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6-Methoxymellein : ウィキペディア英語版 | 6-Methoxymellein
6-Methoxymellein is a dihydroisocoumarin, a phenolic compound found in carrots and carrot purées. It is responsible for bitterness in carrots.〔Structural and Sensory Characterization of Compounds Contributing to the Bitter Off-Taste of Carrots (Daucus carota L.) and Carrot Puree. Andreas Czepa and Thomas Hofmann, J. Agric. Food Chem., 2003, 51, pages 3865-3873, PMID 12797757〕〔Determination and Distribution of 6-Methoxymellein in Fresh and Processed Carrot Puree by a Rapid Spectrophotometric Assay. S.T. Talcott and L.R. Howard, J. Agric. Food Chem., 1999, 47 (8), pages 3237–3242, 〕 It is a phytoalexin, induced in carrot slices by UV-C,〔Induction of 6-Methoxymellein and Resistance to Storage Pathogens in Carrot Slices by UV-C. J. Mercier, J. Arul, R. Ponnampalam and M. Boulet, Journal of Phytopathology, Volume 137, Issue 1, pages 44–54, January 1993, 〕 that allows resistance to ''Botrytis cinerea''〔Cell death, 6-methoxymellein accumulation, and induced resistance to Botrytis cinerea in carrot root slices. R. Hoffman and J.B. Heale, Physiological and Molecular Plant Pathology, Volume 30, Issue 1, January 1987, Pages 67–75, 〕 and other microorganisms.〔Isolation and antimicrobial activity of the phytoalexin 6-methoxymellein from cultured carrot cells. Fumiya Kurosaki and Arasuke Nishi, Phytochemistry, Volume 22, Issue 3, 1983, Pages 669–672, 〕 == Biosynthesis == 6-Methoxymellein is formed from S-adenosyl methionine and 6-hydroxymellein by the enzyme 6-hydroxymellein O-methyltransferase with secondary production of S-adenosylhomocysteine.〔(6-methoxymellein biosynthesis pathway on www.biocyc.org )〕
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