title: Novel on-line column extraction apparatus coupled with binary peak focusing for high-performance liquid chromatography determination of rifampicin in human plasma: a strategy for therapeutic drug monitoring.
abstract: In order to develop a method that is completely suitable for the routine therapeutic drug monitoring, a sensitive and fully automated on-line column extraction apparatus in combination with high-performance liquid chromatography allowing binary peak focusing was developed and validated for the determination of rifampicin in human plasma. Rifapentine was used as an internal standard. The analytical cycle started with the injection of 100 μL of the sample pretreated by protein precipitation in a Venusil SCX extraction column. After the elution, the analytes were transferred and concentrated in an Xtimate C18 trap column. Finally, the trapped analytes were separated by an Xtimate C18 analytical column and were analyzed by an ultraviolet detector at 336 nm. With this new strategy, continuous on-line analysis of the compounds was successfully performed. The method showed excellent performance for the analysis of rifampicin in plasma samples, including calibration curve linearity (All r were larger than 0.9996), sensitivity (lowest limit of quantification was 0.12 μg/mL), method accuracy (within 6.6% in terms of relative error), and precision (relative standard deviations of intra- and interday precision were less than 7.8%). These results demonstrated that the simple, reliable, and automatic method based on on-line column extraction and binary peak focusing is a promising approach for therapeutic drug monitoring in complex biomatrix samples.
authors.affiliation: Hunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Peng
authors.forename: Minghui
authors.initials: M
authors.lastname: Long
authors.forename: Ximin
authors.initials: X
authors.lastname: Qiu
authors.forename: Liping
authors.initials: L
authors.lastname: Yang
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation*; D004058:Diffusion; D016903:Drug Monitoring / Q000295:instrumentation*; D006801:Humans; D015394:Molecular Structure; D012293:Rifampin / Q000097:blood* / Q000627:therapeutic use
chemical_list: D012293:Rifampin
keywords: Column extraction; Focusing; High-performance liquid chromatography; Rifampicin; Therapeutic drug monitoring