Electrochemical sensing of diazinon using a poly(methylene blue)/1,5-diphenylcarbazide-modified glassy carbon electrode in fruit samples
Year: 2026
Type: article
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.
Source: Results in Chemistry
Language: English
Subfield: Analytical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,870
OpenAlex ID: W7223155908