ABSTRACT
Objective To develop an HPLC wavelength switching combined gradient elution method for simultaneous determi?nation of nine components in Kanglixin Jiaonang(KLXJN). Methods The analysis was performed on a Kromasil C18(4.6 mm×250 mm, 5μm)with gradient elution by using the mobile phase of acetonitrile-methanol(1:2)(A)-0.1%phosphoric acid solution(B). The col?umn temperature was maintained at 30℃and the flow rate was 0.9 ml/min. The detection wavelengths were set at 225 nm for costuno?lide(1)and dehydrocostus lactone(2),254 nm for aloe-emodin(3),rhein(4),emodin(5)and physcion(6),and 425 nm for bisde?methoxycurcumin(7),demethoxycurcumin(8)and curcumin(9). Results The calibration curves were linear within the range(μg/ml)of 6.610-132.2(r=0.9999)for 1,7.890-157.8(r=0.9996)for 2,14.07-281.4(r=0.9992)for 3,3.450-69.00(r=0.9997)for 4, 2.670-53.40(r=0.9998)for 5,3.760-75.20(r=0.9999)for 6,5.880-117.6(r=0.9996)for 7,8.490-169.8(r=0.9993)for 8,and 13.91-278.2(r=0.9991)for 9,respectively. The recoveries for 1,2,3,4,5,6,7,8 and 9 were 98.28%(RSD=1.09%),97.76%(RSD=0.80%),99.08%(RSD=1.72%),97.19%(RSD=1.00%),98.45%(RSD=1.24%),96.96%(RSD=1.21%),98.51%(RSD=1.55%), 97.52%(RSD=0.83%),and 100.04%(RSD=0.93%),respectively. Conclusion The established method is accurate,rapid and can be used for the quality control of KLXJN.