Abstract
The electrocatalytic oxidation of ascorbic acid (AA) has been studied by p-aminophenol modified carbon nanotubes paste electrode (APMCNTPE). Cyclic voltammetry (CV) and chronoamperometry were used to investigate the suitability of AP as a mediator for the electrocatalytic oxidation of AA in aqueous solution. The oxidation of AA occurs at a potential about 320 mV less positive than with the unmodified carbon paste electrode at pH 7.0. The catalytic reaction rate constant, kh was calculated (2.257 × 103 M−1s−1) using chronoamperometry. The differential pulsevoltammetric (DPV) peak currents of the electrode increased linearly with the corresponding AA concentration in the range of 2.0 × 10−7 M – 1.2 × 10−4 M with a detection limit of 8.0 × 10−8 M. The influence of pH and potential interfering substances on the determination of AA were studied. Finally, the proposed method was also examined as a selective, simple and precise electrochemical sensor for the determination of AA in real samples such as fruit juices and fresh vegetable juice.
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The authors wish to thank Science and Research Branch, Mazandaran, Islamic Azad University, for their support.
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Gheibi, S., Karimi-Maleh, H., Khalilzadeh, M.A. et al. A new voltammetric sensor for electrocatalytic determination of vitamin C in fruit juices and fresh vegetable juice using modified multi-wall carbon nanotubes paste electrode. J Food Sci Technol 52, 276–284 (2015). https://doi.org/10.1007/s13197-013-1026-7
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DOI: https://doi.org/10.1007/s13197-013-1026-7