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Gibbs free energy of transfer of a methylene group on {UCON + (sodium or potassium) phosphate salts} aqueous two-phase systems: Hydrophobicity effects

机译:{UCON +(钠或钾)磷酸盐}水性两相系统上的亚甲基转移的吉布斯自由能:疏水作用

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摘要

The Gibbs free energy of transfer of a suitable hydrophobic probe can be regarded as a measure of therelative hydrophobicity of the different phases. The methylene group (CH2) can be considered hydrophobic,and thus be a suitable probe for hydrophobicity. In this work, the partition coefficients of a series offive dinitrophenylated-amino acids were experimentally determined, at 23 °C, in three different tie-linesof the biphasic systems: (UCON + K2HPO4), (UCON + potassium phosphate buffer, pH 7), (UCON +KH2PO4), (UCON + Na2HPO4), (UCON + sodium phosphate buffer, pH 7), and (UCON + NaH2PO4). TheGibbs free energy of transfer of CH2 units were calculated from the partition coefficients and used to comparethe relative hydrophobicity of the equilibrium phases. The largest relative hydrophobicity was foundfor the ATPS formed by dihydrogen phosphate salts.
机译:合适的疏水探针转移的吉布斯自由能可以看作是不同相的相对疏水性的量度。可以认为亚甲基(CH 2)是疏水的,因此是用于疏水性的合适探针。在这项工作中,在23°C下,通过双相系统的三个不同的连接线,通过实验确定了一系列重要的二硝基苯甲基化氨基酸的分配系数:(UCON + K2HPO4),(UCON +磷酸钾缓冲液,pH 7) ,(UCON + KH2PO4),(UCON + Na2HPO4),(UCON +磷酸钠缓冲液,pH 7)和(UCON + NaH2PO4)。从分配系数计算出CH2单元转移的吉布斯自由能,并用于比较平衡相的相对疏水性。发现由磷酸二氢盐形成的ATPS具有最大的相对疏水性。

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