title: Liquid chromatographic determination of hydralazine in human plasma with 2-hydroxy-1-naphthaldehyde pre-column derivatization.
abstract: A selective and sensitive high-performance liquid chromatographic method is described for determination of hydralazine and its metabolites in human plasma. The method involves pre-column derivatization with 2-hydroxy-1-naphthaldehyde at pH 1.2. The reaction product and Methyl Red used as internal standard are extracted into dichloromethane and chromatographed in the reversed-phase mode on an ODS-2 column using acetonitrile-aqueous triethylamine phosphate buffer (80:20, v/v) at pH 3 as eluent. The plasma calibration curve of hydralazine is linear in the concentration range 10-500 ng ml-1. The detection limit is 1 ng ml-1 and the relative standard deviation is less than 2.4. In vivo pharmacokinetics of hydralazine in two volunteers after oral administration of 50 mg of the drug is studied using the proposed LC method.
authors.affiliation: Laboratory of Food Chemistry, Toxicology and Physicochemistry, Faculty of Pharmacy, University of Valencia, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Mañes
authors.forename: J
authors.initials: J
authors.lastname: Mari
authors.forename: R
authors.initials: R
authors.lastname: Garcia
authors.forename: G
authors.initials: G
authors.lastname: Font
mesh_terms: D001391:Azo Compounds; D002853:Chromatography, Liquid; D006207:Half-Life; D006801:Humans; D006830:Hydralazine / Q000097:blood* / Q000493:pharmacokinetics; D007202:Indicators and Reagents; D009281:Naphthalenes; D012015:Reference Standards; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001391:Azo Compounds; D007202:Indicators and Reagents; D009281:Naphthalenes; D006830:Hydralazine; C008492:methyl red; C062247:2-hydroxy-1-naphthaldehyde