高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (7): 987.

• 论文 • 上一篇    下一篇

螯合剂与牛血清白蛋白竞争配位钕(Ⅲ)的动力学研究

张保林, 王文清, 吴永慧   

  1. 北京大学技术物理系, 北京, 100871
  • 收稿日期:1991-07-16 出版日期:1992-07-24 发布日期:1992-07-24
  • 通讯作者: 王文清

Studies on Kinetics of the Competition Between Chelating Agents and Bovine Serum Albumin for Nd(Ⅲ)

ZHANG Bao-lin, WANG Wen-qing, WU Yong-hui   

  1. Department of Technical Physics, Peking University, Beijing, 100871
  • Received:1991-07-16 Online:1992-07-24 Published:1992-07-24

摘要: 血清白蛋白是生物体内的重要载体蛋白,它对许多内源性和外源性物质有广泛的结合能力[1,2],如能结合脂肪酸、胆红素、无机离子及各种药物等.我们曾系统测定了11种稀土(Ⅲ)与牛血清白蛋白(BSA)的结合常数,k介于104~105之间,还通过紫外及荧光光谱研究了稀土离子(Ⅲ)与BSA相互作用机理.

关键词: 牛血清白蛋白, 钕(Ⅲ), 螯合竞争

Abstract: The competition kinetics of six chelating agents(DTPA, EDTA, NTA, Cit, His, Cys) with bovine serum albumin(BSA) for the labeled neodymium (147Nd(Ⅲ)) was studied by the Centrifugal Ultrafiltration method.The parameter A, which is defined as the dissociation percentage of Nd(I) bound to BSAin the presence of chelating agents, can be used as the criterion for the estimation of the mobilizing ability of chelating agents.Avalues determined experimentally lead to a mobilizing ability order: DTPA>EDTA>NTA>Cit>His>Cys.The experimental results show that the polyaminopolycarboxylated type chelating agent especially DTPAand EDTA, are stronger than the others.The kinetics of these reactions has been studied at pH 6.30 and the mechanism is elucidated.It is found that the reactions of DTPA, EDTAand Cit with BSA·Nd (Ⅲ) follow the association mechanism, but those of NTA, His and Cys, the dissociation mechanism.The kinetic constants were determined respectively.

Key words: Bovine serum albumin, Neodymium, Chela ting competition

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