4-alkoxyethoxy-N-octadecyl-1,8-naphthalimide fluorescent sensor for human serum albumin and other major blood proteins: design, synthesis and solvent effect
作者:Song Wei、Yang Sun、Chunlei Tan、Sen Yan、Ping Guo、Xiaoyun Hu、Jun Fan
DOI:10.1002/bio.2384
日期:2013.5
A series of 4-alkoxyethoxy-N-octadecyl-1,8-naphthalimides with intense blue fluorescence were designed and synthesized as polarity and spectrofluorimetric probes for the determination of proteins. In solvents of different polarities, the Stokes shifts of two dyes increased with increasing solvent polarity and fluorescence quantum yields decreased significantly, suggesting that electronic transiting from ground to excited states was π–π* in character. Dipole moment changes were estimated from solvent-dependent Stokes shift data using a solvatochromic method based on bulk solvent polarity functions and the microscopic solvent polarity parameter (). These results were generally consistent with semi-empirical molecular orbital calculations and were found to be quite reliable based on the fact that the correlation of the solvatochromic Stokes shifts with was superior to that obtained using bulk solvent polarity functions. Fluorescence data revealed that the fluorescence quenching of human serum albumin (HSA) by dyes was the result of the formation of a Dye–HSA complex. The method was applied to the determination of total proteins (HSA + immunoglobulins) in human serum samples and results were in good agreement with those reported by the research institute. Copyright © 2012 John Wiley & Sons, Ltd.
设计并合成了一系列具有强烈蓝色荧光的 4-烷氧基乙氧基-N-十八烷基-1,8-萘二甲酰亚胺,作为极性和光谱荧光探针用于蛋白质的测定。在不同极性的溶剂中,两种染料的斯托克斯位移随着溶剂极性的增加而增加,荧光量子产率则显著下降,这表明从基态到激发态的电子传递具有π-π*的特征。根据溶剂极性函数和微观溶剂极性参数 (),采用溶解变色方法从依赖于溶剂的斯托克斯位移数据中估算出偶极矩的变化。这些结果与半经验分子轨道计算结果基本一致,而且溶解变色斯托克斯位移与大体积溶剂极性函数的相关性优于使用大体积溶剂极性函数得到的相关性,因此这些结果非常可靠。荧光数据显示,染料对人血清白蛋白(HSA)的荧光淬灭是染料-HSA 复合物形成的结果。该方法被应用于测定人血清样品中的总蛋白(HSA + 免疫球蛋白),结果与研究机构的报告一致。Copyright © 2012 John Wiley & Sons, Ltd. All Rights Reserved.