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<p>The present work focused on developing an electrochemical sensor for the analysis of anionic dye amaranth (AM) by utilizing the electro polymerization technique. The developed bare carbon paste electrode (BCPE) and poly asparagine (AS)-modified CPE (P(AS)MCPE) were utilized for the detection of AM and the surface morphology was studied using linear scanning voltammetry (LSV), scanning electron microscopy (SEM), and cyclic voltammetry (CV). The pH study revealed good oxidation response at pH 7.0 for the modified sensor. The oxidation of AM involved the participation of two electrons and one proton with adsorption-controlled process. The electrode demonstrated a decent limit of quantification (LOQ) and limit of detection (LOD) of 0.382&#xa0;μM and 0.114&#xa0;μM for CV, and 0.267&#xa0;μM and 0.080&#xa0;μM for LSV, respectively. The P(AS)MCPE exhibited high selectivity for AM in the presence of interferents, and also exhibited good stability, reproducibility, and repeatability. The electrode was effectively applied for AM detection in a juice sample, demonstrating good recovery.</p> Graphical Abstract <p></p>

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Development of Poly Asparagine-Modified Carbon-Based Sensor for the Electrochemical Sensing of an Anionic Dye Amaranth

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Harshitha,
  • J. G. Manjunatha,
  • K. P. Moulya,
  • N. Ataollahi,
  • Samar A. Aldossari,
  • V. Nandakumar,
  • D. K. Ravishankar

摘要

The present work focused on developing an electrochemical sensor for the analysis of anionic dye amaranth (AM) by utilizing the electro polymerization technique. The developed bare carbon paste electrode (BCPE) and poly asparagine (AS)-modified CPE (P(AS)MCPE) were utilized for the detection of AM and the surface morphology was studied using linear scanning voltammetry (LSV), scanning electron microscopy (SEM), and cyclic voltammetry (CV). The pH study revealed good oxidation response at pH 7.0 for the modified sensor. The oxidation of AM involved the participation of two electrons and one proton with adsorption-controlled process. The electrode demonstrated a decent limit of quantification (LOQ) and limit of detection (LOD) of 0.382 μM and 0.114 μM for CV, and 0.267 μM and 0.080 μM for LSV, respectively. The P(AS)MCPE exhibited high selectivity for AM in the presence of interferents, and also exhibited good stability, reproducibility, and repeatability. The electrode was effectively applied for AM detection in a juice sample, demonstrating good recovery.

Graphical Abstract