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作 者:任晓英 王静 冯翠丽 王伟[2] 王清君[2] 李志强
机构地区:[1]河北省保定市第二医院急诊科,河北保定071051 [2]河北医科大学药学院无机物化教研室,河北石家庄050017 [3]河北省新河县中医院妇产科,河北新河055650
出 处:《河北医科大学学报》2013年第6期678-682,共5页Journal of Hebei Medical University
基 金:2009年河北省教育厅资助项目(2009148);2009年河北省卫生厅资助项目(20090059);河北省科技支撑计划项目(09276438)
摘 要:目的研究不同温度下间尼索地平(m-nisoldipine,m-Nis)与人血清白蛋白(humanselumalbumin,HSA)相互作用。方法采用紫外光谱法和荧光光谱法在模拟人体生理pH=7.4的0.1mol/L磷酸缓冲溶液中研究不同温度下m-Nis与HSA相互作用的光谱行为。结果m-Nis没有使HSA的构象发生变化。293K、301K和310K时的猝灭常数为分别为1.03×10^5mol/L,1.25×10^5mol/L和1.31×10^5mol/L;结合点数n近似为1,反应的焓变值为3.695H/mol,且△G〈0,△S〉0;m-Nis在HSA上的结合位置距色氨酸残基的距离(r)=2.96nm。结论m-Nis对HSA的荧光猝灭作用不是简单的动态猝灭或静态猝灭,而是形成了1:1的复合物,造成荧光猝灭;m-Nis与HSA之间发生的是非辐射能量转移过程,二者之间的主要作用力是疏水力。Objective To study the interactions between m-nisoldipine (m-Nis) and human serum albumin (HSA). Methods Ultraviolet visible spectroscopy (UV-vis) and fluorescence spectroscopy were used to study the spectral behavior of interactions between m-Nis and HSA under different temperature at the physiological pH (7.4). Results m-Nis did not cause the conformation change of the HAS; The quenching constants at 293K,301K, and 310K were 1.03 × 10^5tooL/L, 1.25× 10^5mol/L, 1.31 × 10^5moL/L, respectively; the number of binding sites (n) was nearly 1. The enthalpy change (AH) was 3. 695 kJ/mol with △G 〈 0 and △S 〉 0; The distance between binding site and tryptophan (r) = 2.96nm. Conclusion The mechanism of fluorescence quenching of m-Nis to HSA was neither static nor dynamic fluorescence quenching, but formed 1: 1 complex and resulted fluorescence quenching. The non-radialization energy transfer process occurred betwwen m-Nis and HAS and the action force was hydrophobic interaction.
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