title: Determination of hydroxyurea in plasma and peritoneal fluid by high-performance liquid chromatography using electrochemical detection.
abstract: A sensitive method has been developed for the determination of hydroxyurea in plasma and peritoneal fluid using reversed-phase high-performance liquid chromatography (HPLC) with electrochemical detection. Plasma or peritoneal fluid samples were treated with acetonitrile to precipitate proteins then injected to the HPLC. A C18 analytical column was used to separate hydroxyurea from interfering substances in the biological matrix. The mobile phase, consisting of 0.2 M sodium perchlorate-methanol (95:5, v/v) adjusted to pH 5.0, was delivered isocratically at a flow-rate of 1 ml/min and hydroxyurea was detected using a glassy-carbon electrode operating at an applied potential of +800 mV. Hydroxyurea eluted with a retention time of 3 min. The cycle time for analysis is short and the assay precision is acceptable (C.V. plasma=1.4-3.9%. C.V. peritoneal fluid=2.1-9.7%). The method has been validated and is linear from 25 to 400 ng/ml in plasma and 5 to 30 ng/ml in peritoneal fluid. The method has been shown to be applicable for pharmacokinetic studies.
authors.affiliation: Department of Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles 90033, USA.
authors.forename: M P
authors.initials: MP
authors.lastname: Pujari
authors.forename: A
authors.initials: A
authors.lastname: Barrientos
authors.forename: F M
authors.initials: FM
authors.lastname: Muggia
authors.forename: R T
authors.initials: RT
authors.lastname: Koda
mesh_terms: D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000032:analysis / Q000097:blood*; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001202:Ascitic Fluid / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D004355:Drug Stability; D004563:Electrochemistry; D005467:Floxuridine / Q000008:administration & dosage; D006801:Humans; D006918:Hydroxyurea / Q000008:administration & dosage / Q000032:analysis / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000970:Antineoplastic Agents; D005467:Floxuridine; D006918:Hydroxyurea