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Voltammetric behavior of Mammeisin (MA) at a glassy carbon electrode and its interaction with Bovine Serum Albumin (BSA)
Bioelectrochemistry ( IF 5 ) Pub Date : 2017-09-07 , DOI: 10.1016/j.bioelechem.2017.08.008
Jules-Blaise Mabou Leuna , Sergeot Kungo Sop , Suzanne Makota , Evangeline Njanja , Thiery Christophe Ebelle , Anatole Guy Azebaze , Emmanuel Ngameni , Achille Nassi

The electrochemical oxidation of Mammeisin (MA) was studied in a solution containing acetone and 0.1 M phosphate buffer + 0.1 M KCl (pH = 5.3) at a glassy carbon electrode (GCE), using cyclic (CV) and square wave voltammetry (SWV). MA showed a quasi-reversible process, which is pH dependent and that involves the exchange of two electrons and two protons. The oxidation product was adsorbed by the electrode surface to form a film that blocks active sites over repetitive cyclic. Moreover, the interaction of MA and bovine serum albumin (BSA) was studied by CV and SWV at different pHs (5.4, 7.2, 9.5). As a result of the affinity binding with BSA, electrochemically inactive complex was formed. In addition, the oxidation potential of MA in the presence of BSA depends on the pH. The diffusion coefficients of both free and bound MA were estimated from the cyclic voltammetry data using the method developed by Randles-Sevich (Df = 9.85 × 10− 5 cm2 s− 1 and Db = 1.27 × 10− 9 cm2 s− 1) and the binding constant of MA-BSA complex, K = 3.47 × 102 L mol− 1, was obtained.



中文翻译:

Mammeisin(MA)在玻璃碳电极上的伏安行为及其与牛血清白蛋白(BSA)的相互作用

使用循环(CV)和方波伏安法(SWV)在玻碳电极(GCE)上在含丙酮和0.1 M磷酸盐缓冲液+ 0.1 M KCl(pH = 5.3)的溶液中研究了Mammeisin(MA)的电化学氧化。MA显示出准可逆过程,该过程是pH依赖性的,并且涉及两个电子和两个质子的交换。氧化产物被电极表面吸附,形成一层膜,该膜阻挡了重复循环中的活性位。此外,通过CV和SWV在不同的pH值(5.4、7.2、9.5)研究了MA与牛血清白蛋白(BSA)的相互作用。由于与BSA的亲和力结合,形成了电化学惰性的复合物。另外,在BSA存在下MA的氧化电位取决于pH。˚F  = 9.85×10 -第5 厘米2个 小号- 1和d b  = 1.27×10 - 9 厘米2个 小号- 1)和MA-BSA的复合物的结合常数,K = 3.47×10 2 大号摩尔- 1,得到。

更新日期:2017-09-07
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