标准摘要
[中文适用范围]： ISO 14502 的这一部分规定了一种高效液相色谱 (HPLC) 方法，用于根据单个儿茶素的总和来测定茶叶中儿茶素的总含量。 它适用于叶茶和速溶绿茶，并对红茶有精确限制（见附录 A）。 没食子酸和咖啡因以及茶没食子素和茶黄素也可以通过此方法测定。 [外文原描述]： ISO 14502-2:2005 specifies a high-performance liquid chromatographic (HPLC) method for the determination of the total catechin content of tea from the summation of the individual catechins. It is applicable to both leaf and instant green tea, and with precision limitations to black tea. Gallic acid and caffeine can also be determined by this method, as can theogallin and theaflavins.
英文名称Determination of substances characteristic of green and black tea — Part 2: Content of catechins in green tea — Method using high-performance liquid chromatography