Rapid and Selective Determination of Vanillin in the Presence of Caffeine, its Electrochemical Behavior on an Au Electrode Electropolymerized with 3‐Amino‐1,2,4‐triazole‐5‐thiol

Abstract

Electrochemical oxidation of vanillin (VAN) in the presence of caffeine (CAF) was studied on a gold (Au) electrode modified with 3‐amino‐1,2,4‐triazole‐5‐thiol (ATT) film by using differential pulse voltammetry (DPV) and cyclic voltammetry (CV) method. The formation of the ATT film on the Au electrode surface was characterized by the CV, fourier transform infrared spectroscopy (FTIR) and impedance spectroscopy (EIS) methods. A single irreversible oxidation peak of the VAN was obtained by using the CV method. The determination of VAN in the presence of CAF was carried out at pH 4 in Britton Robinson buffer (BR) by the DPV method. Under the optimal conditions, the oxidation peak current was proportional to the concentration of VAN in the range of 1.1 μM to 76.4 μM in the presence of CAF with the correlation coefficient of 0.997 and the detection limit of 0.19 μM (S/N=3). The selective determination of VAN in a commercial coffee sample was carried out with satisfactory results on the ATT‐Au modified electrode.

Selective and Sensitive Determination of Paracetamol and Levodopa with Using Electropolymerized 3,5‐Diamino‐1,2,4‐triazole Film on Glassy Carbon Electrode

“…The nonlinear relationship between ν and the I pa was shown in Figure 6B. This result showed the oxidation process on the 35DT-GC modified electrode was diffusion-controlled [62]. In Figure 6C, I pa values were proportional to ν 1/2 over the range of 0.01-0.5 V s À 1 with linear regression equations: Ipa(μA) = 63.387v 1/ 2 (V s À 1 ) + 0.1076 (R 2 = 0.9987) and Ipa(μA) = 85.638v 1/ 2 (V s À 1 ) + 0.0571 (R 2 = 0.9983), respectively.…”

“…The CV technique gives some information about the changing interface of the electrode after modification of the surface [62]. The CV method was used to determine the efficiency of the fabrication of modified electrode and the effective surface areas of bare GC and 35DT-GC electrodes.…”

Novel porous iron phthalocyanine based metal–organic framework electrochemical sensor for sensitive vanillin detection

“…Therefore, it can be concluded that the oxidation process of vanillin at FePc MOF/GCE involves two protons and two electrons, which is consistent with previously reported results. [50][51][52] The proposed mechanism for vanillin oxidation is shown in Scheme 2.…”

Surfactant and Polymer Composite Modified Electrode for the Sensitive Determination of Vanillin in Food Sample

“…Table 1 [27–33] gives the comparison of VA sensors with proposed sensor. PTOMCNPE provides lower LOD as compared to gold electrode/ 3‐amino‐1,2,4‐triazole‐5‐ thiol, [28] Cajeput tree bark derived activated carbon/GCE, [29] arginine/graphene/GCE, [30] screen‐printed electrode/CNT, [31] and graphene paste/CTAB, [32] PNMCNTPE [34] and near LOD to T3T−Au/GE [33] . The developed sensor is relatively simple and low cost with high sensitivity.…”