茶是世界上尤其是亚洲人广泛饮用的饮料。根据发酵程度不同,茶可以分成绿茶(非发酵)、乌龙茶(部分发酵)、红茶(完全发酵)。绿茶中的主要生物活性成分是茶多酚。茶多酚是一类存在于茶树中的多羟基酚类化合物,俗名茶单宁、茶鞣质。茶多酚的主要成分为黄烷醇类,通常称为儿茶素,占 Tea is a drink that is widely consumed in the world, especially among Asians. Depending on the degree of fermentation, tea can be divided into green tea (non-fermented), oolong (partially fermented), black tea (fully fermented). The main bioactive ingredient in green tea is tea polyphenols. Tea polyphenols is a class of polyhydroxy phenolic compounds found in the tea tree, commonly known as tea tannin, tea tannin. The main components of tea polyphenols flavanols, commonly known as catechins, accounting for