1976～1977年我们在扩大试制穿心莲甲素注射液,提取穿心莲总内酯的过程中发现在析晶后的母液中仍存在不少总内酯,这可能是由于树脂类杂质的存在阻碍了结晶的析出。我们摸索了含量测定方法找到用薄板层析——重量法测定总内酯,误差不大,可以应用。测定多批提取总内酯后的母液浸膏 From 1976 to 1977, we expanded the trial of Andrographis alkaloid injection and extracted the total lactone of Andrographis. It was found that there were still a lot of total lactones in the mother liquor after crystallization. This may be due to the presence of resin impurities hindered the crystallization. The precipitation. We explored the content determination method to find the use of thin plate chromatography - gravimetric method for determining total lactones, the error is not great, can be applied. Determination of mother liquors after batch extraction of total lactones