Electrocatalytic Oxidation of Some Carbohydrates by Nickel/Poly(o‐Aminophenol) Modified Carbon Paste Electrode

Abstract

This study investigates the electrocatalytic oxidation of glucose and some other carbohydrates on nickel/poly(oaminophenol) modified carbon paste electrode as an enzyme free electrode in alkaline solution. Poly(o-aminophenol) was prepared by electropolymerization using a carbon paste electrode bulk modified with o-aminophenol and continuous cyclic voltammetry in HClO 4 solution. Then Ni(II) ions were incorporated to electrode by immersion of the polymeric modified electrode having amine group in 1 M Ni(II) ion solution. Cyclic voltammetric and chronoamperometric experiments were used for the electrochemical study of this modified electrode; a good redox behavior of Ni(OH) 2 /NiOOH couple at the surface of electrode can be observed, the capability of this modified electrode for catalytic oxidation of glucose and other carbohydrates was demonstrated. The amount of a and surface coverage (G*) of the redox species and catalytic chemical reaction rate constant (k) for each carbohydrate were calculated. Also, the electrocatalytic oxidation peak currents of all tested carbohydrates exhibit a good linear dependence on concentration and their quantification can be done easily.

Pulse electrodeposited nickel-indium tin oxide nanocomposite as an electrocatalyst for non-enzymatic glucose sensing

“…The detection limit was estimated to be 3.74 μM at a signal-tonoise ratio of 3. As shown in Table 1, the detection potential, linear range, detection limit and sensitivity are lower than that in previous reports [20,[43][44][45][46][47][48][49]. …”

Nonenzymatic glucose sensor based on renewable electrospun Ni nanoparticle-loaded carbon nanofiber paste electrode

“…4A shows the amperometric responses of the NiCFP electrode to successive injection of glucose at low concentrations. As indicated, fast response with 95% of the steady-state current achieved within 5 s could be observed, and the limit of detection was 1 M, which is lower than that obtained at the Ni complex (Ojani et al, 2008), CNT-based composite (Deng et al, 2008;Chen et al, 2008) and alloy modified electrodes . The calibration plot for glucose determination was linear in a wide range from 2 M to 2.5 mM with a slope of 3.3 A mM −1 (sensitivity) and a correlation coefficient of 0.9997 (Fig.…”

“…Among these relatively low-cost catalysts, Ni-based materials were extensively investigated for electrocatalytic oxidation of many important analytes besides carbohydrates (Reim and Effen, 1986;Casella and Gatta, 2001;You et al, 2003;Ojani et al, 2008), such as insulin (Salimi et al, 2007), aspirin (McAuley and Wildgoose, 2008), ethanol (Casella et al, 1993;Weng et al, 2004) and amino acids (Deo et al, 2004). The oxidation processes are catalyzed by the Ni-based materials through the formation of a high-valent, oxyhydroxide species (NiOOH) in alkaline medium.…”

Voltammetric Determination of Chlorpheniramine Maleate Based on the Enhancement Effect of Sodium‐dodecyl Sulfate at Carbon Paste Electrode

“…Differential pulse voltammograms obtained with increasing amounts of CPM showed that the peak current increased linearly with increasing concentration, as shown in Figure. 6. Using the optimum conditions described previously, linear calibration curves were obtained for CPM in the range of 8.0 10 À6 to 1.0 10 À4 M (Figure 6 Inset) [24]. The linear equation was I p = 4.7133 + 1.868 (r = 0.9891, C is in mM).…”