Chemistry:Mustard oil

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Short description: Oil derived from mustard plants
Mustard oil and seeds

Mustard oil refers to either the pressed oil of the mustard plant used for cooking or its pungent essential (or volatile) oil.

Pressed mustard oil is used as cooking oil in many South Asian cusines; however, sale is restricted in some North American and European countries due to high levels of erucic acid, though some varieties have lower erucic acid content.

The essential oil is produced by grinding mustard seed, mixing the grounds with water, and isolating the resulting volatile oil by distillation. It can also be produced by dry distillation of the seed.

History

Mustard oil was likely produced in the ancient Jewish town of Huqoq, in modern-day Israel. This is suggested by distinctive agricultural features found there, such as semi-circular wine vats with steep slopes and lower troughs. Scholars believe these structures, dating to Roman or Byzantine times, were used to crush mustard pods to make oil. Mustard production in Huqoq is also documented in the Jerusalem Talmud.[1][2]

Pressed oil

Ox-powered mill grinding mustard seed for oil

Oil makes up about 30% of mustard seeds. It can be produced from black mustard (Brassica nigra), brown mustard (B. juncea), and white mustard (B. alba).

Culinary use

Having a distinctive pungent taste, the use of the oil is a feature of predominantly Assamese, Odia, Bengali, Nepalese[3] and North Indian cooking,[4][5] as well as Bangladeshi cuisine.[6] It is sometimes used as a substitute for ghee.[7]

Chemical composition

Its pungent flavor is due to allyl isothiocyanate, a phytochemical of plants in the mustard family, Brassicaceae (for example, cabbage, horseradish or wasabi).

Mustard oil has about 60% monounsaturated fatty acids (42% erucic acid and 12% oleic acid); it has about 21% polyunsaturated fats (6% the omega-3 alpha-linolenic acid and 15% the omega-6 linoleic acid), and it has about 12% saturated fats.[8]

Erucic acid in canola oil

Mustard oil can have up to 50% erucic acid[9] – a component of canola oil, which is deemed as a safe food ingredient for human consumption when the erucic acid level does not exceed 2% of the total fatty acids and the canola oil is pure.[10]

Regulation

The U.S. Food and Drug Administration prohibits the import or sale of expressed mustard oil in the U.S. for use in cooking due to its high erucic acid content. By contrast, the FDA classifies essential mustard oil, which has a much lower erucic acid content, as generally recognized as safe, and allows its use in food.[11][12] Expressed mustard oil is permitted in the U.S. as a massage oil, with a required "for external use only" label.[6]

Nutrition

Mustard oil (per 100 g) contains 884 calories of food energy and is 100% fat. The fat composition is 11% saturated fat, 59% monounsaturated fat, and 21% polyunsaturated fat.[8]

Essential oil

The pungency of the condiment mustard results when ground mustard seeds are mixed with water, vinegar, or other liquid (or even when chewed). Under these conditions, a chemical reaction between the enzyme myrosinase and a glucosinolate known as sinigrin from the seeds of black mustard (Brassica nigra) or brown Indian mustard (Brassica juncea) produces allyl isothiocyanate.[13] By distillation one can produce a very sharp-tasting essential oil, sometimes called volatile oil of mustard, containing more than 92% allyl isothiocyanate. The pungency of allyl isothiocyanate is due to the activation of the TRPA1 ion channel in sensory neurons. White mustard (Brassica hirta) does not yield allyl isothiocyanate, but the milder 4-Hydroxybenzyl isothiocyanate degraded from sinalbin rather than sinigrin.[14]

Allyl isothiocyanate serves the plant as a defense against herbivores. Since it is harmful to the plant,[15] it is stored in the harmless form of a glucosinolate, separate from the enzyme myrosinase. Once the herbivore chews the plant, the noxious allyl isothiocyanate is produced. Allyl isothiocyanate is also responsible for the pungent taste of horseradish and wasabi. It can be produced synthetically, sometimes known as synthetic mustard oil.[16]

See also


References

  1. ↑ Weingarten, Susan (2018). "Mustard in the Talmudic Literature". in McWilliams, Mark. Seeds: Proceedings of the Oxford Symposium on Food and Cookery 2018. Prospect Books. ISBN 9781909248656. 
  2. ↑ Grey, M. J., & Magness, J. (2013). Finding Samson in Byzantine Galilee: The 2011-2012 Archaeological Excavations at Huqoq. Studies in the Bible and Antiquity, 5(1), pp. 6–9
  3. ↑ "The heritage of mustard oil in Nepali cuisine" (in Nepali). https://theannapurnaexpress.com/story/46519/#:~:text=In%20traditional%20Newari%20cuisine,%20quick,cumin,%20garlic,%20and%20ginger.. 
  4. ↑ Krishnendu Ray, The Migrant's Table: Meals and Memories in Bengali-American Households (Temple University Press, 2004), p. 27: "Wide use of mustard brings Bengali food close to the North Indian paradigm"
  5. ↑ Pete Wells, Masalawala & Sons, Where the Food Is Bengali and the Mustard Oil Flow , New York Times (January 24, 2023): "The volatile, sinus-awakening aroma of mustard oil is one of the signatures of Bengali cooking. ... Many Bengali dishes are unthinkable without it."
  6. ↑ 6.0 6.1 Indrani Sen, American Chefs Discover Mustard Oil , New York Times (November 2, 2011): "It is also used as a massage oil, the only use for which it is legally approved in the United States."
  7. ↑ The Cook's Book of Ingredients (DK Publishing: 1st American ed., 2010), p. 513.
  8. ↑ 8.0 8.1 "Mustard oil (per 100 ml or g)". FoodData Central, US Department of Agriculture. 1 April 2019. https://fdc.nal.usda.gov/food-details/172337/nutrients. 
  9. ↑ Wendlinger, Christine; Hammann, Simon; Vetter, Walter (2014-06-15). "Various concentrations of erucic acid in mustard oil and mustard". Food Chemistry 153: 393–397. doi:10.1016/j.foodchem.2013.12.073. ISSN 0308-8146. https://www.sciencedirect.com/science/article/abs/pii/S0308814613019419. "[Mustard seed oil samples are] were bought retail in Germany (n = 6) and Australia (n = 3) [, but] the source of the mustard seed [samples] is unknown except for one [...] grown in Germany. [Mustard seed oil samples] purchased from German retail showed a greater variation including the lowest (0.3%) and highest (50.8%) contribution of erucic acid to the fatty acid pattern found within all samples [...] In the mustard samples, erucic acid contributed between 14% and 33% to the total [fatty acids.]". 
  10. ↑ "Rapeseed oil (section 184.1555)". US Food and Drug Administration, Code of Federal Regulations, Title 21. 23 September 1977. https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=184.1555. 
  11. ↑ FDA Import Alert 26-04: Detention Without Physical Examination of Expressed Mustard Oil , FDA (November 18, 2016).
  12. ↑ Mustard and Mustard Oil Safety , National Capital Poison Center] (last accessed January 26, 2023).
  13. ↑ Dai, Ruyan; Lim, Loong-Tak (2015-11-01). "Release of allyl isothiocyanate from mustard seed meal powder entrapped in electrospun PLA–PEO nonwovens". Food Research International 77: 467–475. doi:10.1016/j.foodres.2015.08.029. ISSN 0963-9969. https://www.sciencedirect.com/science/article/pii/S0963996915301630. 
  14. ↑ "Mustard". A Guide to Medicinal and Aromatic Plants. Center for New Crops and Plant Products, Purdue University. http://www.hort.purdue.edu/newcrop/med-aro/factsheets/MUSTARD.html. 
  15. ↑ Li, Yingbin; Lu, Daqing; Xia, Yan; Xu, Xinjing; Huang, Huichuan; Mei, Xinyue; Yang, Min; Li, Jianqiang et al. (2023-09-30). "Effects of allyl isothiocyanate fumigation on medicinal plant root knot disease control, plant survival, and the soil bacterial community". BMC Microbiology 23 (1): 278. doi:10.1186/s12866-023-02992-w. ISSN 1471-2180. PMID 37775764. "Allyl isothiocyanate (AITC) [...] has been used in agriculture because of its fungicidal [...] bactericidal, nematocidal [able to destroy nematodes], and herbicidal [able to destroy plants] biological activities.". 
  16. ↑ "Mustard Oil, Synthetic". JT Baker. http://hazard.com/msds/mf/baker/baker/files/p3225.htm. 



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