title: Evaluation of drug-free plasma profiles by high-performance liquid chromatography following on-line solid-phase extraction.
abstract: The effect of varying the type of column and eluent composition on drug-free plasma profiles was investigated. The study was based on a C18 and a CN column; methanol and acetonitrile were the organic modifiers used. The plasma profiles were evaluated quantitatively by measuring the number of interfering peaks greater than 8 . 10(-4) absorbance units in the area of interest along the chromatogram. Results were subjected to statistical treatment using a three-factor analysis of variance design. The three factors were the column, the type of organic modifier and either the percentage organic modifier, the pH or the ionic strength. Analysis of the data revealed that significant effects were seen with changing eluent composition, particularly with regard to the percentage of organic modifier, and that the observed effects were strongly dependent on the type of column and the type of organic modifier under consideration.
authors.affiliation: School of Chemical Sciences, Dublin City University, Glasnevin, Ireland.
authors.forename: M T
authors.initials: MT
authors.lastname: Kelly
authors.forename: M R
authors.initials: MR
authors.lastname: Smyth
authors.forename: H
authors.initials: H
authors.lastname: Ruskin
mesh_terms: D000097:Acetonitriles; D000704:Analysis of Variance; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006863:Hydrogen-Ion Concentration; D000432:Methanol; D010949:Plasma / Q000032:analysis*; D012997:Solvents; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000097:Acetonitriles; D012997:Solvents; D000432:Methanol; C032159:acetonitrile