Electrochemical Determination of Ascorbic Acid Based on AgNPs/PVP‐Modified Glassy Carbon Electrode

Abstract

The electrochemical determination of ascorbic acid was carried out at the surface of glassy carbon electrode (GCE) modified by silver nanoparticles (AgNPs):Polyvinylpyrrolidone (PVP). Nanocomposite was evaluated by fourier transform infrared spectroscopy, zeta potential, and X‐ray diffraction. Also, the surface morphologies of the developed electrode were investigated by scanning electron microscopy, and profilometer. The electrochemical performance of AgNPs/PVP/GCE was studied with cyclic voltammetry and electrochemical impedance spectroscopy measurements. The electrochemical studies demonstrated that the electrode had a large surface. Compared with the bare GCE, PVP/GCE, and AgNPs/GCE, the AgNPs/PVP‐modified GCE showed excellent performance for the electrochemical determination of ascorbic acid. At the optimized conditions of differential pulse voltammetry in pH 6.0 of phosphate buffer solution, the modified electrode allowed the determination of ascorbic acid on a potential of 0.54 V vs. Ag/AgCl. Under optimized conditions, the low detection limit of 0.047 μM and working range of 0.2‐1200 μM were obtained at the AgNPs/PVP/GCE. The AgNPs/PVP/GCE allowed to obtain highest peak current values at low concentrations. Moreover, the fabricated electrode also exhibited good repeatability, reproducibility, and stability. The developed electrode was successfully enforced for the analysis of ascorbic acid in banana, kiwi fruit, mango, and pineapple.

Selective Voltammetric Detection of Ascorbic Acid from Rosa Canina on a Modified Graphene Oxide Paste Electrode by a Manganese(II) Complex

“…The relative standard deviation was measured at two levels of concentration mass of AA, i.e., 45 μg L −1 and 158 μg L −1 and calculated to be 4.2 % and 3.8%, respectively, values indicating the good reproducibility of the proposed assay. The linear detection region of AA in the present study is in several cases better than that determined by the corresponding electrochemical techniques in the literature [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 45 ] On the other hand, the detection limit of the current analytical AA detection methodology is better compared to the majority of those determined with the other corresponding electrochemical techniques available in the literature, with the exception that it is in the same magnitude of Zhao et 2019 [ 20 ], Kaçar and Erden 2020 [ 2 ], Broncová et al 2021 [ 34 ], Pekin et al [ 45 ], as it can be seen from Table 1 .…”

“…Meanwhile, for the electrochemical determination of AA, electrodes with modified surfaces have been widely used, overlapping the fulling effect due to oxidation that may occur on the conventional electrode surfaces [ 6 ]. Carbon paste (CPE) [ 12 , 19 ] and glassy carbon (GCE) [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ] modified electrodes are the most commonly used for AA analysis in the available literature. Moreover, Pt modified electrodes with 3,4-diaminobenzoic acid and neutral red [ 34 ] or screen-printed electrodes (SPE) [ 35 , 36 , 37 ].…”

Development of a voltammetric method for the determination of rapamycin in pharmaceutical samples at pretreated pencil graphite electrode

“…Tolerance was defined as the amount of foreign species that produced a change of peak current not exceeding ±10% in the change of rapamycin oxidation peak current. [ 28 ] The results showed that 750‐fold of ions, such as Na + , K + , Fe 2+ , Cu 2+ , Mg 2+ , Cl − , PO 4 3− , and NO 3 − did not interfere with rapamycin. Two hundred‐fold of sugars, such as fructose, glucose, and sucrose, 50‐fold of ascorbic, and some flavonoids such as morin, quercetin, and rutin had a negligible effect on oxidation peak signal of rapamycin with peak current deviations below 10.0%.…”

Glassy Carbon Electrodes Decorated with HgO/CNT Nanocomposite and Modified with a Conducting Polymer Matrix for Enzyme‐Free Ascorbic Acid Detection

“…When ascorbic acid is ChemistrySelect transformed to dehydro-ascorbic acid and H 2 O 2 in the occurrence of oxygen, H 2 O 2 is changed into oxygen and two protons upon released of two electrons. [13][14][15][16] The electrochemical signals were obtained because of the two electrons emitted during the detection of ascorbic acid by using the suggested sensor (GCE/HgO.CNT NCs/Nf). Fabricated and harmonized electrodes with HgO.CNT NCs were used as a sensor to signify the biological molecules (i. e., organic acid), which are considered useful in medical science.…”