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Electrochemical Behavior of Ascorbic Acid at a 2,2'-[3,6-Dioxa-1,8-octanediylbis(nitriloethylidyne)]-bis-hydroquinone Carbon Paste Electrode

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Abstract

Electrocatalytic oxidation of ascorbic acid (AA) at a carbon paste electrode, chemically modified 2,2'-[3,6-dioxa-1,8-octanediylbis(nitriloethylidyne)]-bis-hydroquinone, was thoroughly investigated. The results of cyclic voltammetry, double potential-step chronoamperometry, linear sweep voltammetry and differential pulse voltammetry (DPV) studies were used for the prediction of the mechanism of electrochemical oxidation of AA mediated with 2,2'-[3,6-dioxa-1,8-octanediylbis(nitriloethylidyne)]-bis-hydroquinone at the surface of the modified electrode. The diffusion coefficient (D = 2.45 × 10-5 cm2 s-1) and the kinetic parameters such as the electron transfer coefficient (α = 0.34) were also determined. The results of DPV using the 2,2'-[3,6-dioxa-1,8-octanediylbis(nitriloethylidyne)]-bis-hydroquinone-modified electrode were applied in a highly sensitive determination of AA in drug samples. A linear range of 3.0 × 10-6 – 1.2 × 10-4 M and the detection limit (3σ) 3.8 × 10-7 M were obtained for DPV determination of AA in buffered pH 7.00 solutions (0.1 M phosphate buffer).

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Yazd University, Yazd, Iran

    Zahra Taleat, Mohammad Mazloum Ardakani, Hadi Beitollahi & Hamid Reza Zare

  2. Department of Chemistry, Faculty of Science, Kashan University, Kashan, Iran

    Hossein Naeimi & Maryam Nejati

Authors
  1. Zahra Taleat
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  2. Mohammad Mazloum Ardakani
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  3. Hossein Naeimi
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  4. Hadi Beitollahi
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  5. Maryam Nejati
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  6. Hamid Reza Zare
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Correspondence to Mohammad Mazloum Ardakani.

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Taleat, Z., Ardakani, M.M., Naeimi, H. et al. Electrochemical Behavior of Ascorbic Acid at a 2,2'-[3,6-Dioxa-1,8-octanediylbis(nitriloethylidyne)]-bis-hydroquinone Carbon Paste Electrode. ANAL. SCI. 24, 1039–1044 (2008). https://doi.org/10.2116/analsci.24.1039

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  • DOI: https://doi.org/10.2116/analsci.24.1039

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