Habib A A, El-Sebakhy N A, Kadry H A
J Pharm Sci. 1979 Oct;68(10):1221-3. doi: 10.1002/jps.2600681007.
A new colorimetric method for glycyrrhizin in licorice and drug preparations is given. The method is based on coupling the acidic genin, glycyrrhetinic acid, with methylene blue and measuring the extinction of the coupled compound solution in chloroform-alcohol.
提出了一种测定甘草及药物制剂中甘草酸的新比色法。该方法基于酸性配基甘草次酸与亚甲蓝的偶联反应,并测定偶联化合物溶液在氯仿 - 乙醇中的吸光度。