title: Cerium (IV)-based chemiluminescence analysis of hydrochlorothiazide.
abstract: A flow-injection analytical method for the determination of hydrochlorothiazide is presented. The method is based on the chemiluminescence reaction of hydrochlorothiazide with cerium(IV) in sulphuric acid, sensitized by the fluorescent dye rhodamine 6G. The proposed procedure allows quantitation of hydrochlorothiazide in the concentration range of 0.33-130 mumol l(-1) with a detection limit of 0.15 mumol l(-1), an RSD of 2.4% at 10 mumol l(-1) and a sample measurement frequency of 200 h(-1). The method was successfully applied to the determination of hydrochlorothiazide in pharmaceutical preparations containing, amongst others, lactose, maize starch, calcium phosphate, magnesium stearate, potassium chloride and E 110 (disodium-6-hydroxy-5-(4-sulphonatophenylazo) naphthalene-2-sulphonate) as the concomitant species. Apart from the single formulation, hydrochlorothiazide was also determined in tablets combined with the antihypertensive lisinopril.
authors.affiliation: University of Ghent, Faculty of Pharmaceutical Sciences, Department of Pharmaceutical Analysis, Laboratory of Drug Quality Control, Harelbekestraat 72, B-9000 Ghent, Belgium.
authors.forename: J
authors.initials: J
authors.lastname: Ouyang
authors.forename: W R
authors.initials: WR
authors.lastname: Baeyens
authors.forename: J
authors.initials: J
authors.lastname: Delanghe
authors.forename: G
authors.initials: G
authors.lastname: Van der Weken
authors.forename: A C
authors.initials: AC
authors.lastname: Calokerinos