Abstract
A simple and sensitive electrochemical determination of l-vanillin (VA), a powerful anti-microbial agent and a commonly employed food preservative was investigated using copper hexacyanoferrate (CuHCF) film modified on 2-mercaptoethylamine functionalized colloidal gold nanoparticles (colloid-Au) graphite-wax composite electrode. As achieved surface modification was characterized using confocal Raman spectroscopy studies which gave rise to peaks at 351, 493, 807 and 2048 cm−1 that corresponds to the characteristics vibrational modes of ν(Fe–C ≡N–Cu), ν(Cu–N), ν(Fe–C) and ν(–C≡N) for the CuHCF film. Further, the elemental analysis investigated using X-ray photoelectron spectroscopy confirms the presence of 2p peaks of Cu (II), Fe(II) and 1 s edge peaks of N for the CuHCF film modified electrode. The modified electrode exhibited a high sensitivity of 0.1817 μA μM−1 at a lower detection potential of 0.68 V towards the VA determination and the limit of detection was observed to be 2.53 × 10−7 M (S/N = 3). The VA content in commercial roasted coffee beans was also examined with the proposed sensor and the results were found to be satisfactory.
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Acknowledgements
PP and SSN acknowledges the financial assistance from University Grants Commission (UGC), New Delhi, India by the way of Project Fellow and Basic Scientific Research (BSR) fellowships and Department of Science & Technology for DST-PURSE program in support of this work.
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Prabhu, P., Babu, R.S. & Narayanan, S.S. Electrochemical determination of l-vanillin using copper hexacyanoferrate film modified gold nanoparticle graphite-wax composite electrode. J Mater Sci: Mater Electron 30, 9955–9963 (2019). https://doi.org/10.1007/s10854-019-01335-8
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DOI: https://doi.org/10.1007/s10854-019-01335-8