应用HPLC指纹图谱技术确定熟地黄炮制终点

目的:研究熟地黄炮制过程中HPLC指纹图谱的变化及确定炮制终点。方法:用HPLC指纹图谱技术检测生地黄炮制成熟地黄过程中主要活性成分梓醇、5-羟甲基糠醛(5-HMF)、麦角甾苷等及指纹的变化,并通过与标准熟地黄指纹图谱的比较寻找最佳加工时间。结果:在炮制过程中梓醇快速下降至几乎消失,5-HMF呈直线上升趋势,而麦角甾苷变化不明显,生地黄在蒸制26h后所制样品与标准熟地黄相似性最大,因此26h是熟地黄清蒸蒸制的最佳时间。结论:指纹图谱有利于显示样品成分变化及精确控制加工过程,可有效用于熟地黄加工过程中的质量控制。

End point determination by HPLC chromatographic fingerprint in processing prepared Rehmannia

To establish HPLC chromatographic fingerprints to control the quality of Chinese herbal medicine. In this study, fingerprints were established based on HPLC-DAD chromatographs. And with these fingerprints, content variations of three important active components catalpol, 5-hydroxymethylfurfural and acteoside in Rehmannia rhizome were analyzed during processing, as well as changes of the fingerprints. Fingerprints comparing with the standard prepared Rehmannia fingerprints which came from the mean of prepared ones randomly chosen for standard was done to seek optimal processing time. The results indicated that catalpol decreased quickly as braising prolonged and almost vanished in the end. While the active component of 5-HMF increased linearly throughout the process of braising. And the content of acteoside did not show obvious change. Similarity to standard prepared Rehmannia reached summit after braising for 26 hours. So 26 hours could be considered to be the optimum time for braising prepared Rrehmannia. Chromatographic fingerprint is convenient for revealing changes of constituents and for accurately controlling quality during processing prepared Rahmannia.