黄连黄柏提取液中3种生物碱的原位生成离子液体微萃取及HPLC测定

通过加入水溶性离子液体C6MIM]Br]和离子对试剂NaPF6在黄连和黄柏的提取液中，原位生成非水溶性离子液体C6MIM]PF6]萃取其生物碱，离心分相后，用HPLC测离子液体相中的生物碱小檗碱、巴马汀和黄连碱，其线性相关系数分别为0.9998、0.9996和0.9997，线性范围为1~2000 μg/L，检出限皆为0.5 μg/L，加标回收率96.52%~104.34%。 这种方法可用于黄连和黄柏中的小檗碱、巴马汀和黄连碱的检测。

HPLC Determination of Three Alkaloids in Rhizoma coptidis and Cortex phellodend Microextracted with in situ Formed Ionic Liquids

NaPF6 (as an ion-pairing agent) was added to the extraction solution of Rhizoma coptidis and Cortex phellodend containing C6MIM]Br](as hydrophilic ionic liquid(IL)). A cloudy solution formed as a result of the formation of fine droplets of C6MIM]PF6]. After centrifugation, the sedimented phase enriched with alkaloids was analyzed by HPLC with UV detection. In this method, several important parameters, such as the type and volume of ILs, the amount of NaPF6, solution pH, extraction time and centrifugation time, influencing the extraction efficiency of IL-ISFME(in situ solvent formation microextraction) were optimized. Under optimal conditions, berberine, palmatine and coptisine exhibit good linearity, with correlation coefficients of 0.9998, 0.9996 and 0.9997, respectively, a linear range of 1~2000 μg/L and the detection limit of 0.5 μg/L. The spiked recovery for each analyte is in the range of 96.52%~104.34%. The experimental results indicate that the proposed method is successfully applied to the analysis of three alkaloids in Rhizoma coptidis and Cortex phellodend.