藤黄酸(gambogic acid,GA)等环氧杂蒽酮类化合物的水溶性差,可通过非水毛细管电泳(non-aqueous capillary electrophoresis,NACE)分析.本文系统地考察了添加20％ ～ 60％ (v/v)的甲醇或乙腈的运行电解质溶液对藤黄提取液中藤黄酸分离的影响.比较了不同的运行电解质溶液、运行电解质溶液浓度、pH、添加剂β-环糊精的浓度、分离温度及分离电压的影响,建立了测定藤黄药材中藤黄酸含量的非水毛细管电泳方法.在40％乙腈、l0mmol/Lβ-环糊精、20 mmol/L四硼酸钠(pH 9.86)为运行电解质溶液、分离电压为lo kV、分离温度为30℃、检测波长为280 nm的条件下进行测定.结果表明,藤黄酸在2～2000 mg/L范围内线性关系良好,相关系数为0.999 6,检出限(S/N=3)为2 mg/L.将本方法应用于越南、泰国、缅甸、印度4个产地的藤黄药材中藤黄酸的含量测定,测得含量为1.67 ～ 472.40 mg/g(相对标准偏差(RSD)为1.12％～2.60％),其中越南产藤黄中藤黄酸含量低,其他产地藤黄中藤黄酸的含量高.实际藤黄样品中藤黄酸的加标回收率为95.2％ ～ 105.6％.非水毛细管电泳方法简单、快速、重现性好,可用于藤黄药材中藤黄酸的含量测定.
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