title: Content uniformity and assay requirements in current regulations.
abstract: The acceptance of a tablet batch is based both on the content uniformity test and on the assay. It is shown that these two characteristics are not independent, and the acceptance criteria for them are not even consistent. For content uniformity range three methods of calculation are compared: the present European Pharmacopoeia method, a tolerance range method with improved k tolerance factor and a one-way random effects analysis of variance model. To resolve the inconsistency several options are discussed: applying the holistic content uniformity range alone; using content uniformity standard deviation and assay mean simultaneously or applying a criterion based on Taguchi's quadratic loss function.
authors.affiliation: Department of Chemical Engineering, Budapest University of Technology and Economics, Budapest, Hungary. banfai@mail.bme.hu
authors.forename: Balázs
authors.initials: B
authors.lastname: Bánfai
authors.forename: Katalin
authors.initials: K
authors.lastname: Ganzler
authors.forename: Sándor
authors.initials: S
authors.lastname: Kemény
mesh_terms: D008433:Mathematics; D004364:Pharmaceutical Preparations / Q000592:standards*; D010602:Pharmacopoeias as Topic / Q000592:standards; D013607:Tablets / Q000592:standards
chemical_list: D004364:Pharmaceutical Preparations; D013607:Tablets