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黄芩为唇形科植物黄芩Scutellariabaicalensis Georgi的干燥根,具清热燥湿,泻火解毒,止血安胎的功效。近在青海省中药市场中发现其近缘种滇黄芩 S.amoena C.H.Wright的干燥根混充黄芩。因两者外观性状差异较小,仅进行宏观鉴别不易区分。本文利用紫外光谱和薄层色谱进行的鉴别效果理想。1 紫外光谱鉴别 分别取两者粗粉各1.0g,加入乙醚、氯仿、95％乙醇各 20ml,密闭,放置24h 后过滤,滤液密封备用。精取上述不同滤液各5ml,分置100ml容量瓶中,加入相应的溶
Astragalus membranaceus is a dry root of L. astragalus Scutellariabaicalensis Georgi, with heat and dampness, purging and detoxifying, and hemostasis. The dry roots of S.amoena C.H. Wright, a closely related species of Astragalus membranaceus, have been found in Qinghai Province’s traditional Chinese medicine market. Due to the small difference in appearance characteristics between the two, it is difficult to distinguish only by macroscopic identification. This article uses UV and thin-layer chromatography to perform the discriminating effect. 1 Ultraviolet spectral identification Separately take 1.0 g each of the coarse powders, add 20 ml each of ether, chloroform, and 95% ethanol, seal them, place them for 24 hours, and filter. The filtrate is sealed for use. 5 ml each of the above-mentioned different filtrates are finely collected, and 100 ml volumetric flasks are divided and added to the corresponding solutions.