title: Measurement of physiological concentrations of dapsone and its monoacetyl metabolite: a miniaturised assay for liquid or filter paper-absorbed samples.
abstract: A modification of existing HPLC assay methods is described for the measurement of dapsone and monoacetyldapsone in 50-microliter samples of plasma and whole blood. This method, in particular the use of small sample volumes dried onto filter paper strips, is applicable to multi-sample clinical and pharmacokinetic studies in children with malaria, who are often anaemic, and where sample volume must be kept to a minimum. Basified samples were extracted into 5 ml of ethyl acetate-tert.-butylmethyl ether (1:1, v/v), chromatographed on a mu BondapaK C18, 10-micron column with water-acetonitrile-glacial acetic acid (81:17.5:5, v/v) containing 2 g/l l-octanesulphonic acid as the mobile phase and detected at 274 nm.
authors.affiliation: Wellcome Trust Research Laboratories, Nairobi, Kenya.
authors.forename: E K
authors.initials: EK
authors.lastname: Mberu
authors.forename: D K
authors.initials: DK
authors.lastname: Muhia
authors.forename: G O
authors.initials: GO
authors.lastname: Minyiri
authors.forename: E W
authors.initials: EW
authors.lastname: Njonge
authors.forename: W M
authors.initials: WM
authors.lastname: Watkins
mesh_terms: D000962:Antimalarials / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002854:Chromatography, Paper; D003622:Dapsone / Q000031:analogs & derivatives* / Q000097:blood*; D006801:Humans; D015203:Reproducibility of Results
chemical_list: D000962:Antimalarials; D003622:Dapsone; C018965:monoacetyldapsone