ABSTRACT
OBJECTIVE： To establish the method for simultaneous determination of ephedrine hydrochloride， pseudoephedrine hydrochloride， methamphetamine hydrochloride and paeoniflorin in Xiaoqinglong granule. METHODS： Micellar capillary electrophoresis （MCE） method was adopted. The optimum conditions for the separation were as follows as a fused silica capillary column as the separation channel， the buffer solution composed of 10 mmol/L borax-10 mmol/L SDS （95 ∶ 5， pH 10.5）， detection wavelength of 195 nm， separation voltage of 20 kV， capillary column temperature of 15 ℃，the sampling at a pressure for 0.5 psi×5 s. Two batches of Xiaoqinglong granules were collected from 2 manufacturers to determine the contents of ephedrine hydrochloride， pseudoephedrine hydrochloride， methamphetamine hydrochloride and paeoniflorin. The results of content determination were compared with the results determined by HPLC method stated in Chinese Pharmacopeia of 2015 edition. RESULTS： The linear range of ephedrine hydrochloride， pseudoephedrine hydrochloride， methamphetamine hydrochloride and paeoniflorin were 10-160， 10-160， 1-100， 10-500 μg/mL （r＝0.997 9-0.999 8）， respectively. RSDs of precision， reproducibility and stability tests were all ≤2.74％ （n＝5-6）. The average recoveries were 101.55％， 101.62％， 100.15％， 101.85％ （RSD≤3.94％， n＝6）， respectively. The contents of 4 components determined by micellar capillary electrophoresis were in accordance with the results of HPLC method. CONCLUSIONS： The established MCE method is simple， quick and sensitive， and can be used for simultaneous determination of 4 components mentioned above in Xiaoqinglong granule.