title: Application of the restricted-access precolumn packing material alkyl-diol silica in a column-switching system for the determination of ketoprofen enantiomers in horse plasma.
abstract: The group of LiChrospher ADS (alkyl-diol silica) sorbents that make part of a unique family of restricted-access materials, have been developed as special packings for precolumns used in the LC-integrated sample processing of biofluids. The advantage of these sorbents lies in the direct injection of untreated biological fluids, that is without sample clean-up, the elimination of the protein matrix with a quantitative recovery together with an on-column enrichment. The present method is based on previous work applying UV detection at 260 nm for ketoprofen determinations. Plasma samples introduced to the ADS precolumn using a 0.1 M phosphate buffer, pH 7.0. After washing with the buffer the ADS column was backflushed with the mobile phase 0.01 M phosphate buffer-6% (v/v) 2-propanol-5 mM octanoic acid at a pH of 5.5, thus transporting the analytes to the chiral-HSA (human serum albumin) (100x4.0 mm) column where the separation of the ketoprofen enantiomers was achieved with a resolution factor of 1.4. The developed column-switching method was fully applicable to plasma injections.
authors.affiliation: Laboratory of Drug Quality Control, Faculty of Pharmaceutical Sciences, University of Ghent, Belgium. willy.baeyens@rug.ac.be
authors.forename: W R
authors.initials: WR
authors.lastname: Baeyens
authors.forename: G
authors.initials: G
authors.lastname: Van der Weken
authors.forename: J
authors.initials: J
authors.lastname: Haustraete
authors.forename: H Y
authors.initials: HY
authors.lastname: Aboul-Enein
authors.forename: S
authors.initials: S
authors.lastname: Corveleyn
authors.forename: J P
authors.initials: JP
authors.lastname: Remon
authors.forename: A M
authors.initials: AM
authors.lastname: García-Campaña
authors.forename: P
authors.initials: P
authors.lastname: Deprez
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000097:blood* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation*; D006736:Horses; D007660:Ketoprofen / Q000097:blood* / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet; D013237:Stereoisomerism
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D007660:Ketoprofen