人血清白蛋白
水溶液中的金属离子
化学
圆二色性
金属
荧光
猝灭(荧光)
罗丹明B
氢键
构象变化
离子
罗丹明
吸收(声学)
光化学
分子
结晶学
立体化学
材料科学
生物化学
有机化学
物理
复合材料
催化作用
光催化
量子力学
作者
Baicun Li,Yinhe Sun,Jin‐Jian Lu,Xin Peng
标识
DOI:10.1080/03601234.2021.1873030
摘要
The binding of rhodamine B (RB) to human serum albumin (HSA) in the absence and presence of Cu2+ or Fe3+ under simulated physiological conditions was studied by using various biophysical methods for the first time. The results showed that the interaction between HSA and RB could spontaneously result in the formation of HSA-RB complex (namely, static quenching mechanism) through hydrophobic interactions and hydrogen bonds irrespective of the absence or presence of metal ions. The presence of metal ions led to the reduction of binding affinity of RB to HSA compared with no metal ions, which might result from the conformational change of HSA caused by the binding of metal ions. Furthermore, the analysis of UV-vis absorption, circular dichroism, synchronous fluorescence and three-dimensional fluorescence experiments demonstrated that the addition of RB induced conformational and microenvironmental changes of HSA without and with metal ions. In short, this work will be helpful to in-depth understand the transport mechanism and biological effect of RB and the effect of metal ions on the interaction of HSA-RB in vivo.
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