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首页> 外文期刊>Applied optics >Changes in porphyrin nonlinear absorption owing to interaction with bovine serum albumin
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Changes in porphyrin nonlinear absorption owing to interaction with bovine serum albumin

机译：与牛血清白蛋白相互作用导致卟啉非线性吸收的变化

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摘要

The changes in the nonlinear absorption of meso-tetrakis (p-sulfonatophenyl) porphyrin (TPPS_(4)) caused by its binding to bovine serum albumin (BSA) were investigated in aqueous solutions. The nonlinear absorption depended on the excitation wavelength and pH. It is noteworthy that, for excitation at 640 nm, saturated absorption was observed in a TPPS_(4) solution (pH 4.0), whereas reverse saturated absorption occurred for all pH values from 4.0 to 7.0 when BSA was added to TPPS_(4). The presence of BSA also initiates an increase in the saturation intensity and a reduction of the nonlinear absorption coefficient. The interpretation of the results based on the binding of TPPS_(4) to BSA is corroborated by linear absorption, fluorescence, light scattering, and flash-photolysis data.
机译：研究了水溶液中牛血清白蛋白（BSA）结合引起的中四（对-磺基苯基）卟啉（TPPS_（4））非线性吸收的变化。非线性吸收取决于激发波长和pH。值得注意的是，对于在640 nm处激发，在TPPS_（4）溶液（pH 4.0）中观察到饱和吸收，而当将BSA添加到TPPS_（4）中时，从4.0到7.0的所有pH值都发生了反向饱和吸收。 BSA的存在还引发饱和强度的增加和非线性吸收系数的减小。线性吸收，荧光，光散射和闪光光解数据证实了基于TPPS_（4）与BSA结合的结果解释。

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