基于中药多糖结构的复杂性和特征性,针对多糖部分降解后的寡糖片段,建立了一种采用毛细管区带电泳法(CZE)分离分析中药寡糖,并利用其特征性电泳谱图信息,结合聚类分析(CA)进行中药鉴定的方法.该方法以1-苯基-3-甲基-5-吡唑啉酮(PMP)为寡糖柱前衍生化试剂,对3个科属的6种中药如黄精、玉竹等同时进行鉴定.采用的电泳条件:未涂层熔融石英毛细管柱(49 cm(有效长度40 cm)×50μm),以50 mmol/L磷酸盐缓冲液(pH2.5)为运行缓冲液,检测波长为245 nm,运行电压为15 kV,虹吸进样10 cm×4 s,柱温为室温.结果表明聚类分析辅助中药寡糖电泳分析法可有效用于3个科属6种中药的鉴定.本方法结果可靠,重现性好,可以作为中药鉴定的一种有效手段.
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