【摘要】 采用电化学氧化法制备了L-赖氨酸单分子层修饰玻碳电极,研究了多巴胺(DA)和抗坏血酸(AA)在该电极上的电化学行为。结果表明,L-赖氨酸单分子层修饰玻碳电极不仅能改善多巴胺和抗坏血酸的电化学行为,而且能将多巴胺和抗坏血酸二者在裸电极上的完全重叠的单氧化峰分开成为两个完全独立的氧化峰,循环伏安(CV)图上峰间距为507mV,差分脉冲伏安(DPV)图上峰间距为460mV,由此可实现在AA的共存下对样品中的DA进行选择性测定。更多还原

【Abstract】 A covalent modified glassy carbon electrode with L_Lysine (Lys/GCE) has been fabricated via an electrochemical oxidation procedure. It is used to electrochemically detect dopamine (DA) and ascorbic acid (AA). The results indicated that L_Lysine monolayer on the surface of glassy carbon electrode (GCE) not only can improve the electrochemical behaviors of DA and AA, but also can resolve the mixed voltammetric response of DA and AA at GCE into two well_defined voltammetric peaks. The separation between the two peak potentials were about 507mV in cyclic voltammetry (CV) and 460mV in differential pulse voltammetry (DPV), respectively, which were large enough for the determination of DA in the presence of AA.更多还原