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Poly-terephthalic acid modified pencil graphite electrode for the electrochemical determination of vitamin B6

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Abstract

Reporting for the first time, a poly-terephthalic acid modified pencil graphite electrode (PGE) for the quantitative detection of pyridoxine or vitamin B6 (VB6) from pharmaceutical samples. The developed sensor was characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, infrared spectroscopy, and electrochemical impedance spectroscopy. Cyclic and differential pulse voltammetric techniques were used for the investigation of the electro-oxidation of VB6 on the electrode. The characteristic oxidation peak of VB6 was found to be located at a potential of 0.58 V in the supporting electrolyte solution, phosphate buffer solution with pH 7. This novel electrochemical sensor has a linear range of 0.1–3500 μM with an LOD of 0.0102 μM. As a result, the fabricated electrode can be utilized for pharmaceutical analysis.

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Data availability

The datasets generated and/or analyzed during the current study are not publicly available as they are the intellectual property of the institution but are available from the corresponding author on reasonable request.

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Acknowledgements

Authors acknowledge Amrita Vishwa Vidyapeetham, Amritapuri campus, for the internal support provided to carry out the research work and Amrita Institute of Medical Science, Kochi, for the morphological characterization of the developed sensor. Electrochemical impedance spectroscopy was done at the Department of Applied Chemistry, Cochin University of Science and Technology.

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BS1 designed and conducted the experiment, collected data, and wrote the main manuscript. GS and MGG assisted with the experiment and edited the manuscript. SA oversaw the experiments. MG provided technical guidance. BS2 gave conceptual and technical guidance. All authors reviewed the manuscript.

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Correspondence to Beena Saraswathyamma.

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Sajeevan, B., Sreelekshmi, Gopika, M.G. et al. Poly-terephthalic acid modified pencil graphite electrode for the electrochemical determination of vitamin B6. Ionics 29, 4389–4396 (2023). https://doi.org/10.1007/s11581-023-05156-y

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