Determination of S-Methylmethionine,Vitamin U,in Various Teas |
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| Authors: | Kozo Ohtsuki Makoto Kawabata Kuniko Taguchi Hiroshi Kokura Shinya Kawamura |
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| Affiliation: | Department of Food Science, Faculty of Living Science, Kyoto Prefectural University, Shimogamo, Kyoto 606, Japan |
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| Abstract: | S-Methylmethionine (MMS, an anti-ulcer factor, Vitamin u) was determined in the extracts of various kinds of teas, such as green teas, black teas and oolong teas, using an amino acid analyzer for physiological-fluid analysis or for rapid analysis. MMS in the column eluates was confirmed to be dimethyl sulfide by a gas-chromatographic method with a flame photometric detector. The quantity of MMS obtained from the various green teas depended on the quality and the freshness, i.e.fresh, high-quality gyokuro, 15.7 to 24.5 mg%; fresh sen-cha, 7.0 to 10.3 mg%; and the other green teas 1 to 6mg%. Oolong tea and black tea did not contain MMS.The extraction conditions for and the heat-stability of MMS were also discussed. |
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