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<p>Herein, the development of effective electrochemical method for the determination of ascorbic acid (AA) as an antioxidant was achieved by modifying a screen-printed carbon electrode (SPCE) with cobalt nanosheets/reduced graphene oxide (Co NSs/rGO) nanocomposite. Owing to the combination of the unique properties of rGO and Co NSs, the Co NSs/rGO/SPCE exhibited good performance (a lower overpotential and a higher current response) towards the oxidation of AA than unmodified SPCE. Under optimal conditions, the voltammetric response of the Co NSs/rGO/SPCE sensor was highly linearly correlated with the AA concentrations range of 0.03–975.0&#xa0;µM with the limit of detection of 0.01&#xa0;µM. Also, the Co NSs/rGO/SPCE sensor demonstrated discrimination of the peak oxidation potentials of ascorbic acid, salicylic acid, and glutathione in the solution. It is worth noting that the simultaneous determination of these species was provided at the surface of modified SPCE. Furthermore, the Co NSs/rGO/SPCE sensor presented good capability to investigate the ascorbic acid, salicylic acid, and glutathione levels in real samples with satisfactory recoveries.</p> Graphical abstract <p></p>

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Evaluating the electrochemical detection of three antioxidants, ascorbic acid, salicylic acid, and glutathione by using a screen-printed carbon electrode modified with nanocomposite of cobalt nanosheets anchored on reduced graphene oxide

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Somayeh Tajik,
  • Zahra Dourandish,
  • Fariba Garkani Nejad,
  • Hadi Beitollahi

摘要

Herein, the development of effective electrochemical method for the determination of ascorbic acid (AA) as an antioxidant was achieved by modifying a screen-printed carbon electrode (SPCE) with cobalt nanosheets/reduced graphene oxide (Co NSs/rGO) nanocomposite. Owing to the combination of the unique properties of rGO and Co NSs, the Co NSs/rGO/SPCE exhibited good performance (a lower overpotential and a higher current response) towards the oxidation of AA than unmodified SPCE. Under optimal conditions, the voltammetric response of the Co NSs/rGO/SPCE sensor was highly linearly correlated with the AA concentrations range of 0.03–975.0 µM with the limit of detection of 0.01 µM. Also, the Co NSs/rGO/SPCE sensor demonstrated discrimination of the peak oxidation potentials of ascorbic acid, salicylic acid, and glutathione in the solution. It is worth noting that the simultaneous determination of these species was provided at the surface of modified SPCE. Furthermore, the Co NSs/rGO/SPCE sensor presented good capability to investigate the ascorbic acid, salicylic acid, and glutathione levels in real samples with satisfactory recoveries.

Graphical abstract