Quantitative Analysis of Yellow Pigment in Takuan-zuke and Their ABTS Radical Cation Scavenging Activity

publication · 8 years ago
by Asaka Takahashi, Hiroki Matsuoka, Emi Watanabe, Atsuko Shinagawa, Yoshio Ozawa, Yoichi Yamada, Yasushi Uda (Takasaki University of Health and Welfare)
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2-[3-(2-Thioxopyrrolidin-3-ylidene)methyl]-tryptophan (TPMT) is the main yellow pigment in salted radish roots (takuan-zuke). In the present study, we investigated the content of 1-(2-thioxopyrrolidin-3-yl)-1,2,3,4-tetrahydro-beta-carboline-3-carboxylic acid (TPCC) as a precursor of the yellow pigment and TPMT in commercial takuan-zuke. The total content of stereoisomers was 0.2-36.4 mg/100 g (2-364 ppm) for TPCC, and 0-6.6 mg/100 g (0-66 ppm) for TPMT. TPCC and TPMT showed radical scavenging activity against ABTS radical cation than the classical antioxidant (ascorbic acid and Trolox). The antioxidative activity showed no differences for TPCC stereoisomers, but showed differences for E/Z ratio-controlled TPMT solutions.
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