title: Generation of the antioxidant yellow pigment derived from 4-methylthio-3-butenyl isothiocyanate in salted radish roots (takuan-zuke).
abstract: 2-[3-(2-Thioxopyrrolidin-3-ylidene)methyl]-tryptophan (TPMT) is a yellow pigment of salted radish roots (takuan-zuke) derived from 4-methylthio-3-butenyl isothiocyanate (MTBITC), the pungent component of radish roots. Here, we prepared salted radish and analyzed the behavior of the yellow pigment and related substances in the dehydration process and long-term salting process. All salted radish samples turned yellow, and their b(*) values increased with time and temperature. The salted radish that was sun-dried and pickled at room temperature turned the brightest yellow, and the generation of TPMT was clearly confirmed. These results indicate that tissue shrinkage due to dehydration, salting temperature, and pH play important roles in the yellowing of takuan-zuke.
authors.affiliation: a Higashinihon College of Nutrition and Pharmaceutical , Maebashi-shi , Japan.
authors.forename: Asaka
authors.initials: A
authors.lastname: Takahashi
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Yamada
authors.forename: Yohei
authors.initials: Y
authors.lastname: Uchiyama
authors.forename: Satomi
authors.initials: S
authors.lastname: Hayashi
authors.forename: Kei
authors.initials: K
authors.lastname: Kumakura
authors.forename: Hitoe
authors.initials: H
authors.lastname: Takahashi
authors.forename: Norihisa
authors.initials: N
authors.lastname: Kimura
authors.forename: Hiroki
authors.initials: H
authors.lastname: Matsuoka
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000378:metabolism; D017879:Isothiocyanates / Q000737:chemistry / Q000378:metabolism*; D010860:Pigments, Biological / Q000737:chemistry / Q000378:metabolism*; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism*; D031224:Raphanus / Q000737:chemistry / Q000378:metabolism*; D012965:Sodium Chloride / Q000737:chemistry / Q000494:pharmacology
chemical_list: C447639:4-(methylthio)-3-butenyl isothiocyanate; D000975:Antioxidants; D017879:Isothiocyanates; D010860:Pigments, Biological; D012965:Sodium Chloride
keywords: salted radish roots; takuan-zuke; tetrahydro-β-carboline derivative; yellow pigment