Interaction of Co（ll） with Bovine Serum Albumin under UV C Irradiation

The interaction of Co（Ⅱ） with BSA under UV C （253.7 nm） irradiation under physiological conditions has been studied by UV-vis spectrum, ultraviolet second-derivative spectroscopy and fluorescence spectrum. The quenching rate constant kq and the association constant Ka were calculated according to Stern-Volmer equation based on the quenching of the fluorescence of BSA by Co（Ⅱ）.     

紫外照射下Pb(Ⅱ)与牛血清白蛋白的相互作用研究

通过紫外吸收光谱法、紫外二阶导数光谱法和荧光光谱法研究了生理pH值条件、紫外照射(UV C 253.7 nm)下Pb(Ⅱ)与牛血清白蛋白(BSA)的相互作用。紫外光谱和紫外二阶导数光谱显示紫外光照射改变了蛋白质中氨基酸残基的微环境。Stern-Volmer方程和Lineweaver-Burk方程分析表明,经紫外光照射后,Pb(Ⅱ)对BSA的荧光猝灭作用依然为静态猝灭作用,且没有改变其强结合位点的位置。受紫外照射过的BSA加入Pb(Ⅱ)后,BSA与Pb(Ⅱ)的结合常数(K_S)随着照射时间的延长而逐渐降低;而BSA与Pb(Ⅱ)先混合后照射时,结合常数(K_S)随着照射时间的延长却逐渐升高。