TLC-SERS法快速检测降压类中药中非法添加的四种化学成分

建立了薄层色谱(TLC)与表面增强拉曼光谱(SERS)联用方法对降压类中药中四种非法添加的化学成分，即盐酸尼卡地平、甲磺酸多沙唑嗪、盐酸普萘洛尔及氢氯噻嗪进行快速检测的新方法。利用TLC法将掺杂成分与中药基质进行简单分离，采用SERS法对薄层板上的微量物质进行定性检测。实验中通过优化银胶浓度和薄层展开体系，并考察掺杂成分的最低检测限，初步建立可用于降压类中药非法添加化学成分的TLC-SERS检测方法。结果表明，该方法用于检测这四种化学成分时专属性较好，检测限低可至0.005 μg，最终检测出十种降压类中药中有两种非法添加了化学成分。本方法简便快速，能实现降压类中药中非法添加化学成分的快速检测，有望成为中药掺杂化学成分的现场检测的新方法。

Rapid Detection of Four Antipertensive Chemicals Adulterated in Traditional Chinese Medicine for Hypertension Using TLC-SERS

A novel facile method for on-site detection of antipertensive chemicals (e.g. nicardipine hydrochloride, doxazosin mesylate, propranolol hydrochloride, and hydrochlorothiazide) adulterated in traditional Chinese medicine for hypertension using thin layer chromatography (TLC) combined with surface enhanced Raman spectroscopy (SERS) was reported in the present paper. Analytes and pharmaceutical matrices was separated by TLC, then SERS method was used to complete qualitative identification of trace substances on TLC plate. By optimizing colloidal silver concentration and developing solvent, as well as exploring the optimal limits of detection (LOD), the initially established TLC-SERS method was used to detect real hypertension Chinese pharmaceuticals. The results showed that this method had good specificity for the four chemicals and high sensitivity with a limit of detection as lower as to 0.005 μg. Finally, two of the ten antipertensive drugs were detected to be adulterated with chemicals. This simple and fast method can realize rapid detection of chemicals illegally for doping in antipertensive Chinese pharmaceuticals，and would have good prospects in on-site detection of chemicals for doping in Chinese pharmaceuticals.