α-:γ-tocopherol is at least 1:2. Therefore, the average γ-tocopherol intake can be estimated as 4–6 mg/day, which is about 25–35% of the USA intake. In accordance with the lower estimated European intake of γ-tocopherol, the serum levels of γ-tocopherol in European populations are 4–20 times lower than that of α-tocopherol". 
  99. ↑ RW Owen, A Giacosa, WE Hull, R Haubner, B Spiegelhalder, H Bartsch (2000). "The antioxidant/anticancer potential of phenolic compounds isolated from olive oil". European Journal of Cancer 36 (10): 1235–1247. doi:10.1016/S0959-8049(00)00103-9. PMID 10882862. 
  100. ↑ RW Owen, W Mier, A Giacosa, WE Hull, B Spiegelhalder, H Bartsch (2000). "Identification of lignans as major components in the phenolic fraction of olive oil". Clinical Chemistry 46 (7): 976–988. doi:10.1093/clinchem/46.7.976. PMID 10894841. http://www.clinchem.org/content/46/7/976.full.pdf+html. 
  101. ↑ "NDL/FNIC Food Composition Database Home Page". Nal.usda.gov. http://www.nal.usda.gov/fnic/foodcomp/search/. Retrieved May 21, 2013. 
  102. ↑ "FDA Allows Qualified Health Claim to Decrease Risk of Coronary Heart Disease". US Food and Drug Administration. November 2004. https://www.fda.gov/newsevents/newsroom/pressannouncements/2004/ucm108368.htm. Retrieved 5 April 2013. 
  103. ↑ Brackett, RE (November 2004). "Letter Responding to Health Claim Petition dated August 28, 2003: Monounsaturated Fatty Acids from Olive Oil and Coronary Heart Disease (Docket No 2003Q-0559)". US Food and Drug Administration. https://www.fda.gov/Food/IngredientsPackagingLabeling/LabelingNutrition/ucm072963.htm. Retrieved April 5, 2013. 
  104. ↑ European Food Safety Authority (2011). "Scientific Opinion on the substantiation of health claims related to polyphenols in olive". EFSA Journal 9 (4): 2033. doi:10.2903/j.efsa.2011.2033. 
  105. ↑ European Food Safety Authority (2011). "Scientific Opinion on the substantiation of health claims related to oleic acid intended to replace saturated fatty acids (SFAs) in foods or diets". EFSA Journal 9 (4): 2043. doi:10.2903/j.efsa.2011.2043. 
  106. ↑ "Commission Regulation (EU) No 432/2012 of 16 May 2012 establishing a list of permitted health claims made on foods, other than those referring to the reduction of disease risk and to children's development and health. Text with EEA relevance". http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32012R0432. 
  107. ↑ Scientific Committee/Scientific Panel of the European Food Safety Authority (2011). "Scientific Opinion on the substantiation of health claims related to olive oil and maintenance of normal blood LDL-cholesterol concentrations (ID 1316, 1332), maintenance of normal (fasting) blood concentrations of triglycerides (ID 1316, 1332), maintenance of normal blood HDL cholesterol concentrations (ID 1316, 1332) and maintenance of normal blood glucose concentrations (ID 4244) pursuant to Article 13(1) of Regulation (EC) No 1924/2006". EFSA Journal 9 (4): 2044 [19 pp]. doi:10.2903/j.efsa.2011.2044. 
  108. ↑ Schwingshackl, L; Hoffmann, G (2014). "Monounsaturated fatty acids, olive oil and health status: A systematic review and meta-analysis of cohort studies". Lipids in Health and Disease 13: 154. doi:10.1186/1476-511X-13-154. PMID 25274026. 
  109. ↑ George, Elena S.; Marshall, Skye; Mayr, Hannah L.; Trakman, Gina L.; Tatucu-Babet, Oana A.; Lassemillante, Annie-Claude M.; Bramley, Andrea; Reddy, Anjana J. et al. (2018-04-30). "The effect of high-polyphenol extra virgin olive oil on cardiovascular risk factors: a systematic review and meta-analysis". Critical Reviews in Food Science and Nutrition 59 (17): 2772–2795. doi:10.1080/10408398.2018.1470491. ISSN 1549-7852. PMID 29708409. https://pure.bond.edu.au/ws/files/26952404/The_effect_of_high_polyphenol_extra_virgin_olive_oil_on_cardiovascular_risk_factors_a_syste.pdf. 

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