文章基本信息

标题：Determination of Absolute Purities of Hygroscopic Substances by Quantitative NMR Analysis for the Standardization of Quantitative Reagents in the Japanese Pharmacopoeia (Part 2)
本地全文：下载
作者：Nahoko Uchiyama ; Junko Hosoe ; Toru Miura 等
期刊名称：Chemical and Pharmaceutical Bulletin
印刷版ISSN：0009-2363
电子版ISSN：1347-5223
出版年度：2021
卷号：69
期号：1
页码：26-31
DOI：10.1248/cpb.c20-00296
出版社：The Pharmaceutical Society of Japan
摘要：As a new absolute quantitation method for low-molecular compounds, quantitative NMR (qNMR) has emerged. In the Japanese Pharmacopoeia (JP), 15 compounds evaluated by qNMR are listed as reagents used as the HPLC reference standards in the assay of crude drug section of the JP. In a previous study, we revealed that humidity affects purity values of hygroscopic reagents and that (i) humidity control before and during weighing is important for a reproducible preparation and (ii) indication of the absolute amount (not purity value), which is not affected by water content, is important for hygroscopic products determined by qNMR. In this study, typical and optimal conditions that affect the determination of the purity of ginsenoside Rb 1 (GRB1), saikosaponin a (SSA), and barbaloin (BB) ( i.e. , hygroscopic reagents) by qNMR were examined. First, the effect of humidity before and during weighing on the purity of commercial GRB1, with a purity value determined by qNMR, was examined. The results showed the importance afore-mentioned. The results of SSA, which is relatively unstable in the dissolved state, suggested that the standardization of humidity control before and during weighing for a specific time provides a practical approach for hygroscopic products. In regard to BB, its humidity control for a specific time, only before weighing, is enough for a reproducible purity determination.
关键词：quantitative NMR;hygroscopic substance;the Japanese Pharmacopoeia;absolute purity;marker compound;crude drug