Method: Gallocatechin, catechin and epicatechin are used as reference substances. Chromatographic assay is performed on a C_(18) colum. The mobile phase is composed of methanol and acetic acid solution with gradient elution.

• 方法:以没食子儿茶素(gallocatechin)；儿茶素(catechin)；表儿茶素(epicatechin)为对照品；反相C18柱；流动相甲醇-冰醋酸-水系统；梯度洗脱；流速0.；8mL