【摘要】 采用光谱法测定普洱茶中茶多酚的含量。方法的回收率为94%～105%,变异系数小于1.00%。用邻菲罗啉—Cu+—H2O2化学发光体系,结合流动注射技术研究普洱茶清除·OH的能力。实验结果表明,普洱茶中茶多酚的含量和清除·OH的能力,随着贮藏时间延长、贮藏温度提高而下降。更多还原

【Abstract】 Determination of catechin in puer teas by spectrophotometry method was described, the coefficient is 94%～105% and the efficient of variation is 1.00 %. The effect of puer teas on the scavenge of·OH was measured by the chemiluminescence system of 1,10-phenanthroline-cuprous chloride-hydrogen peroxide and flow-injection technology. The optimum conditions were investigated by examining the influence of various factors. The results show that the contents of catechin and scavenging ·OH radical in puer-tea were decreased with the increasing of time and temperature of storage.更多还原