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- W2045283604 abstract "The retention parameters of diastereomeric mixtures of 19 lipidic amino acid conjugates have been determined on Spherisorb ODS and Supelcosil LC-ABZ stationary phases by changing the acetonitrile concentration in acetonitrile-0.1% trifluoroacetic acid-water mobile phases. In general, better resolution of the diastereomeric mixtures was obtained on the Supelcosil LC-ABZ stationary phase but in some cases the Spherisorb ODS column showed better separation. The presence of silanol groups improved the separation of the diastereomers in those cases. The log k′ values were plotted against the acetonitrile concentrations. In the case of basic derivatives parabolic relationships could be observed on the Spherisorb ODS stationary phase which contains free silanol groups, while always straight lines were obtained on the Supelcosil LC-ABZ column. The slope and the intercept values were calculated for the straight lines obtained. The octanol-water partition coefficients (log P) and the dissociation constants (pKa) of the compounds were also calculated and were related to the chromatographic parameters. It was found that the chromatographic parameters obtained on the Spherisorb ODS stationary phase showed slightly better correlations with the calculated hydrophobicity and pKa parameters than those obtained on the Supelcosil LC-ABZ column, which shows that different retention mechanism can be expected on the two stationary phases." @default.
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- W2045283604 date "1994-01-01" @default.
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- W2045283604 title "Structure-retention relationships of diastereomeric mixtures of lipidic amino acid conjugates on reversed-phase stationary phases" @default.
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- W2045283604 doi "https://doi.org/10.1016/0021-9673(94)85072-0" @default.
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