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 C 18 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.
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