四碘荧光素与牛血清白蛋白相互作用的荧光光谱研究

用荧光光谱法研究了四碘荧光素与牛血清白蛋白的结合反应。测得该反应的结合常数为2.65×105 L·mol-1，结合数n=0.86，探讨了它们的相互作用机理。四碘荧光素主要以疏水作用力与牛血清白蛋白相互作用，同时，牛血清白蛋白的存在会增强四碘荧光素的发光，且强度的变化在一定范围内与牛血清白蛋白的浓度成正比。以此为基础在pH 8.64的条件下建立了测定牛血清白蛋白的方法。该法的线性范围为8×10-7～9×10-6 mol·L-1，精密度为3.4%，检出限9.88×10-8 mol·L-1。

Study on the Interaction of Tetraiodofluorescein and Bovine Serum Albumin by Fluorimetry

The binding reaction of tetraiodofluorescein with bovine serum albumin i n aqueous solution was studied by fluorimetry.The binding constant is 2.65 x 10(5) L x mol(-1), the equilibrium constant is 5.7 x 10(4) L x mol(-1), and the binding number is 0.86. The research results of binding model indicate that the hydrophobic force was the main binding force. The presence of BSA can increase the fluorescence intensity of TIF. And the deltaF(F-F0) is linear to the concentration of BSA in a certain range, so the first analytical application was proposed. The linear dynamic range (LDR) was 8 x 10(-7) - 9 x 10(-6) mol x L(-1), the limit of detection (LOD) was 9.88 x 10(-8) mol x L(-1), and the relative standard deviation (RSD) was 3.4%.