富锌茶的锌浸出率及其饮用安全性研究

Study on Extracting Rate of Zinc and Drinking Safety of Zn-emiched Tea

本文对利用茶树的生物富集作用制得的富锌茶的锌浸出率、饮用的营养价值及安全性进行了分析研究,结果表明:富锌茶的锌浸出率为47.1%～51.1%,茶叶锌浸出率主要与加工方法等有关,而与锌含量无关;经粉碎加工的袋泡茶浸出率高于炒青。第一泡浸出的锌为两次浸泡锌总浸出量的80%左右,饮茶时一次冲泡即可获取茶叶中的大部分可浸出锌,通过饮用富锌茶可获取10%～15%的锌营养,并不会造成锌过量。利用生物转化生产富锌茶的农残及铅铜含量符合国家茶叶卫生标准。该富锌茶是一种安全有效的补锌饮料。

Extracting rate of zinc, drinking nutrition and safety of Zn-enriched tea made by use of the bioenrichment of tea plantwere studied.The results showed that zinc extracting rate of the zn-enriched tea were from 47.1% to 51.1%. The extracting rateof zinc in tea was mainly depended on the tea process,but no relation with zinc content of tea.Zinc extracted from the first infusingwas 80% of total extractable zinc in twice infusing tea .People could intake zinc nutrition in 10%～15% of RDA by drinking ofthe Zn-enriched tea which would not result to excessive intake of zinc. Zn-enriched tea made by use of the bioenriching effect oftea plant accorded to the national sanitary criteron of tea and it was a good and safe drinking for supplement of zinc nutrition.