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<p>This research describes the preparation of a poly (valine)-modified multiwalled carbon nanotube carbon paste electrode (PVL-MWCNT/CPE) via facile electro-polymerization and grinding methods. Surface morphology, elemental composition, functional groups, and surface area of the modified electrode were analyzed using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), and cyclic voltammetry (CV). The modified electrode exhibited a strong electrocatalytic effect towards caffeic acid (CA) sensing in a 0.1&#xa0;M phosphate buffer solution (PBS, pH 6.0), with increased peak current and reduced overpotential. For the calibration curve, differential pulse voltammetry (DPV) offered an enhanced peak in a linear range from 4.0 µM to 20 µM, with a low detection limit of 0.072 µM, indicating high sensitivity. The sensor also demonstrated good repeatability, reproducibility, and stability. The practical applicability of the sensor was confirmed by direct detection of low concentration CA in green tea samples with satisfactory outcomes.</p> Graphical Abstract <p></p>

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Improved Electrochemical Sensing of Caffeic Acid at a Poly (Valine)-Modified Multiwalled Carbon Nanotube Carbon Paste Electrode

  • 期刊论文

  • 发表日期：

    2026年7月2日

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  • Girish Tigari,
  • K. R. Shashank,
  • J. G. Manjunatha,
  • B. Kanthappa,
  • K. P. Moulya

摘要

This research describes the preparation of a poly (valine)-modified multiwalled carbon nanotube carbon paste electrode (PVL-MWCNT/CPE) via facile electro-polymerization and grinding methods. Surface morphology, elemental composition, functional groups, and surface area of the modified electrode were analyzed using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), and cyclic voltammetry (CV). The modified electrode exhibited a strong electrocatalytic effect towards caffeic acid (CA) sensing in a 0.1 M phosphate buffer solution (PBS, pH 6.0), with increased peak current and reduced overpotential. For the calibration curve, differential pulse voltammetry (DPV) offered an enhanced peak in a linear range from 4.0 µM to 20 µM, with a low detection limit of 0.072 µM, indicating high sensitivity. The sensor also demonstrated good repeatability, reproducibility, and stability. The practical applicability of the sensor was confirmed by direct detection of low concentration CA in green tea samples with satisfactory outcomes.

Graphical Abstract