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Reactions of tea polyphenol four constituents with hydroxyl radical: A pulse radiolytic study

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Abstract

Using the electron pulse radiolytic techniques, the reactions between hydroxyl radical and tea polyphenol four constituents epigallocatechin gallate (EGCG), epicatechin gallate (ECG), epigallocatechin (EGC) and epicatechin (EC) have been investigated in detail, their corresponding rate constants for scavenging hydroxyl radicals have been determined to be 1.5 × 1010, 1.4 × 1010, 9.7 × 109and 9.2 x 109 dm3-mol−1-s−1, respectively. On the basis of their structures and transient absorption spectra, the OH adducts of EGCG and ECG undergo unimolecular elimination of gallate group.

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Authors and Affiliations

  1. Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, 201800, Shanghai, China

    Yue Jiang, Side Yao, Weizhen Lin & Nianyun Lin

  2. Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 200031, Shanghai, China

    Dayuan Zhu

Authors
  1. Yue Jiang
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  2. Side Yao
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  3. Weizhen Lin
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  4. Nianyun Lin
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  5. Dayuan Zhu
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Project supported by the National Natural Science Foundation of China (Grant No. 39130050)

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Jiang, Y., Yao, S., Lin, W. et al. Reactions of tea polyphenol four constituents with hydroxyl radical: A pulse radiolytic study. Sc. China Ser. B-Chem. 41, 295–300 (1998). https://doi.org/10.1007/BF02879710

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  • DOI: https://doi.org/10.1007/BF02879710

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