ABSTRACT
AIM:To establish a capillary electrophoresis with field-amplified sample stacking method for the separation and determination of aconitine alkaloid in Xiaohuoluo Pills. METHODS: An uncoated fused-silica capi-llary column(50 ?m i.d.?43 cm,effective length 35 cm) was used.The running buffer was 60 mmol/L phosphate electrolyte solution(pH=6.0)-acetonitrile(8(∶)2).The ruuning voltage was 10 kV and the capillary inlet was dipped in water for 5 s with 3.5 kPa prior to electrokinetic injection(12 kV,30 s).The detection wavelength was 235 nm. RESULTS: This method allowed 400 fold enrichment of aconitine alkaloid.A good linear relation was obtained in the range of 37.5～2.4?10~3 ng/mL (r=0.999 5),with the detection limit of 9.4 ng/mL.The average recovery was 97.6% with the RSD of 1.9%. CONCLUSION: The method is simple,rapid,specific and selective with high stacking efficiency;it provides a new reliable means for production and quality control of Xiaohuoluo Pills.