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近年来,微量制样技术在红外光谱分析中受到了人们的重视,特别是在测定天然产物中微量有效成分的结构及研究药物的代谢机制工作中,这种技术更显其重要性。红外光谱分析中的微量制样技术有微量压片、微量溶液、微量液膜等各种方法。其中溴化钾微量压片法应用最多,它的特点是方法简便,检出灵敏度较高。目前,可检测的样品极限为十微克左右。近年来由于电子计算机的迅速发展及其应用于红外光谱仪中,提高了红外微量样品的检测极限。带计算机的红外光谱仪使用专门的微量附件,据报导,目前已能检测1微克的样品。对于微量混合样品一般都采用色谱法进行分离后,再作微量光谱测定。薄层色谱(TLC)是最常用的色谱分离法,但在色谱分离后存在如何萃取所需的组
In recent years, the micro-sample preparation technology has received the attention of people in the infrared spectrum analysis. Especially in the determination of the structure of trace active ingredients in natural products and the study of the metabolic mechanism of drugs, this technique is even more important. Infrared spectroscopy in the micro-sample preparation techniques such as micro-tablet, trace solution, trace liquid film and other methods. One of the most widely used potassium bromide tabletting method, which is characterized by the method is simple, high detection sensitivity. Currently, the limit of detectable samples is about ten micrograms. In recent years, due to the rapid development of electronic computers and their application in infrared spectroscopy, the detection limit of infrared trace samples has been raised. The infrared spectrometer with a computer uses a dedicated trace accessory, which is reportedly capable of detecting 1 microgram of sample. For trace mixed samples are generally separated by chromatography, and then for trace determination. Thin-layer chromatography (TLC) is the most commonly used chromatographic separation method but there is a set of techniques required for extraction after chromatographic separation