药材的水浸出制剂易生霉发酵,所以应用不广,在某些情况下,醇作浸出溶媒也有缺点,如洋地黃的水浸出液与用不同浓度醇所制得的浸出液,其中有效成分甙的含量因醇的浓度不同而有别。用水作浸出媒有时较合适,但水浸液内虽加了防腐剂也不能长期貯存,并且防腐剂往往有化学、药理的作用。 The water leaching preparation of medicinal materials is prone to mildew fermentation, so it is not widely used. In some cases, alcohol is also used as a solvent for leaching. There are also drawbacks such as the aqueous leachate of digitalis and the leachate prepared with different concentrations of alcohol. The content differs depending on the alcohol concentration. The use of water as an lixiviation medium is sometimes appropriate, but an antiseptic cannot be stored for a long period of time in the aqueous solution, and the preservatives often have chemical and pharmacological effects.