摘要
将NeCl水溶液中带电蛋白质分子间的静电排斥作用用Yukawa位能函数描述,蛋白质分子间的色散作用用Lennard-Jones位能函数描述,代替了经典DLVO理论.基于McMillan-Mayer渗透压统计理论,将Duh和Mier-YTeran的Yukawa状态方程与Cotterman等的Lennard-Jones微扰公式相结合,建立了一个新的状态方程,并采用该状态方程研究了含有NaCl的牛血清蛋白(简称BSA)水溶液的渗透压.依据BSA在0.15 mol/L NaCl水溶液中的回归参数可预测其在l～5 mol/L NaCl水溶液中的渗透压.该状态方程采用了两个回归参数(硬球直径和LJ参数),具有一定的关联和预测效果,并与已有的其它理论模型进行了比较.
The double - layer electric repulsion and dispersion attractive interactions between bovine serum albumin (BSA) molecules in aqueous NaCl solution are represented by a Yukawa potential and a Lennard-Jones potential, respectively, instead of the classical DLVO theory. Based on the osmotic McMillan - Mayer statistical theory, a new equation of state (EOS) is proposed in combination of a Yukawa EOS of Duh and Mier - Y - Teran with a perturbed IJ equation of Cotterman etc. to con-elate and predict the osmotic pressure data of aqueous BSA solution with NaCl. The result from the correlation of BSA in 0.15 mol/L NaCl aqueous solution can be used to predict the osmotic pressure of BSA in 1 similar to 5 mol/L aqueous NaCl solution. Two adjustable parameters (hard - sphere diameter sigma and IJ parameter epsilon /k) are used in this EOS with good con-elation and prediction results. A comparison with other theories is also discussed.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2001年第12期2110-2115,共6页
Acta Chimica Sinica
基金
国家自然科学基金
