稀土螯合物BCPDA-Eu3+标记蛋白质研究

通过自制的双功能螯合剂 4 ,7 二氯磺基苯 1,10啡啉 2 ,9二羧酸 (BCPDA)标记牛血清白蛋白(BSA)实验 ,对于BCPDA标记蛋白质的条件进行研究。结果表明 :BCPDA在温和的条件下能与蛋白质反应 ,并在一定条件下与铕离子形成稳定的BSA BCPDA Eu3 标记物。利用自建的分析方法 ,测定了标记过程的有关参数。并对标记物的某些光学特性进行了研究。

Study of Rare Earth Bifunctional Chelate BCPDA-Eu3+ Labeling Protein

The authors labeled bovine serum albumin (BSA) with a new europium chelator 4,7-bis(chlorosulfophenyl)-1,10-phenanthroline-2,9-dicarboxylic acid (BCPDA) which was synthesized by solid phase time-resolved fluorescence immunoassay (TRFIA) technology. The process of BCPDA-labeling-BSA reaction was studied. Using Coomassie brilliant blue method, concentrations of BSA and BCPDA were determined in BCPDA-BSA labeled sample. The labeling reaction condition was studied. Labeling ratio and protein labeling recovery were calculated. BCPDA-BSA-Eu 3 complex has a very large Stokes shift (270 nm) and can emit very strong fluorescence band at 611.2 nm which is very narrow (10 nm). BCPDA-BSA-Eu 3 complex exhibits very long fluorescence lifetimes by the experiment demonstration. Also, BCPDA and protein-BCPDA-Eu 3 complex is relatively stable.