title: Rapid quantitation of (-)-2'-deoxy-3'-thiacytidine in human serum by high-performance liquid chromatography with ultraviolet detection.
abstract: A rapid, sensitive and specific high-performance liquid chromatographic (HPLC) assay was developed and validated for the measurement of (-)-2'-deoxy-3'-thiacytidine (3TC) in human serum. The method included precipitation of serum proteins by trichloroacetic acid (20%, w/v) treatment followed by centrifugation. The resulting supernatant was directly injected and 3TC was isocratically chromatographed on a reversed-phase C18 column using a mixture of phosphate buffer and methanol (88.3:11.7. v/v) and monitored at 280 nm. The limit of quantitation was 20 ng/ml using 100 microl of serum. The standard curve was linear within the range of 20-10,000 ng/ml. Replicate analysis of three quality control samples (40-1500 ng/ml) led to satisfactory intra- and inter-assay precision (coefficient of variation from 3.0 to 12.9%) and accuracy (deviation from 6.3 to 9.7%). Moreover, sample treatment processes including human immunodeficiency virus (HIV) heat-inactivation, exposure at room temperature and freezing-thawing cycles did not influence the stability of the analyte. This assay was successfully applied to the determination of 3TC serum levels in HIV-infected patients. In addition, preliminary results indicated that this procedure may also be extended to the measurement of 3TC in human plasma and urine.
authors.affiliation: Department of Pharmacology and Toxicology, Center for AIDS Research, University of Alabama at Birmingham, 35294-0019, USA.
authors.forename: X J
authors.initials: XJ
authors.lastname: Zhou
authors.forename: J P
authors.initials: JP
authors.lastname: Sommadossi
mesh_terms: D019380:Anti-HIV Agents / Q000097:blood* / Q000493:pharmacokinetics / Q000652:urine; D002851:Chromatography, High Pressure Liquid; D004355:Drug Stability; D006801:Humans; D019259:Lamivudine / Q000097:blood* / Q000493:pharmacokinetics / Q000652:urine; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D019380:Anti-HIV Agents; D019259:Lamivudine