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鉴别成药中的人工牛黄、动物胆汁等常常用胆酸类成分和糖醛在硫酸的氧化作用下缩合生成有色产物这一显色反应来判断。我们在药检工作中发现，应用这个反应时需注意两个问题：（1）这一反应的最终颜色与硫酸的加入量有很大关系；（2）在不含胆酸类成分的情况下糠醛和硫酸也可以
The artificial bezoar, animal bile, etc. in the identification medicine are often judged by the color reaction of the cholic acid component and the acetaldehyde condensation under the oxidation of sulfuric acid to form a colored product. We found in the drug inspection work that there are two issues to be aware of when applying this reaction: (1) The final color of this reaction is closely related to the amount of sulfuric acid added; (2) Furfural in the absence of cholic acid And sulfuric acid can also