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On the Effect of Organic Solvent Composition on the pH of Buffered HPLC Mobile Phases and the pK(a) of Analytes - A Review A review about the analyte pK a and buffer pH variations in RP©\HPLC mobile phases with the changes in the organic modifier content (acetonitrile or methanol) is presented. A model to accurately predict the pH of particular mobile phases for several commonly used buffers (acetic, citric and phosphoric acid and ammonia systems) in acetonitrile©\water and methanol©\water mixtures is described. Linear relationships are also presented for several families of acid©\base compounds (aromatic and aliphatic carboxylic acids, phenols, amines and pyridines) to estimate pK a values of analytes in methanol©\water and acetonitrile©\water from their corresponding aqueous pK a. From both, the estimated pH of the mobile phase and the estimated pK a of acid©\base analytes, it is possible to predict their degree of ionization and, therefore, the analyte chromatographic retention.[ Last edited by cat-liujiang on 2011-8-4 at 16:35 ] |
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