[Determination of Absolute Purities of Hygroscopic Substances by Quantitative NMR Analysis for the Standardization of Quantitative Reagents in the Japanese Pharmacopoeia (Part 1)].

In this study, we investigated that the hygroscopicity of reagents could cause the changes in the compounds' purity depending on increasing their water content. Twenty-one standard products used for the crude-drug test in JP were examined by water sorption-desorption analysis, and ginsenosides and saikosaponins were found to be hygroscopic. To prepare a sample solution of saikosaponin b2 for qNMR analysis, samples need to be maintained for 18 h at 25°C and 76% relative humidity; further, samples need to be weighed at the same humidity for the qNMR analysis.
PMID: 32741864 [PubMed - in process]

Source: Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan - August 5, 2020 Category: Drugs & Pharmacology Authors: Uchiyama N, Hosoe J, Miura T, Sugimoto N, Ishizuki K, Yamada Y, Iwamoto Y, Suematsu T, Komatsu T, Maruyama T, Igarashi Y, Higano T, Shimada N, Goda Y Tags: Yakugaku Zasshi Source Type: research