Simultaneous Determination Baicalin and Forsythin in Shuanghuanglian Oral Liquid by HPLC/DAD and LC‐ESI‐MS

Abstract

AbstractRapid, simple and reliable HPLC/DAD and LC‐ESI‐MS methods for the simultaneous determination of baicalin and forsythin in the traditional Chinese medicinal preparation Shuanghuanglian oral liquid were described and validated. The separation condition for HPLC/DAD was optimized using a BDS hypersil C18 column (Thermo, 2.1 × 150 mm, particle size 5 μm) by gradient elution using methanol‐0.2 % ammonium acetate as the mobile phase. The suitable detection wavelength was set at 277 nm for the quantitative analysis of baicalin and forsythin in this method. Some operational parameters of the ESI interface were optimized, negative m/z 445[M−H]− for baicalin and negative m/z 593[M+CH3COO]− for forsythin, positive m/z 447[M+H]+ for baicalin and positive m/z 552[M+NH 4]+ for forsythin, respectively. These HPLC/DAD and LC‐ESI‐MS methods were validated in terms of recovery, linearity, accuracy and precision (intra‐ and inter‐day validation). These methods can be used as a complementary method for the commercial quality control of Shuanghuanglian oral liquid and its pharmaceutical preparations.