摘要
研究了间接测定茶叶中茶多酚的原子吸收法。基于茶多酚与碱式乙酸铅发生络合反应,定量生成难溶于水的黄色沉淀,经离心后,用原子吸收法测定上清液中过量的铅离子,可间接测得茶多酚含量。其线性范围为3～25 μg/mL,RSD=1.3％。测定结果与经典滴定法基本一致。
A new indirect method for determining tea polyphenols by atomic absorption spectrometry is studied. The basis is tea polyphenols could react with Pb2+ and lead to yellow precipitate. The precipitate is centrifuged to subside. The Pb2+ in supernatant is determined by AAS,and the concentration of tea polyphenols is obtained. The linear region is 3-25 μg/mL,RSD=1. 3%. The results of official method and ours show no difference.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第6期683-685,共3页
Journal of Northwest University（Natural Science Edition）
基金
陕西省教委专项基金资助项目(2001JK073)
关键词
茶叶
茶多酚
间接原子吸收法
tea
tea polyphenols
atomic absorption spectrometry
