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利用高效液相色谱法对4种黄柏炮制品中盐酸小檗碱的含量进行了比较研究。结果表明，与生黄柏比较，盐黄柏和酒黄柏的盐酸小檗碱含量变化不大，而黄柏炭中小檗碱的含量损失殆尽。此方法的精密度和回收率均达到定量分析标准。
The content of berberine hydrochloride in four species of Chinese cedar processed products was compared by high performance liquid chromatography. The results showed that the content of berberine in the salt-white Phellodendron chinense and Phellodendron chinense changed little compared with that in Phellodendron chinense, but the content of berberine in the Phellodendron chinense was lost. The precision and recovery of this method all meet the quantitative analysis standards.