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Peer-reviewedCC BYResults in Chemistry

Electrochemical sensing of diazinon using a poly(methylene blue)/1,5-diphenylcarbazide-modified glassy carbon electrode in fruit samples

  • Andualem Ejigu1
  • Atnafu Guadie2
  • Mengistu Mulu3
  • Adisie Kassa4
  • Molla Tefera2
4 affiliations
  1. 1Department of Chemistry, College of Natural and Computational Science, Debre Markos University, Ethiopia
  2. 2Department of Chemistry, College of Natural and Computational Science, University of Gondar, Ethiopia; Corresponding authors.
  3. 3Department of Chemistry, College of Natural and Computational Science, University of Gondar, Ethiopia
  4. 4Department of Chemistry, College of Natural and Computational Science, Debre Tabor University, Ethiopia
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Abstract

To detect diazinon, a simple and sensitive MB (methylene blue) and 1,5-DPC (1,5-diphenylcarbazide)-modified glassy carbon electrode (poly(MB)/1,5-DPC/GCE) sensor was developed and characterized by CV and EIS. The sensor showed significantly improved electron transport, with a decrease in charge-transfer resistance from 197.58 Ω for the bare electrode to 66.36 Ω. Besides, the sensor exhibited an irreversible, diffusion-controlled electrochemical reaction with diazinon in acetate buffer at pH 5.0. A wide linear range of 0.01–1.6 μM and a detection limit of 0.093 μM were obtained using differential pulse voltammetry. The sensor demonstrated outstanding reproducibility, stability, low interference, and high selectivity. Recovery studies using fruit samples (papaya, watermelon, mango, and avocado) demonstrated the practical applicability of the proposed technique, with recoveries of 97.3–99.5% and low relative standard deviations (0.12–2.36%), indicating negligible matrix effects and high precision. Finally, the poly(MB)/1,5-DPC/GCE sensor provides a simple, inexpensive, and reliable platform for diazinon detection in food samples, with promising applications in food safety assessment and routine agricultural and environmental monitoring.

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Cite

BibTeXRIS
BibTeX
@article{ejigu2026electrochemical,
  title = {{Electrochemical sensing of diazinon using a poly(methylene blue)/1,5-diphenylcarbazide-modified glassy carbon electrode in fruit samples}},
  author = {Andualem Ejigu and Atnafu Guadie and Mengistu Mulu and Adisie Kassa and Molla Tefera},
  journal = {Results in Chemistry},
  year = {2026},
  month = oct,
  doi = {10.1016/j.rechem.2026.104006},
  url = {https://doi.org/10.1016/j.rechem.2026.104006},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Electrochemical sensing of diazinon using a poly(methylene blue)/1,5-diphenylcarbazide-modified glassy carbon electrode in fruit samples
AU  - Andualem Ejigu
AU  - Atnafu Guadie
AU  - Mengistu Mulu
AU  - Adisie Kassa
AU  - Molla Tefera
PY  - 2026
DA  - 2026/10/30
JO  - Results in Chemistry
DO  - 10.1016/j.rechem.2026.104006
UR  - https://doi.org/10.1016/j.rechem.2026.104006
AB  - To detect diazinon, a simple and sensitive MB (methylene blue) and 1,5-DPC (1,5-diphenylcarbazide)-modified glassy carbon electrode (poly(MB)/1,5-DPC/GCE) sensor was developed and characterized by CV and EIS. The sensor showed significantly improved electron transport, with a decrease in charge-transfer resistance from 197.58 Ω for the bare electrode to 66.36 Ω. Besides, the sensor exhibited an irreversible, diffusion-controlled electrochemical reaction with diazinon in acetate buffer at pH 5.0. A wide linear range of 0.01–1.6 μM and a detection limit of 0.093 μM were obtained using differential pulse voltammetry. The sensor demonstrated outstanding reproducibility, stability, low interference, and high selectivity. Recovery studies using fruit samples (papaya, watermelon, mango, and avocado) demonstrated the practical applicability of the proposed technique, with recoveries of 97.3–99.5% and low relative standard deviations (0.12–2.36%), indicating negligible matrix effects and high precision. Finally, the poly(MB)/1,5-DPC/GCE sensor provides a simple, inexpensive, and reliable platform for diazinon detection in food samples, with promising applications in food safety assessment and routine agricultural and environmental monitoring.
SN  - 2211-7156
ER  -