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南方科技大学公共卫生及应急管理学院2026级博士研究生招生报考通知(长期有效)
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cat-liujiang

铁杆木虫 (正式写手)


[资源] 分享一篇讨论反相液相色谱流动相PH的综述

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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danromm

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★★★★★ 五星级,优秀推荐

为啥下载不了啊? :((
25楼2012-05-10 16:10:24
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