ABSTRACT
Objective: To establish an HPLC method for simultaneous determination of baicalein and wogonin in Baipuhuang tablets. Methods: HPLC was performed on an Agilent C 18 column(4.6 mm×250 mm, 5 μm)using the gradient acetoni trile(A)-water(B)at the 1.0 ml/min flow rate as mobile phase. The columm temperature was 30℃ and the detection wavelength was 280 nm. Results: The linear regression equation of baicalein was Y=24117X-223.95(r=0.9990);the linear range was 0.02~0.2 μg with the average recovery of 98.95% and the RSD of 0.64%(n=9). The linear regression equation of wogonin was Y=16237X-26.698(r=0.9996);the linear range was 0.02~0.2 μg with the average recovery of 99.28% and the RSD of 1.03%(n=9). The RSD values for the precision, stability and repeatability were all less than 2%. Conclusion: The established HPLC method appears to be highly sen sitive, accurate and reproducible, which could be used for the quality control of Baipuhuang tablets.