建立了高效液相色谱测定咖啡粉和速溶咖啡中葫芦巴碱含量的方法.采用Waters BondPak NH2色谱柱(250 mm×4.6 mm,5 μm),以甲醇-水(82∶18,v/v)为流动相,流速0.8 mL/min,检测波长260 nm.葫芦巴碱线性范围为1~40 mg/L (相关系数为 0.9998).分别进行日内、日间和人员比对测定葫芦巴碱的重复性试验及加标回收率试验.经测定,样品的加标回收率大于90%,相对标准偏差小于3%.比较了超声波萃取和热浸提萃取方法测定葫芦巴碱含量的差异,两个方法的测定结果符合线性关系,相关系数为0.9964.该法简便、快速、灵敏度高,适用于咖啡豆中葫芦巴碱分析以及咖啡豆原料与制品的质量控制.
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