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-“allyl isothiocyanate” (AITC) is a naturally occurring unsaturated [isothio-cyanate]-
The colorless oil is responsible for the pungent taste of cruciferous vegetables such as mustard, radish, horseradish, and wasabi
This pungency and the lachrymatory effect of AITC are mediated through the TRPA1 and TRPV1 ion channels.[1][2][3]
It is slightly soluble in water, but more soluble in most organic solvents.[4]
Biosynthesis and biological functions
[edit]
Allyl isothiocyanate can be obtained from the seeds of black mustard (Rhamphospermum nigrum) or brown Indian mustard (Brassica juncea)
When these mustard seeds are broken, the enzyme myrosinase is released and acts on a glucosinolate known as sinigrin to give allyl isothiocyanate.[5] This serves the plant as a defense against herbivores; since it is harmful to the plant itself,[citation needed] it is stored in the harmless form of the glucosinolate, separate from the myrosinase enzyme. When an animal chews the plant, the allyl isothiocyanate is released, repelling the animal. Human appreciation of the pungency is learned.[6]: 105
The compound has been shown to strongly repel fire ants (Solenopsis invicta).[7] AITC vapor is also used as an antimicrobial and shelf life extender in food packaging.[6]: 118–120
Production and applications
[edit]
Allyl isothiocyanate is produced commercially by the reaction of allyl chloride and potassium thiocyanate:[4]
CH2=CHCH2Cl + KSCN → CH2=CHCH2NCS + KCl
The product obtained in this fashion is sometimes known as synthetic mustard oil. Allyl thiocyanate isomerizes to the isothiocyanate:[8]
CH2=CHCH2SCN → CH2=CHCH2NCS
Allyl isothiocyanate can also be liberated by dry distillation of the seeds. The product obtained in this fashion is known as volatile oil of mustard.
It is used principally as a flavoring agent in foods. Synthetic allyl isothiocyanate is used as an insecticide, as an anti-mold agent [9] bacteriocide,[10] and nematicide, and is used in certain cases for crop protection.[4] It is also used in fire alarms for the deaf.[11][12]
Hydrolysis of allyl isothiocyanate gives allylamine.[13]
Allyl isothiocyanate has an LD50 of 151 mg/kg and is a lachrymator (similar to tear gas or mace).[4]
Based on in vitro experiments and animal models, allyl isothiocyanate exhibits many of the desirable attributes of a cancer chemopreventive agent.[14]
Mustard plaster, traditional home remedy
Piperine, the piquant chemical in black pepper
Capsaicin, the piquant chemical in chili peppers
Allicin, the piquant flavor chemical in raw garlic
^ Everaerts, W.; Gees, M.; Alpizar, Y. A.; Farre, R.; Leten, C.; Apetrei, A.; Dewachter, I.; van Leuven, F.; Vennekens, R. (2011). “The Capsaicin Receptor TRPV1 is a Crucial Mediator of the Noxious Effects of Mustard Oil”. Current Biology. 21 (4): 316–321. Bibcode:2011CBio…21..316E. doi:10.1016/j.cub.2011.01.031. PMID 21315593. S2CID 13151479.
^ Brône, B.; Peeters, P. J.; Marrannes, R.; Mercken, M.; Nuydens, R.; Meert, T.; Gijsen, H. J. (2008). “Tear gasses CN, CR, and CS are potent activators of the human TRPA1 receptor”. Toxicology and Applied Pharmacology. 231 (2): 150–156. Bibcode:2008ToxAP.231..150B. doi:10.1016/j.taap.2008.04.005. PMID 18501939.
^ Ryckmans, T.; Aubdool, A. A.; Bodkin, J. V.; Cox, P.; Brain, S. D.; Dupont, T.; Fairman, E.; Hashizume, Y.; Ishii, N.; et al. (2011). “Design and Pharmacological Evaluation of PF-4840154, a Non-Electrophilic Reference Agonist of the TrpA1 Channel”. Bioorganic & Medicinal Chemistry Letters. 21 (16): 4857–4859. doi:10.1016/j.bmcl.2011.06.035. PMID 21741838.
^ Jump up to: a b c d Romanowski, F.; Klenk, H. “Thiocyanates and Isothiocyanates, Organic”. Ullmann’s Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a26_749. ISBN 978-3-527-30673-2.
^ Blažević, Ivica; Montaut, Sabine; Burčul, Franko; Olsen, Carl Erik; Burow, Meike; Rollin, Patrick; Agerbirk, Niels (2020). “Glucosinolate structural diversity, identification, chemical synthesis and metabolism in plants”. Phytochemistry. 169: 112100. Bibcode:2020PChem.169k2100B. doi:10.1016/j.phytochem.2019.112100. PMID 31771793. S2CID 208318505.
^ Jump up to: a b Melton, Laurence, ed. (2019). The Encyclopedia of Food Chemistry. Netherlands: Elsevier. ISBN 978-0-12-814045-1.
^ Hashimoto, Yoshiaki; Yoshimura, Masashi; Huang, Rong-Nan (2019). “Wasabi versus red imported fire ants: Preliminary test of repellency of microencapsulated allyl isothiocyanate against Solenopsis invicta (Hymenoptera: Formicidae) using bait traps in Taiwan”. Applied Entomology and Zoology. 54 (2): 193–196. Bibcode:2019AppEZ..54..193H. doi:10.1007/s13355-019-00613-5.
^ Emergon, David W. (1971). “The Preparation and Isomerization of Allyl Thiocyanate. An Organic Chemistry Experiment”. Journal of Chemical Education. 48 (1): 81. Bibcode:1971JChEd..48…81E. doi:10.1021/ed048p81.
^ US Patent No. 8691042
^ Masuda, Shuichi; Masuda, Hideki; Shimamura, Yuko; Sugiyama, Chitose; Takabayashi, Fumiyo (April 2017). “Improvement Effects of Wasabi (Wasabia japonica) Leaves and Allyl Isothiocyanate on Stomach Lesions of Mongolian Gerbils Infected with Helicobacter pylori”. Natural Product Communications. 12 (4): 595–598. doi:10.1177/1934578X1701200431. PMID 30520603. S2CID 54567566.
^ US patent 20100308995A1, Hideaki Goto, Tomo Sakai, Koichiro Mizoguchi, Yukinobu Tajima, Makoto Imai, “Odor generation alarm and method for informing unusual situation”, issued 2015-06-24
^ Phillipson, Tacye (29 August 2018). “Why would you want a wasabai fire alarm?”. National Museums Scotland Blog. Retrieved 10 March 2022.
^ Leffler, M. T. (1938). “Allylamine”. Organic Syntheses. 18: 5; Collected Volumes, vol. 2, p. 24.
^ Zhang, Y (2010). “Allyl isothiocyanate as a cancer chemopreventive phytochemical”. Molecular Nutrition & Food Research. 54 (1): 127–35. doi:10.1002/mnfr.200900323. PMC 2814364. PMID 19960458.
en.wikipedia.org /wiki/Allyl_isothiocyanate
Allyl isothiocyanate
Contributors to Wikimedia projects7-9 minutes 3/6/2005
DOI: 10.1016/j.cub.2011.01.031, Show Details
From Wikipedia, the free encyclopedia
Allyl isothiocyanate
Allyl isothiocyanate
Allyl isothiocyanate
Space-filling model of allyl isothiocyanate
Space-filling model of allyl isothiocyanate
Names
Preferred IUPAC name
3-Isothiocyanatoprop-1-ene
Other names
Synthetic mustard oil
Identifiers
CAS Number
57-06-7 check
3D model (JSmol)
Interactive image
ChEBI
CHEBI:73224 ☒
ChEMBL
ChEMBL233248 check
ChemSpider
21105854 check
ECHA InfoCard 100.000.281 Edit this at Wikidata
EC Number
200-309-2
IUPHAR/BPS
2420
KEGG
D02818 check
C19317
PubChem CID
5971
RTECS number
NX8225000
UNII
BN34FX42G3 check
UN number 1545
CompTox Dashboard (EPA)
DTXSID3020047 Edit this at Wikidata
InChI
SMILES
Properties
Chemical formula
C4H5NS
Molar mass 99.15 g·mol−1
Density 1.013–1.020 g/cm3
Melting point −102 °C (−152 °F; 171 K)
Boiling point 148 to 154 °C (298 to 309 °F; 421 to 427 K)
Hazards
GHS labelling:
Pictograms
GHS02: FlammableGHS06: ToxicGHS07: Exclamation markGHS09: Environmental hazard
Signal word
Danger
Hazard statements
H226, H301, H310, H315, H319, H330, H335, H410
Precautionary statements
P210, P233, P240, P241, P242, P243, P260, P261, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P320, P321, P322, P330, P332+P313, P337+P313, P361, P362, P363, P370+P378, P391, P403+P233, P403+P235, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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