筛选出Hypersil BDS C18和Zorbax SB C18两种适合同时分离茶叶和茶多酚中7种儿茶素和咖啡因的反相柱.采用甲醇-水-醋酸(或三氟醋酸)作流动相, 分别以等强度洗脱和梯度洗脱(均在30 min内)分离测定了我国6种不同产地茶叶样品和3种茶多酚样品中7种儿茶素的含量.考察了7种儿茶素和咖啡因的保留值与流动相组成及柱温的关系,优化了色谱条件及样品前处理方法.用电喷雾电离质谱(ESI-MS)定性确认没食子儿茶素没食子酸酯(GCG)和儿茶素没食子酸酯(CG)两组分,并用高效液相色谱制备两对照品用于定量分析.
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