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Journal of Tea Science ›› 2012, Vol. 32 ›› Issue (2): 100-106.doi: 10.13305/j.cnki.jts.2012.02.003

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Analysis on the EGCG Methylated Derivatives Produced from EGCG Catalyzed by EGCG-O-Methyltransferase

Lü Hai-peng, FEI Dong-mei, ZHANG Yue, LIN Zhi*, TAN Jun-feng, GUO Li   

  1. National Engineering Research Center for Tea Processing, Key Laboratory of Processing and Quality Control of Tea and Beverage Plants, Ministry of Agriculture, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China
  • Received:2011-09-22 Revised:2011-11-07 Online:2012-04-15 Published:2019-09-05

Abstract: The fragmentation pathways of EGCG3′′Me, EGCG4′′Me and EGCG3′Me were studied using LC-MS under positive ionization mode, and the EGCG methylated derivatives produced from EGCG catalyzed by EGCG-O-Methyltransferase were analyzed. Results showed that more than ten kinds of EGCG methylated derivatives were identified, including EGCG3′′Me, EGCG4′′Me, EGCG3′Me, EGCG5′Me, EGCG3′′,4′′-diMe, EGCG3′′,5′′-diMe, EGCG3′,5′-diMe, EGCG3′,5′′-diMe, EGCG3′,3′′,5′′-triMe, EGCG5′,3′′,5′′-triMe.

Key words: EGCG methylated derivatives, mass fragmentation, EGCG-O-methyltransferase

CLC Number: