1 Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, China
2 Department of Technical Physics, Peking University, Beijing 100871, P.R. China
Abstract:
Pulse radiolysis of epicatechin in aqueous solution has been done to investigate the reactions of epicatechin derived phenoxy radical (EpO) at neutral pH. EpO was generated by N3 reacting toward EpOH, the rate constant was measured to be 3 × 108 dm3 mol−1 s−1. The biomolecular termination of EpO is rather slow ((2k < × 106 dm3 mol−1 s−1) and results in products exhibiting strong visible absorption around 450 nm. No reactions have been observed for EpO with O2 and O2 in the time scale of pulse radiolysis (0.01 s), suggesting the bimolecular rate constant are less than 104 and 5 × 106 dm3 mol−1 s−1, respectively.