OBJECTIVE:To develop an HPLC method for the determination of Baicalin in Xiaoyan Qingre capsules.METHODS:The separation of sample was performed on Thermo ODS-2 Hypersil(150 mm?4.6 mm,5 ?m).The mobile phase was methanol-0.1% phosphoric acid(43∶57).The detection wavelength was 277 nm,and the temperature of column was 30 ℃.RESULTS:The linear range of Baicalin was 0.217 8～3.267 0 ?g(r=0.999 9).The average recovery was 100.73%(RSD=2.23%,n=6).CONCLUSION:The method is sensitive,accurate,reproducible,and suitable for the qual-ity control of Xiaoyan qingre capsule.

Objective: To establish the quality standard for Jiujixingjun Power(Mentholum, Borneolum Syntheticum, Radix Scutellariae, Realgar, Cinnabaris, Brainia Insignis, Pericarpium Citri Reticulatae, etc.). Methods: Radix Scutellariae, Pericarpium Citri Reticulatae, Brainia Insignis, Mentholum and Borneolum Syntheticum in this medicine were identified by TLC and GC. The contents of Mentholum and Borneolum Syntheticum were determined by GC. Results: Radix Scutellariae and Pericarpium Citri Reticulatae and Brainia Insignis could be identified by TLC. Mentholum and Borneolum Syntheticum could be identified by GC. Its content was in the range of 75.69～78.51mg?g -1 and 61.26～ 64.14 mg?g -1 , respectively. The average recovery of Mentholum was 99.35%( RSD =0.98%) and Borneolum Syntheticum was 99.24%( RSD =0.98%). Conclusion: The method established is simple, feasible and reproducible and can be used as the quality standards for Jiujixingjun Powder.