Fractions of thermodynamic functions for native lysozyme adsorption onto moderately hydrophobic surface

被引：14

作者：

Geng, X. P. ^{[1
]}

Zheng, M. R. ^{[1
]}

Wang, B. H. ^{[3
]}

Lei, Z. M. ^{[1
]}

Geng, X. D. ^{[2
]}

机构：

[1] Xian Polytech Univ, Coll Environm & Chem Engn, Xian 710048, Peoples R China

[2] NW Univ Xian, Inst Modern Separat Sci, Xian 710069, Peoples R China

[3] Peking Univ, Inst Phys Chem, Beijing 100871, Peoples R China

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2008年 / 93卷 / 02期

基金：

中国国家自然科学基金;

关键词：

adsorption; calorimetry; fractions of thermodynamic functions; hydrophobic surface; lysozyme;

D O I：

10.1007/s10973-007-8676-5

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Calorimetric measurement of adsorption enthalpies of native lysozyme(Lyz) on a moderately hydrophobic surface at 25 degrees C, pH 7.0 and various salt concentrations was performed. Based on the thermodynamics of stoichiometric displacement theory (SDT), we calculated the fractions of thermodynamic functions involving four subprocesses during a displacement adsorption process from the directly determined enthalpies in combination with adsorption isotherm measurements. The thermodynamic fractions reveal the relative degree of the four subprocesses for contributions to enthalpy, entropy and free energy. The results show that native Lyz adsorption on a moderately hydrophobic surface is an entropy driven process contributed mainly by conformational loss of adsorbed Lyz.

引用

页码：503 / 508

页数：6

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