目的:建立同时测定大黄-黄连药材中5种蒽醌类成分含量的方法,并优选大黄-黄连药材质量比.方法:采用高效液相色谱法.色谱柱为Zorbax SB-C18(250 mm×4.6 mm,5μm),流动相为乙腈-0.05 mol/L磷酸二氢钾(48:52,V/V,每100 mL中加十二烷基硫酸钠0.4 g,磷酸调节pH至4.0),流速为1 mL/min,检测波长为254 nm,柱温为25℃,进样量为10μL.考察大黄-黄连药材质量比为1:1、1:2、2:1、2:3、3:2时配伍药材中芦荟大黄素、大黄酸、大黄素、大黄酚、大黄素甲醚的含量.结果:芦荟大黄素、大黄酸、大黄素、大黄酚、大黄素甲醚进样量分别在0.652~3.081、0.704~3.422、1.280~6.197、0.633~0.324、1.326~5.954μg范围内与各自峰面积积分值呈良好线性关系(r≥0.9997),精密度、稳定性、重复性试验的RSD均小于2.0%(n=6),平均加样回收率为98.92%~100.37%(RSD≤2.26%,n=6).大黄-黄连药材质量比为2:1时,5种蒽醌类成分总量最高.结论:本方法精密度、稳定性、重复性良好,可用于不同配伍比大黄-黄连药材的质量检定;大黄-黄连药材的最佳质量比为2:1.%OBJECTIVE:To establish a method for the simultaneous content determination 5 anthraquinones of rhei radix-copti-dis rhizoma,and optimize its best mass ratio. METHODS:HPLC was performed on the column of Zorbax SB-C18 (250 mm × 4.6 mm,5 μm)with mobile phase of acetonitrile-0.05 mol/L potassium dihydrogen phosphate(48:52, V/V,adding sodium dodecyl sulfate 0.4 g per 100 mL,pH value was adjusted to 4.0);detection wavelength was 254 nm;flow rate was 1 mL/min;column tem-perature was 25℃;and injection volume was 10μL. When mass ratio of rhei radix-coptidis rhizoma was 1:1,1:2,2:1,2:3,3:2,the contents of aloe emodin,rhein,emodin,chrysophanol and emodin ether were investigated. RESULTS:The aloe emodin, rhein, emodin, chrysophanol and emodin ether showed good linear relationship with peak area in the range of 0.652-3.081, 0.704-3.422,1.280-6.197,0.633-0.324,1.326-5.954 μg(r≥0.9997);RSDs of precision,stability,reproducibility tests were low-er than 2.0%(n=6);and average recovery was 98.92%-100.37%(RSD≤2.26%,n=6). When mass ratio was 2:1,the total contents of 5 ingredients were the highest. CONCLUSIONS:The method has good precision,stability,reproducibility,and can be used for the quality verification of rhei radix-coptidis rhizoma under different compatibilities. The best mass ratio of rhei radix-copti-dis rhizoma is 2:1.
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