将离子液体1-丁基-3-甲基咪唑四氟硼酸盐([BMIM] BF4)作为流动相添加剂建立了同时测定复方苦参注射液中4种主要生物碱的HPLC分析方法.以Agilent TC-C18柱(250 mm×4.6 mm,5μm)为分离柱,甲醇-0.1%磷酸水溶液(含2.2×10-4 mol/L [BMIM]BF4)(5∶95,v/v)为流动相,流速1.0 mL/min,柱温30℃,进样量20μL,在205 nm下检测.结果表明,苦参碱、槐定碱、氧化槐果碱以及氧化苦参碱的质量浓度分别在25.8~155.0mg/L,40.0 ~ 240.0 mg/L,21.7 ~ 130.0 mg/L和37.5 ~ 225.0 mg/L范围内线性关系良好,相关系数均大于0.999 0,平均回收率(n=9)在96.2%和98.9%之间.离子液体的加入能明显改善C18柱分离生物碱的色谱峰形并提高分离度.本法简便、快速、重复性好,可用于复方苦参注射液中生物碱的分离与测定.
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