高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (11): 1687.

• 论文 • 上一篇    下一篇

牛血清白蛋白与甲基橙结合反应的研究

魏永巨, 李克安, 童沈阳   

  1. 北京大学化学系, 北京, 100871
  • 收稿日期:1995-10-23 出版日期:1996-11-24 发布日期:1996-11-24
  • 通讯作者: 童沈阳
  • 作者简介:魏永巨,男,41岁,博士,副教授.
  • 基金资助:

    国家自然科学基金;国家教育委员会博士点基金

Interaction of Bovine Serum Albumin with Methyl Orange in Acidic Solution

WEI Yong-Ju, LI Ke-An, TONG Shen-Yang   

  1. Department of Chemistry, Peking University, Beijing, 100871
  • Received:1995-10-23 Online:1996-11-24 Published:1996-11-24

摘要: 用分光光度法研究了牛血清白蛋白与甲基橙在酸性溶液中的结合反应,认为两者通过非共价键结合。研究了溶液吸光度与组分浓度的关系,对Scatchard模型用于处理蛋白质染色反应时存在的问题作了讨论,提出了表现结合常数的概念,推导了求算表观结合常数和最大结合数的线性回归公式。实验发现离子强度和溶液酸度对结合反应有显着影响。

关键词: 牛血清白蛋白, 甲基橙, 溶液平衡, 理论模型, 分光光度法

Abstract: The interaction of methyl orange(MO) with bovine serum albumin(BSA)in acidic solution was investigated by a spectrophotometric method. It was considered that the combination of BSAwith MO is due to the noncovalent binding forces.The color change during the binding process is because of the transformation of MO from free-acidic form into bound-basic form.The relationship between absorbance and concentrations of MO species was studied.The Scatchard model was discussed in a new point of view.Two conditional constants,apparent binding constant and maximum binding number,were proposed to express the binding ability of MO on BSA,and two linear regression equations were derived to estimate these two parameters.It was found that sodium chloride concentration and acidity have significant effect on the binding reaction.

Key words: Bovine serum albumin, Methyl orange, Solution equilibria, Theoretical model, Spectrophotometry

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