目的：研究儿茶及儿茶提取物的质量标准。
AIM: To study the quality standard on catechu and its extract.
采用紫外分光光度法测定儿茶及儿茶提取物中活性鞣质的含量。
UV spectrophotometry was applied to determine the contents of active tannic acid in catechu and its extract.
方法用狗肾传代MDCK细胞培养法观察儿茶提取物抑制甲型流感病毒的致细胞病变作用；
Methods The inhibitory cytopathic effects (CPE) of catechu extract on influenza A virus were observed by MDCK cell culture techniques.
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