微量升华法鉴别中药材是依据中药材中有些成分,当受热时能由固态直接气化挥逸出来,遇冷后凝固而析出的特殊现象进行鉴别。常规操作方法是:取少量药材粉末置一金属片上(与载玻片大小相同),粉末外加铜制或其它材料制的空心圈,圈上加一载玻片,在底部加热,发现有物质凝集在上面的载玻片上,停止加热,将载有升华物的载玻片置显微镜下观察结晶的形状、颜色,在升华物上滴加适当的试剂后,观察其反应变化 Micro-sublimation method to identify Chinese medicinal materials is based on some components of Chinese herbal medicines. When heated, it can be directly vaporized by the solid to escape, and it is identified by the special phenomenon of solidification after being cooled. The usual method of operation is to take a small amount of medicinal powder on a piece of metal (the same size as the slide), add a hollow ring made of copper or other material to the powder, add a glass slide to the circle, heat it at the bottom, and find that there is substance agglutination. On the upper slide glass, stop the heating, observe the shape and color of the crystallized glass slide with the sublimation material under a microscope, and observe the change of reaction after dropping the appropriate reagent on the sublimate.