Fractional Analysis of Ascorbic Acid and Dopamine by Copper Nanoparticles Electrodeposited onto Gold Electrode

Abstract

The electrochemical behavior of ascorbic acid (AA) and dopamine (DA) at copper nanoparticles modified polycrystalline gold electrode (nano-Cu/Au) has been studied using cyclic voltammetry. The modified nano-Cu/Au electrodes have been assembled using cyclic voltammetric techniques. Nano-Cu/Au have been successfully differentiated the electrochemical response of the two species, in contrary to the bare polycrystalline gold electrode at which the electrochemical response of the two species were overlapped, and only one anodic peak for the two species is obtained. At the optimized conditions, both species have been simultaneously determined using square wave voltammetry. Acceptable rectilinear ranges for both species have been obtained with correlation coefficients of 0.998 and 0.995 for DA and AA, respectively. The limits of detection and quantification (LOD and LOQ) were calculated and found to be 1.816 and 6.05 for DA and 34.57 and 115.25 for AA. The relative standard deviation (RSD) for both DA and AA were deliberated to be 2.04 and 0.376 %, respectively.

Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode

“…Thus, it is usually difficult to separate the responses of AA and DA at bare electrodes [13] such as GC, gold, and platinum electrodes. In recent years, several strategies to separate the electrochemical response of the two species while retaining the sensitivities have been introduced [14][15][16][17][18][19][20][21][22][23]. It includes the modification of gold and GC electrodes with either an organic or inorganic modifier.…”