title: Simple and rapid determination of carboplatin in plasma by high-performance liquid chromatography. Error pattern and application to clinical pharmacokinetic studies.
abstract: Carboplatin is an antitumor agent widely employed in cancer chemotherapy. A specific and selective method for the determination of carboplatin in human plasma and its applications to pharmacokinetic investigations is described. One ultrafiltration step, through a Centrifree micropartition system (Amicon) at 2000 g for 10 min, is the only requirement as sample treatment. The resulting solution is injected into an Inertsil ODS-2 (5 microm, 25 cm x 4.6 mm I.D.) analytical column. The mobile phase consisted of 0.1 M potassium dihydrogenphosphate with 1 mM dipotassium edetate adjusted to a pH between 3 and 3.5. The limit of quantitation was 1 mg/l. The method showed good recovery (100.68+/-5.49%) and precision: the within-day relative standard deviation (RSD) for carboplatin (3-350 mg/l) was 2.07% and the between-day RSD for carboplatin, in the previously described range, was 1.31%. We determined the assay error pattern for proper weighting of serum level data in pharmacokinetic models. The selectivity (discrimination between the parent drug and platinum-containing species such as carboplatin metabolites), simplicity and speed of this assay for free carboplatin quantitation should facilitate pharmacokinetic investigations and therapeutic drug monitoring.
authors.affiliation: Pharmacy Department, University Hospital of Navarra, Pamplona, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Zufía
authors.forename: A
authors.initials: A
authors.lastname: Aldaz
authors.forename: C
authors.initials: C
authors.lastname: Castellanos
authors.forename: J
authors.initials: J
authors.lastname: Giráldez
mesh_terms: D000970:Antineoplastic Agents / Q000097:blood* / Q000493:pharmacokinetics; D016190:Carboplatin / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000970:Antineoplastic Agents; D016190:Carboplatin