CAJ | 학술논문

将玻碳电极(GCE)放入L-苯丙氨酸(LP)和氧化石墨烯(GO)的混合液中进行循环伏安扫描聚合，该过程中GO通过电化学还原成石墨烯(ERGO)，因而得到聚L-苯丙氨酸/石墨烯修饰电极(PLP-ERGO/GCE)，该电极对左旋多巴(LDA)具有较好的催化能力和较快的电子传递速率。利用循环伏安法(CV)和差分脉冲伏安法(DPV)探究了LDA在该电极上的电化学行为，LDA在电极表面的氧化还原过程受扩散控制。在最佳实验条件下，LDA在0.478 V处产生一个氧化峰。采用DPV法测定LDA的线性范围为7.50×10-6~2.50×10-4 mol/L，检出限为7.5×10-7 mol/L。用于样品中左旋多巴的测定，结果满意。
장파탄전겁(GCE)방입L-분병안산(LP)화양화석묵희(GO)적혼합액중진행순배복안소묘취합，해과정중GO통과전화학환원성석묵희(ERGO)，인이득도취L-분병안산/석묵희수식전겁(PLP-ERGO/GCE)，해전겁대좌선다파(LDA)구유교호적최화능력화교쾌적전자전체속솔。이용순배복안법(CV)화차분맥충복안법(DPV)탐구료LDA재해전겁상적전화학행위，LDA재전겁표면적양화환원과정수확산공제。재최가실험조건하，LDA재0.478 V처산생일개양화봉。채용DPV법측정LDA적선성범위위7.50×10-6~2.50×10-4 mol/L，검출한위7.5×10-7 mol/L。용우양품중좌선다파적측정，결과만의。
The poly (L-phenylalanine)-graphene modified glassy carbon electrode was fabricated using cyclic voltammetry. In this process, graphene oxide was electrochemically reduced. The modified electrode has the fast electron transfer rate and good electrocatalytic ability for levodopa. The electrochemical behavior of levodopa was studied by cyclic voltammetry and differential pulse voltammetry and the oxidation reduction of levodopa was controlled by diffusion. Under optimal experiment conditions, the sensitive oxidation peak of levodopa was at 0.478 V. The calibration curves for levodopa were obtained in the range of 7.5 0 × 10-6~2.5 0 × 10-4 mol/L by differential pulse voltammetry with the detection limit of 7.5 × 10-7 mol/L. This method had been successfully applied to the determination of levodopa in the sample with satisfactory results.