金-石墨烯修饰电极上血红蛋白
首发时间:2010-01-15
摘要:构置了血红蛋白(Hb)/离子液体(IL)/金-石墨烯复合纳米材料(Au-GE)复合膜修饰的碳陶瓷电极(Hb/IL/Au-GE/CCE),研究了在该复合膜修饰电极上Hb的直接电化学和电催化性质,并建立了H2O2的伏安测定新方法。结果表明,Hb在Hb/IL/Au-GE/CCE电极循环伏安图上出现了一对准可逆的氧化还原峰,式量电位 E°’为-0.304V (vs. SCE );该修饰电极的米氏常数为16.6μmol/L,Hb的还原峰电流与H2O2浓度在2.7×10-7 ~ 2.5×10-4 mol/L(r2= 0.9926)范围内呈线性关系,检出限为1.1×10-7 mol/L。
关键词: 电化学传感器 电催化 直接电化学 石墨烯 过氧化氢 血红蛋白
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Direct electrochemistry of hemoglobin based on Au-GE
Abstract:A new electrochemical biosensor was structured for determination of hydrogen peroxide (H2O2) based on the hemoglobin (Hb)/ room temperature ionic liquid(IL)/Gold –graphene nanocomposite material(Au-GE)/ carbon ceramic electrode(CCE)(Hb/IL/Au-GE/ CCE)modified electrode. The direct electrochemistry and electrocatalytic of hemoglobin was studied and a new cyclic voltammetry method formed. The results showed that Hb had a pair of well-defined, quasi-reversible redox peaks on Hb/IL/Au-GE/ CCE. The formal potential E°’ was -0.304 V (vs. SCE). It also showed good electrocatalytic ability to the reduction of H2O2 with the linear 2.7×10-7~2.5×10-4 mol/L(r2= 0.9926) and the detection limit was 1.1×10-7 mol/L. The apparent Michaelis-Menten constant ( ) was estimated to be 16.6μmol/L.
Keywords: Electrochemical sensor Electrocatalytisis Direct electrochemistry graphene Hydrogen peroxide Hemoglobin
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