Thus, it might be concluded that blocking effect on NPRO formation was mainly due to tea polyphenolic compounds especially tea catechin in tea.
由此可以认为，茶叶中影响N -亚硝化反应的主要成分为茶多酚，尤为茶儿茶素。
Tea leaves are extraordinarily rich sources of a group of compounds known as polyphenolic substances, which account for almost one-third of the weight of dried leaf.
茶叶是一组称为多酚物质的化合物的非常丰富来源，这类物质几乎占了干茶叶重量的三分之一。
If water boils when it is in contact with tea leaves, a high proportion of polyphenolic compounds are extracted. These make the hot beverage excessively astringent.
如果与茶叶接触时水是沸腾的，就会提取出高比例的多酚化合物，使得这种热饮料过分涩口。
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