Chemistry:Pectin

From HandWiki

Pectin (Ancient Greek: πηκτικός pēktikós: 'congealed' and 'curdled') is a heteropolysaccharide, a structural polymer contained in the cell walls and middle lamellae of terrestrial plants.[1] The principal chemical component of pectin is galacturonic acid (a sugar acid derived from galactose) which was isolated and described by Henri Braconnot in 1825.[2][3] Commercially produced pectin is a white-to-light-brown powder, produced from citrus fruits for use as an edible gelling agent, especially in jams and jellies, dessert fillings, medications, and sweets; as a food stabiliser in fruit juices and milk drinks;[4] and as a source of dietary fiber.

Biology

Natural occurrence

The peels of citrus fruits naturally contain large amounts of pectin.

Typical levels of pectin in fresh fruits and vegetables are:

  • Apples, 1–1.5%
  • Apricots, 1%
  • Cherries, 0.4%
  • Oranges, 0.5–3.5%
  • Carrots 1.4%
  • Citrus peels, 30%
  • Rose hips, 15%[5]

Pectin is composed of complex polysaccharides that are present in the primary cell walls of a plant, and are abundant in the green parts of terrestrial plants.[6] Pectin is the principal component of the middle lamella, where it binds cells. Pectin is deposited by exocytosis into the cell wall via vesicles produced in the Golgi apparatus.[7] The amount, structure and chemical composition of pectin is different among plants, within a plant over time, and in various parts of a plant. Pectin is an important cell wall polysaccharide that allows primary cell wall extension and plant growth.[8] During fruit ripening, pectin is broken down by the enzymes pectinase and pectinesterase, in which process the fruit becomes softer as the middle lamellae break down and cells become separated from each other.[9] A similar process of cell separation caused by the breakdown of pectin occurs in the abscission zone of the petioles of deciduous plants at leaf fall.

Human nutrition

In human digestion, pectin binds to cholesterol in the gastrointestinal tract and slows glucose absorption by trapping carbohydrates. Pectin is thus a soluble dietary fiber. In non-obese diabetic (NOD) mice pectin has been shown to increase the incidence of autoimmune type 1 diabetes.[10]

A study found that after consumption of fruit the concentration of methanol in the human body increased by as much as an order of magnitude due to the degradation of natural pectin (which is esterified with methanol) in the colon.[11]

Consumption of pectin has been shown to slightly (3–7%) reduce blood LDL cholesterol levels. The effect depends upon the source of pectin; apple and citrus pectins were more effective than orange pulp fibre pectin.[12] The mechanism appears to be an increase of viscosity in the intestinal tract, leading to a reduced absorption of cholesterol from bile or food.[13] In the large intestine and colon, microorganisms degrade pectin and liberate short-chain fatty acids that have a positive prebiotic effect.[14]

Other

Pectin has been observed to have some function in repairing the DNA of some types of plant seeds, usually desert plants.[15] Pectinaceous surface pellicles, which are rich in pectin, create a mucilage layer that holds in dew that helps the cell repair its DNA.[16]

Chemistry

Definition and structure

Pectin is a heteropolysaccharide with a high proportion of D-galacturonic acid (≈ 65 %) in its repeat units.[17] As the polymer’s main chain contains α-L-rhamnose in addition to galacturonic acid, the systematic name for pectin is rhamno-galacturonic acid. The incorporation of rhamnose units disrupts the otherwise linear poly(galacturonic acid) chain, introducing bends (or “kinks”). Many rhamnose units in pectin carry oligomeric side chains of neutral sugars such as arabinose, galactose, or xylose. These branched sections are referred to as “hairy” regions, while the unbranched stretches composed mainly of galacturonic acid are termed “smooth” regions. In further detail, the hairy and smooth regions can be divided into distinct structural domains (that exist within the same pectin molecule): Smooth regions comprise homogalacturonan (HG), xylogalacturonan (XGA), and apiogalacturonan (APGA), while the hairy regions are made up of rhamnogalacturonan I (RG-I) and rhamnogalacturonan II (RG-II).[18]

The carboxyl groups of polygalacturonic acid are frequently esterified with methanol or acetic acid. The degree of esterification and acetylation varies depending on the source of the pectin and has a decisive impact on its chemical properties. Pectins are therefore classified according to their degree of methylation (DM) and degree of acetylation (DA), which represent the ratio of esterified galacturonic acids (methylated or acetylated) to total galacturonic acids. Functionally, three types of pectins are distinguished:[19]

  • Pectic acids: degree of methylation less than 5% (DM<5)
  • Weakly methylated (LM) pectins: degree of methylation less than 50% (DM<50)
  • Highly methylated (HM) pectins: degree of methylation greater than 50% (DM>50)

Amidated pectin shows enhanced tolerance to varying calcium concentrations. Thiolated pectin, capable of forming disulfide crosslinks, exhibits superior gelling properties beneficial for pharmaceutical and food applications.

Structural features of various pectins
300x300px

Section of the pectin main chain:
Poly-α-(1→4)-galacturonic acid.

300x300px

Partially esterified section of the pectin main chain

300x300px

Rhamnogalacturonan: backbone with a “kink”
due to incorporated rhamnose

Structural domains

Pectin is often described as having alternating ‘smooth’ and ‘hairy’ regions, with the ‘hairy’ regions representing the branched rhamnogalacturonan I and rhamnogalacturonan II, and the ‘smooth’ regions corresponding to the linear homogalacturonan backbone.[20] More specifically, pectin consists of different galacturonic acid–containing domains—mainly homogalacturonan (HG), rhamnogalacturonan I (RG-I), and rhamnogalacturonan II (RG-II)—which differ in their sugar composition and linkage patterns. Additionally, xylogalacturonan (XGA) and apiogalacturonan (APGA) are often considered to be pectin because they have the same backbone as homogalacturonan.[18]

Homogalacturonan is a linear homopolymer of α-(1 → 4)-linked D-galacturonic acid residues that comprises ∼65 % of pectin.[21] Generally, homogalacturonan comprises D-galacturonic acid residues monomers in long stretches of at least 72 to 100 residues linked together.[18]

Rhamnogalacturonan I is a repeating disaccharide of [→4-α-D-GalA-(1 → 2)-α-L-Rha-(1→], i. e. an alternating copolymer of galacturonic acid and rhammnose, with many O-4 positions containing other neutral sugars, such as D-galactose or L-arabinose.[22] The length of the backbone of rhamnogalacturonan I is about 100 to 300 repeating units. Side chains varying by plant sources, such as arabinan, β-(1 → 4)-galactan, type I arabinogalactan (AG-I), and type II arabinogalactan (AG-II) exist. Arabinan consist of α-(1 → 5)-linked L-arabinose backbone, which is usually substituted with α-L-arabinose in different linkages. AG-I is composed out of a β-(1 → 4)-linked D-galactose backbone with α-L-arabinose residues attached to the O-3 position. The terminal galactose of β-(1 → 4) galactan is frequently linked to L-arabinose by α-(1 → 5) glycoside bonds. Type II arabinogalactan is composed of a β-(1 → 3)-linked D-Gal backbone, containing short side chains of α-L-Ara-(1 → 6)-[β-D-Gal-(1 → 6)]n. The galactosyl residues of the side chains can be substituted with α-(1 → 3)-linked L-arabinose residues.[23] Type II arabinogalactan is mainly associated with proteins (3–8 %), so called arabinogalactan proteins (AGPs), which are rich in proline/hydroxyproline, alanine, serine, and threonine.[24] D-galacturonic acid residues residues in the backbone of rhamnogalacturonan I may be highly O-acylated on O-2 and/or O-3, but they are not usually methyl esterified. Ferulic acid groups in rhamnogalacturonan I may be ester-linked to O-2 of the arabinose residues and to O-6 of the galactose residues.[18]

Another structural type of pectin is rhamnogalacturonan II (RG-II), which is a less frequent, complex, highly branched polysaccharide.[25] Rhamnogalacturonan II is classified by some authors within the group of substituted galacturonans since the rhamnogalacturonan II backbone is made exclusively of D-galacturonic acid units.[18]

Molecular weight

The molecular weight of isolated pectine greatly varies by the source and the method of isolation.[26] Values have been reported as low as 28 kDa for apple pomace[27] up to 753 kDa for sweet potato peels.[28]

Substitutions

In nature, around 80 percent of carboxyl groups of galacturonic acid are esterified with methanol. This proportion is decreased to a varying degree during pectin extraction. Pectins are classified as high- versus low-methoxy pectins (short HM-pectins versus LM-pectins), with more or less than half of all the galacturonic acid esterified.[29] The ratio of esterified to non-esterified galacturonic acid determines the behaviour of pectin in food applications – HM-pectins can form a gel under acidic conditions in the presence of high sugar concentrations, while LM-pectins form gels by interaction with divalent cations, particularly Ca2+, according to the idealized 'egg box' model, in which ionic bridges are formed between calcium ions and the ionised carboxyl groups of the galacturonic acid.[30][31][29]

The non-esterified galacturonic acid units can be either free acids (carboxyl groups) or salts with sodium, potassium, or calcium. The salts of partially esterified pectins are called pectinates, if the degree of esterification is below 5 percent the salts are called pectates, the insoluble acid form, pectic acid.[19]


Amidated pectin is a modified form of pectin. Here, some of the galacturonic acid is converted with ammonia to carboxylic acid amide. These pectins are more tolerant of varying calcium concentrations that occur in use.[32]

Thiolated pectin exhibits substantially improved gelling properties since this thiomer is able to crosslink via disulfide bond formation. These high gelling properties are advantageous for various pharmaceutical applications and applications in food industry.[33][34][35]


Gelation

Pectinase

Main article: Biology:Pectinase

Pectinase is a group of enzymes that break down pectin. Pectin contributes to cell adhesion and wall rigidity; pectinases thereby play a role in softening plant tissues when hydrolyzing the glycosidic bonds in pectin. Pectinase occurs naturally in many microorganisms, including bacteria and fungi, and is also produced by plants as part of normal growth, fruit ripening and plant decay processes.[18]

Industrially, pectinase is widely used in the food industry to clarify fruit juices and wines, enhance juice extraction, and improve the texture of fruit-based products. It is also applied in textile processing, paper production, and wastewater treatment due to its ability to break down plant-derived materials efficiently.

Production

The main raw materials for pectin production are dried citrus peels (85 %) or apple pomace (14 %), both by-products of juice production. Pomace from sugar beets is also used to a small extent (0.5 %).[36]

The conventional pectin production method uses hot acidified water extraction, followed by filtration, alcohol precipitation, washing, and drying. This process is robust and established at large scale, but requires significant amounts of mineral acid and organic solvents and may cause partial degradation of the polymer structure (protopectin loses some of its branching).

Alternative “green” extraction methods have been developed to address these limitations. Such approaches aim to improve yield and functionality while reducing chemical and energy inputs. Although many of these methods remain at laboratory or pilot scale, they are the subject of ongoing research into sustainable pectin production.[37]

Conventional solvent extraction method

Conventional pectin extraction from plant materials such as citrus peels and apple pomace involves the following steps:[38]

  • Pretreatment: washing, chopping, or drying the plant material to remove impurities and increase surface area.
  • Acid extraction: heating the material in dilute acid (usually mineral or organic) to solubilize the pectin.
  • Separation: removing solid residues by filtration or centrifugation.
  • Precipitation: adding alcohol (ethanol or isopropanol) to recover pectin from the solution.
  • Drying: collecting and drying the pectin to obtain a powder.
  • Optional modifications: adjusting the chemical properties (e.g., de-esterification) to achieve specific functional characteristics.

Green extraction methods

  • Enzyme-assisted extraction (EAE) — uses pectinases, cellulases or hemicellulases to release pectin at milder pH/temperature; can increase yield and preserve certain side chains, but enzyme selectivity matters. Often combined with ultrasound or microwaves.[39]
  • Ultrasound-assisted extraction (UAE) — cavitations support mass transfer; reduces time and temperature. Can be combined with enzymes (UA-EAE) or microwaves.[40]
  • Microwave-assisted extraction (MAE) and microwave-hydrothermal (MAHE) — fast heating, short extraction times; can give high yields but needs optimization to avoid degradation.[41]

Uses

The main use for pectin is as a gelling agent, thickening agent and stabiliser in food.[42]


The classical application is giving the jelly-like consistency to jams or marmalades, which would otherwise be sweet juices.[43] Pectin also reduces syneresis in jams and marmalades and increases the gel strength of low-calorie jams. For household use, pectin is an ingredient in gelling sugar (also known as "jam sugar") where it is diluted to the right concentration with sugar and some citric acid to adjust pH. For various food applications, different kinds of pectins can be distinguished by their properties, such as acidity, degree of esterification, relative number of methoxyl groups in the molecules, etc. For instance, the term "high methoxyl" refers to pectins that have a large proportion of the carboxyl groups in the pectin molecule that are esterified with methanol, compared to low methoxyl pectins:[43][44][45]

  • high methoxyl pectins are defined as those with a degree of esterification equal to or above 50, are typically used in traditional jam and jelly making;[46][47][42] such pectins require high sugar concentrations and acidic conditions to form gels, and provide a smooth texture and suitable to be used in bakery fillings and confectionery applications;[42][45][48]
  • low methoxyl pectins have a degree of esterification of less than 50,[45][42] can be either amidated or non-amidated: the percentage level of substitution of the amide group, defined as the degree of amidation, defines the efficacy of a pectin;[42] low methoxyl pectins can provide a range of textures and rheological properties, depending on the calcium concentration and the calcium reactivity of the pectin chosen[49]—amidated low methoxyl pectins are generally thermoreversible, meaning they can form gels that can melt and reform, whereas non-amidated low methoxyl pectins can form thermostable gels that withstand high temperatures;[49] these properties make low methoxyl pectins suitable for low sugar and sugar-free applications, dairy products, and stabilizing acidic protein drinks.[46][44][42]

For conventional jams and marmalades that contain above 60% sugar and soluble fruit solids, high-ester (high methoxyl) pectins are used. With low-ester (low methoxyl) pectins and amidated pectins, less sugar is needed, so that diet products can be made. Water extract of aiyu seeds is traditionally used in Taiwan to make aiyu jelly, where the extract gels without heating due to low-ester pectins from the seeds and the bivalent cations from the water.[29]

Pectin is used in confectionery jellies to give a good gel structure, a clean bite and to confer a good flavour release. Pectin can also be used to stabilise acidic protein drinks, such as drinking yogurt, to improve the mouth-feel and the pulp stability in juice based drinks and as a fat substitute in baked goods.[46][50]

Typical levels of pectin used as a food additive are between 0.5 and 1.0% – this is about the same amount of pectin as in fresh fruit.[51]

In medicine, pectin increases viscosity and volume of stool so that it is used against constipation and diarrhea. Until 2002, it was one of the main ingredients used in Kaopectate – a medication to combat diarrhea – along with kaolinite. It has been used in gentle heavy metal removal from biological systems.[52] Pectin is also used in throat lozenges as a demulcent.

Sriamornsak[53] revealed that pectin could be used in various oral drug delivery platforms, e.g., controlled release systems, gastro-retentive systems, colon-specific delivery systems and mucoadhesive delivery systems, according to its intoxicity and low cost. It was found that pectin from different sources provides different gelling abilities, due to variations in molecular size and chemical composition. Like other natural polymers, a major problem with pectin is inconsistency in reproducibility between samples, which may result in poor reproducibility in drug delivery characteristics.


Yablokov et al., writing in Chernobyl: Consequences of the Catastrophe for People and the Environment, quote research conducted by the Ukrainian Center of Radiation Medicine and the Belarusian Institute of Radiation Medicine and Endocrinology, concluded, regarding pectin's radioprotective effects, that "adding pectin preparations to the food of inhabitants of the Chernobyl-contaminated regions promotes an effective excretion of incorporated radionuclides" such as cesium-137. The authors reported on the positive results of using pectin food additive preparations in a number of clinical studies conducted on children in severely polluted areas, with up to 50% improvement over control groups.[54] During the Second World War, Allied pilots were provided with maps printed on silk, for navigation in escape and evasion efforts. The printing process at first proved nearly impossible because the several layers of ink immediately ran, blurring outlines and rendering place names illegible until the inventor of the maps, Clayton Hutton, mixed a little pectin with the ink and at once the pectin coagulated the ink and prevented it from running, allowing small topographic features to be clearly visible.[55]

At the Joint FAO/WHO Expert Committee Report on Food Additives and in the European Union, no numerical acceptable daily intake (ADI) has been set, as pectin is considered safe.[56]

The European Union (EU) has not set a daily intake limit for two types of pectin, known as E440(i) and Amidated Pectin E440(ii). The EU has established purity standards for these additives in the EU Commission Regulation (EU)/231/2012. Pectin can be used as needed in most food categories, a concept referred to as "quantum satis".[57] The European Food Safety Authority (EFSA) conducted a re-evaluation of Pectin E440(i) and Amidated Pectin E440(ii) in 2017. The EFSA concluded that the use of these food additives poses no safety concern for the general population. Furthermore, the agency stated that it is not necessary to establish a numerical value for the Acceptable Daily Intake (ADI).[58][59]


History

Pectin was first sold as a liquid extract, but is now most often used as dried powder, which is easier than a liquid to store and handle.[60]

See also

  • Fruit snacks

References

 This article incorporates text by Luna Barrera-Chamorro, África Fernandez-Prior, Fernando Rivero-Pino and Sergio Montserrat-de la Paz available under the CC BY 4.0 license.

  1. ↑ πηκτικός. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
  2. ↑ "Recherches sur un nouvel acide universellement répandu dans tous les vegetaux". Annales de chimie et de physique 28 (2): 173–178. 1825. https://books.google.com/books?id=1Zg5AAAAcAAJ&pg=PA173. Retrieved 8 January 2016. "From page 178: ... je propose le nom pectique, de πηχτες, coagulum, ... (I propose the name pectique, from πηχτες [pectes], coagulum [coagulated material, clot, curd])". 
  3. ↑ "Methane emissions from terrestrial plants under aerobic conditions". Nature 439 (7073): 187–191. January 2006. doi:10.1038/nature04420. PMID 16407949. Bibcode: 2006Natur.439..187K. 
  4. ↑ "Beverage Stabilizers". Food Product Design Magazine. 15 November 2000. https://www.foodingredientsonline.com/doc/beverage-stabilizers-0001. Retrieved 24 January 2023. 
  5. ↑ "Monograph: Rosae Pseudofrutus (Rose Hips)". Herbal Drugs and Phytopharmaceuticals: a handbook for practice on a scientific basis (3rd expanded and completely rev. ed.). Stuttgart : Boca Raton, FL: Medpharm; CRC Press. January 2004. p. 520. ISBN 978-0-8493-1961-7. https://books.google.com/books?id=7PRyMWo5e28C&dq=analysis+pectin+rose+hip+15%25&pg=PA520. Retrieved 14 March 2023. 
  6. ↑ "Fluorescence visualization of cellulose and pectin in the primary plant cell wall". Journal of Microscopy 278 (3): 164–181. June 2020. doi:10.1111/jmi.12895. PMID 32270489. 
  7. ↑ "My body is a cage: mechanisms and modulation of plant cell growth". The New Phytologist 201 (2): 388–402. January 2014. doi:10.1111/nph.12473. PMID 24033322. Bibcode: 2014NewPh.201..388B. 
  8. ↑ "Relating the mechanics of the primary plant cell wall to morphogenesis". Journal of Experimental Botany 67 (2): 449–461. January 2016. doi:10.1093/jxb/erv535. PMID 26689854. https://academic.oup.com/jxb/article-pdf/67/2/449/9366354/erv535.pdf. Retrieved 30 May 2020. 
  9. ↑ "Gene expression during tomato ripening". Philosophical Transactions of the Royal Society of London B 314 (1166): 399–410. 1986. doi:10.1098/rstb.1986.0061. Bibcode: 1986RSPTB.314..399G. 
  10. ↑ "Fermentable fibres condition colon microbiota and promote diabetogenesis in NOD mice". Diabetologia 57 (10): 2183–2192. October 2014. doi:10.1007/s00125-014-3325-6. PMID 25031069. 
  11. ↑ "Endogenous production of methanol after the consumption of fruit". Alcoholism: Clinical and Experimental Research 21 (5): 939–943. August 1997. doi:10.1111/j.1530-0277.1997.tb03862.x. PMID 9267548. 
  12. ↑ "Cholesterol-lowering properties of different pectin types in mildly hyper-cholesterolemic men and women". European Journal of Clinical Nutrition 66 (5): 591–599. May 2012. doi:10.1038/ejcn.2011.208. PMID 22190137. 
  13. ↑ "Chemistry of Pectin and its Pharmaceutical Uses: A Review". Silpakorn University International Journal 3 (1–2): 206. 2003. http://www.journal.su.ac.th/index.php/suij/article/viewFile/48/48. Retrieved 23 August 2007. 
  14. ↑ "Purification, characterization, and prebiotic properties of pectic oligosaccharides from orange peel wastes". Journal of Agricultural and Food Chemistry 62 (40): 9769–9782. October 2014. doi:10.1021/jf503475b. PMID 25207862. Bibcode: 2014JAFC...62.9769G. 
  15. ↑ "Value of the mucilaginous pellicle to seeds of the sand-stabilizing desert woody shrub Artemisia sphaerocephala (Asteraceae)". Trees 18 (6): 669–676. 30 July 2004. doi:10.1007/s00468-004-0349-4. Bibcode: 2004Trees..18..669H. 
  16. ↑ "Possible role of pectin-containing mucilage and dew in repairing embryo DNA of seeds adapted to desert conditions". Annals of Botany 101 (2): 277–283. January 2008. doi:10.1093/aob/mcm089. PMID 17495979. 
  17. ↑ Dranca, Florina; Oroian, Mircea (2018-11-01). "Extraction, purification and characterization of pectin from alternative sources with potential technological applications". Food Research International 113: 327–350. doi:10.1016/j.foodres.2018.06.065. ISSN 0963-9969. PMID 30195527. 
  18. ↑ 18.0 18.1 18.2 18.3 18.4 18.5 Barrera-Chamorro, Luna; Fernandez-Prior, África; Rivero-Pino, Fernando; Montserrat-de la Paz, Sergio (2025-01-15). "A comprehensive review on the functionality and biological relevance of pectin and the use in the food industry". Carbohydrate Polymers 348 (Pt A). doi:10.1016/j.carbpol.2024.122794. ISSN 0144-8617. PMID 39562070. 
  19. ↑ 19.0 19.1 Gawkowska, Diana; Cybulska, Justyna; Zdunek, Artur (2018-07-11). "Structure-Related Gelling of Pectins and Linking with Other Natural Compounds: A Review" (in en). Polymers 10 (7): 762. doi:10.3390/polym10070762. ISSN 2073-4360. PMID 30960687. 
  20. ↑ Pang, Yunrui; Peng, Zhigang; Ding, Kan (November 2024). "An in-depth review: Unraveling the extraction, structure, bio-functionalities, target molecules, and applications of pectic polysaccharides" (in en). Carbohydrate Polymers 343. doi:10.1016/j.carbpol.2024.122457. PMID 39174094. https://linkinghub.elsevier.com/retrieve/pii/S0144861724006830. 
  21. ↑ Du, Juan; Anderson, Charles T.; Xiao, Chaowen (2022-04-11). "Dynamics of pectic homogalacturonan in cellular morphogenesis and adhesion, wall integrity sensing and plant development" (in en). Nature Plants 8 (4): 332–340. doi:10.1038/s41477-022-01120-2. ISSN 2055-0278. PMID 35411046. Bibcode: 2022NatPl...8..332D. https://www.nature.com/articles/s41477-022-01120-2. 
  22. ↑ Wagstaff, Ben A.; Zorzoli, Azul; Dorfmueller, Helge C. (2021-02-26). "NDP-rhamnose biosynthesis and rhamnosyltransferases: building diverse glycoconjugates in nature" (in en). Biochemical Journal 478 (4): 685–701. doi:10.1042/BCJ20200505. ISSN 0264-6021. PMID 33599745. https://portlandpress.com/biochemj/article/478/4/685/227880/NDP-rhamnose-biosynthesis-and. 
  23. ↑ Kaczmarska, Adrianna; Pieczywek, Piotr M.; Cybulska, Justyna; Zdunek, Artur (February 2022). "Structure and functionality of Rhamnogalacturonan I in the cell wall and in solution: A review" (in en). Carbohydrate Polymers 278. doi:10.1016/j.carbpol.2021.118909. PMID 34973730. 
  24. ↑ Leszczuk, Agata; Kalaitzis, Panagiotis; Kulik, Joanna; Zdunek, Artur (2023-01-20). "Review: structure and modifications of arabinogalactan proteins (AGPs)" (in en). BMC Plant Biology 23 (1). doi:10.1186/s12870-023-04066-5. ISSN 1471-2229. PMID 36670377. Bibcode: 2023BMCPB..23...45L. 
  25. ↑ "Rhamnogalacturonan II". www.ccrc.uga.edu. http://www.ccrc.uga.edu/~mao/rg2/intro.htm. 
  26. ↑ "Review on functionalized pectin films for active food packaging". Packaging Technology and Science 37 (4): 237–262. 2024. doi:10.1002/pts.2793. 
  27. ↑ "Pectin extracted from apple pomace and citrus peel by subcritical water". Food Hydrocoll. 38: 129–137. 2014. doi:10.1016/J.FOODHYD.2013.12.003. 
  28. ↑ "Structural, physicochemical and emulsifying properties of sweet potato pectin treated by high hydrostatic pressure and/or pectinase: a comparative study". J Sci Food Agric 100 (13): 4911–4920. 2020. doi:10.1007/s11696-018-0500-0. PMID 32483850. 
  29. ↑ 29.0 29.1 29.2 "Extraction, characterization and spontaneous gel-forming property of pectin from creeping fig (Ficus pumila Linn.) seeds". Carbohydrate Polymers 87 (1): 76–83. January 2012. doi:10.1016/j.carbpol.2011.07.013. PMID 34663033. 
  30. ↑ "Calcium-induced gelation of low methoxy pectin solutions--thermodynamic and rheological considerations". International Journal of Biological Macromolecules 12 (1): 14–18. February 1990. doi:10.1016/0141-8130(90)90076-M. PMID 2083236. 
  31. ↑ "Compatibility analysis of pectin at different esterification degree from intrinsic viscosity data of diluted ternary solutions". Reactive and Functional Polymers 70 (10): 863–867. 2010. doi:10.1016/j.reactfunctpolym.2010.07.011. Bibcode: 2010RFPol..70..863M. 
  32. ↑ Food Chemistry. Berlin: Springer. April 2004. 
  33. ↑ "Pectin-cysteine conjugate: synthesis and in-vitro evaluation of its potential for drug delivery". The Journal of Pharmacy and Pharmacology 58 (12): 1601–1610. December 2006. doi:10.1211/jpp.58.12.0006. PMID 17331323. 
  34. ↑ "Hydrophobic thiolation of pectin with 4-aminothiophenol: synthesis and in vitro characterization". AAPS PharmSciTech 11 (1): 174–180. March 2010. doi:10.1208/s12249-009-9370-7. PMID 20101485. 
  35. ↑ "Compound treatment of thiolated citrus high-methoxyl pectin and sodium phosphate dibasic anhydrous improved gluten network structure". Food Chemistry 404 (Pt B). March 2023. doi:10.1016/j.foodchem.2022.134770. PMID 36332584. 
  36. ↑ Belkheiri, Anissa; Forouhar, Ali; Ursu, Alina Violeta; Dubessay, Pascal; Pierre, Guillaume; Delattre, Cedric; Djelveh, Gholamreza; Abdelkafi, Slim et al. (2021-07-18). "Extraction, Characterization, and Applications of Pectins from Plant By-Products" (in en). Applied Sciences 11 (14): 6596. doi:10.3390/app11146596. ISSN 2076-3417. 
  37. ↑ Riyamol; Gada Chengaiyan, Jeevitha; Rana, Sandeep Singh; Ahmad, Faraz; Haque, Shafiul; Capanoglu, Esra (2023-12-12). "Recent Advances in the Extraction of Pectin from Various Sources and Industrial Applications" (in en). ACS Omega 8 (49): 46309–46324. doi:10.1021/acsomega.3c04010. ISSN 2470-1343. PMID 38107881. 
  38. ↑ Chandel, Vinay; Biswas, Deblina; Roy, Swarup; Vaidya, Devina; Verma, Anil; Gupta, Anil (2022-09-02). "Current Advancements in Pectin: Extraction, Properties and Multifunctional Applications" (in en). Foods 11 (17): 2683. doi:10.3390/foods11172683. ISSN 2304-8158. PMID 36076865. 
  39. ↑ Bosch, Ryan; Malgas, Samkelo (December 2023). "Ultrasound-assisted enzymatic extraction of orange peel pectin and its characterisation" (in en). International Journal of Food Science & Technology 58 (12): 6784–6793. doi:10.1111/ijfs.16646. ISSN 0950-5423. https://academic.oup.com/ijfst/article/58/12/6784/7807186. 
  40. ↑ Lasunon, Patareeya; Sengkhamparn, Nipaporn (2022-02-09). "Effect of Ultrasound-Assisted, Microwave-Assisted and Ultrasound-Microwave-Assisted Extraction on Pectin Extraction from Industrial Tomato Waste" (in en). Molecules 27 (4): 1157. doi:10.3390/molecules27041157. ISSN 1420-3049. PMID 35208946. 
  41. ↑ Benmebarek, Imed E.; Gonzalez-Serrano, Diego J.; Aghababaei, Fatemeh; Ziogkas, Dimitrios; Garcia-Cruz, Rosario; Boukhari, Abbas; Moreno, Andres; Hadidi, Milad (October 2024). "Optimizing the microwave-assisted hydrothermal extraction of pectin from tangerine by-product and its physicochemical, structural, and functional properties" (in en). Food Chemistry: X 23. doi:10.1016/j.fochx.2024.101615. PMID 39669899. 
  42. ↑ 42.0 42.1 42.2 42.3 42.4 42.5 "What is Pectin (E440)? Sources, Types, Uses, and Benefits". 13 June 2020. https://foodadditives.net/thickeners/pectin/. 
  43. ↑ 43.0 43.1 "Pectin—Structure, Specification, Production, Applications and various Emerging Sources: A Review". Sustainable Food Systems (Volume II). World Sustainability Series. 2024. pp. 267–282. doi:10.1007/978-3-031-46046-3_13. ISBN 978-3-031-46045-6. 
  44. ↑ 44.0 44.1 Pectin: Technological and Physiological Properties. 2020. doi:10.1007/978-3-030-53421-9. ISBN 978-3-030-53420-2. 
  45. ↑ 45.0 45.1 45.2 "Pectins: Production, Properties and Applications". Renewable Resources for Functional Polymers and Biomaterials. 17 August 2011. pp. 210–260. doi:10.1039/9781849733519-00210. ISBN 978-1-84973-245-1. 
  46. ↑ 46.0 46.1 46.2 "UniPECTINE". https://www.cargill.com/doc/1432231523066/cargill-emea-unipectine-brochure.pdf. 
  47. ↑ "Biosynthesis, Localisation, and Function of Pectins in Plants". Pectin: Technological and Physiological Properties. 2 October 2020. pp. 1–15. doi:10.1007/978-3-030-53421-9_1. ISBN 978-3-030-53421-9. 
  48. ↑ "Biological Properties and Biomedical Applications of Pectin and Pectin-Based Composites: A Review". Molecules 28 (24): 7974. December 2023. doi:10.3390/molecules28247974. PMID 38138464. 
  49. ↑ 49.0 49.1 "Pectin Hydrogels: Gel-Forming Behaviors, Mechanisms, and Food Applications". Gels 9 (9): 732. September 2023. doi:10.3390/gels9090732. PMID 37754413. 
  50. ↑ "Industrial pectins: Sources, production and applications". Carbohydrate Polymers 12 (1): 79–99. 1990. doi:10.1016/0144-8617(90)90105-2. 
  51. ↑ "Chemistry and uses of pectin--a review". Critical Reviews in Food Science and Nutrition 37 (1): 47–73. February 1997. doi:10.1080/10408399709527767. PMID 9067088. 
  52. ↑ "The role of modified citrus pectin as an effective chelator of lead in children hospitalized with toxic lead levels". Alternative Therapies in Health and Medicine 14 (4): 34–38. 2008. PMID 18616067. 
  53. ↑ "Application of pectin in oral drug delivery". Expert Opinion on Drug Delivery 8 (8): 1009–1023. August 2011. doi:10.1517/17425247.2011.584867. PMID 21564000. 
  54. ↑ "13. Decorporation of Chernobyl radionuclides". Annals of the New York Academy of Sciences 1181 (1): 303–310. November 2009. doi:10.1111/j.1749-6632.2009.04838.x. ISBN 978-1-57331-757-3. PMID 20002057. Bibcode: 2009NYASA1181..303N. https://books.google.com/books?id=g34tNlYOB3AC&pg=PA304. 
  55. ↑ "history of wwii british cloth escape maps". http://www.escape-maps.com/escape_maps/history_of_wwii_british_cloth_escape_maps.htm#_edn24. 
  56. ↑ "Chemical Risks in Food". Who.int.. http://www.who.int/ipcs/food/jecfa/en/. Retrieved 16 July 2012. 
  57. ↑ "Commission Regulation (EU) No 1130/2011 of 11 November 2011 amending Annex III to Regulation (EC) No 1333/2008 of the European Parliament and of the Council on food additives by establishing a Union list of food additives approved for use in food additives, food enzymes, food flavourings and nutrients Text with EEA relevance". https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX:32011R1130. 
  58. ↑ "Re-evaluation of pectin (E 440i) and amidated pectin (E 440ii) as food additives". EFSA Journal 15 (7): e04866. 6 July 2017. doi:10.2903/j.efsa.2017.4866. PMID 32625540. PMC 7010145. https://www.efsa.europa.eu/en/efsajournal/pub/4866. Retrieved 7 April 2024. 
  59. ↑ EFSA Panel on Food Additives and Flavourings (FAF) (29 January 2021). "Opinion on the re-evaluation of pectin (E 440i) and amidated pectin (E 440ii) as food additives in foods for infants below 16 weeks of age and follow-up of their re-evaluation as food additives for uses in foods for all population groups | EFSA". EFSA Journal 19 (1): e06387. doi:10.2903/j.efsa.2021.6387. PMID 33537069. PMC 7845505. https://www.efsa.europa.eu/en/efsajournal/pub/6387. Retrieved 7 April 2024. 
  60. ↑ "International Pectin Producers Association". http://www.ippa.info. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Chemistry:Pectin&oldid=4032694"