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一、溶媒組成的變化酊劑中的酒精含量由於原料生藥含有水分2—20%,雖用規定濃度的酒精浸出,但製得的酊劑中所含酒精百分率亦必降低。又在配製時因屡次過濾与空氣接觸時间較長,使酒精揮發,因而溶媒的濃度更發生變化。酊劑係酒精飽和浸出液,此種濃度的变化即為貯存時溶解成分沉澱的原因。又酒精與酊劑中的含有物質能否引起變化亦應考慮。例如Schlemmer氏等
First, the composition of the solvent changes in the alcohol content of the tincture Since the crude drug raw material contains 2-20% of water, although leaching with the specified concentration of alcohol, but the percentage of alcohol contained in the obtained tincture will also be reduced. In addition, the time for the repeated filtration and air contact for a long time causes the alcohol to evaporate and the concentration of the solvent changes. The tanning agent is an alcohol-saturated leachate. The change in this concentration is the cause of the precipitation of dissolved components during storage. It should also be considered whether the substances contained in alcohols and tinctures can cause changes. For example, Schlemmer et al.