...物在长期自然选择中产生的一些次级代谢物，它们是一类以2-苯基色原酮（C6-C3-C6）为母核的多酚化合物（polyphenolic compounds）．在发挥抗肿瘤活性时，均有A环与受体的负电荷中心结合，C环与受体的正电荷中心结合，其他部位通过氢键与受体发生作用的共性。
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tea polyphenolic compounds 茶多酚类化合物
OBJECTIVE: To study the anticarcinogenic mechanism of polyphenolic compounds in tea.
目的：探讨儿茶素类化合物的抗癌作用机制。
When bombarded with ultraviolet rays from the sun, the lettuce leaf creates UV-absorbing polyphenolic compounds in its outer layer of cells.
当来自太阳的紫外线轰击到莴笋时，莴笋叶子就会在外层细胞创造吸收紫外线的多酚类物质。
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。
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