1. WHO 给出的对照品含量计算公式:对照品含量% = 100% - 有机杂质% - 无机杂质% - 水分% - 残留溶剂%。 关于WHO 在TRS,No.943 Annex中提到: The total of the determinations of water content, organic solvents, mineral impurities and organic components should amount to 100%.
USP Reference Standard Development: From Cradle to Catalog文中提到:上述公式的来源
3.欧洲药典(EP)5.12 Reference standards 中提到的:采用的是质量守恒,但是未有提及公式 For a European Pharmacopoeia chemical reference substance established for assay purposes, the assigned content is usually calculated from the values obtained from the analyses performed for the determination of impurities (organic, inorganic, water and solvents) by applying the principle of mass balance。
在EDQM2021年培训教材中发现公式:Reference Standards for chemical and medicinal product monographs。Dr. Bart Blanchaert Study Director Analytical Chemistry Division Laboratory Department 02 July 2021, Strasbourg, France (100 % - water % - residual solvents %) x [(100 % - sum of impurities by LC %) / 100 %]