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薄层色谱法是一种快速而有效的分离分析方法。这种方法应用于生药分析,可以大大缩短生药成分的定性、定量分析时间。但是,和薄层色谱法的点样、展开及其后的分析过程比较,生药样品的前处理过程,即提取、浓缩、净化,却往往要花很长时间。因而,寻找更有效的微量提取方法,将生药成分从样品直接转移到薄板上,以进一步缩短生药分析时间,是很有意义的。正是出于这种考虑,Stahl 设计并研究了热微量转移法。这是一种和薄层色谱法联用的微量的热提取方法,简称 TAS 法(=Thermomikro-,Tran
Thin-layer chromatography is a fast and efficient separation and analysis method. The application of this method to crude drug analysis can greatly reduce the qualitative and quantitative analysis time of crude drug components. However, compared with the spotting, unfolding, and subsequent analysis of thin-layer chromatography, the pretreatment process of the crude drug sample, ie, extraction, concentration, and purification, often takes a long time. Therefore, it is of great significance to search for a more effective micro-extraction method and transfer the crude drug components directly from the sample to the sheet to further shorten the crude drug analysis time. It is for this reason that Stahl designed and studied the thermal microtransfer method. This is a trace hot extraction method combined with thin layer chromatography, abbreviated TAS method (=Thermomikro-, Tran