A novel cellulosic non‐enzymatic nanosensor based on carbon shell silver (Ag@C) nanoparticles for colorimetric detection of Chlorpyrifos in agricultural products

Abstract

Background: The precise detection and quantification of organophosphorus pesticides are highly required to ensure food safety. The non-enzymatic nanosensor technology has appeared as an efficient method to replace conventional analytical techniques of pesticide detection. The utilization of carbon-based nanomaterials and metal nanoparticles has shown great potential to develop non-enzymatic nanosensors for the sensitive and selective sensing of food contaminants.Results: In this study, bifunctional carbon shell silver nanoparticles (Ag@C NPs) having oxidase-like properties and advanced optical activities were used as nanozymes for visual detection of highly toxic organophosphorus pesticide (OP), Chlorpyrifos. The asprepared nanomaterial was characterized for its structural and morphological features.The nanosensor was fabricated by immobilizing Ag@C NPs in the network of sodium alginate gel over a cellulosic paper disc. The detection was based on the inhibition of oxidase-like activity of Ag@C NPs by the adsorption of pesticide which blocks the accessibility of substrate to produce the blue-colored product. Under the optimized conditions, the fabricated sensor showed potential analytical response for Chlorpyrifos providing a dynamic linear range from 0-350 ng/mL with a limit of detection, of 0.097 ng/mL and limit of quantification, of 0.293 ng/mL. In addition, the devised sensor was able to recover Chlorpyrifos from spiked wheat, apple, and water samples with excellent recovery percentages. Further, the constructed nanosensor exhibited excellent selectivity and specificity to Chlorpyrifos. Conclusion:The fabricated surface provides a rapid, selective, low cost and portable detection method for the real-time detection of OP traces from food and environmental samples.

Amelioration in nanobiosensors for the control of plant diseases: current status and future challenges

“…The versatility of BSA-AuNCs can be applied in the environmental and food safety fields. A similar non-enzymatic nanosensor has been developed using carbon-shell silver (Ag@C) nonmaterials for the colorimetric detection of organophosphorus pesticides, including CP in agricultural products (Bilal et al, 2022). Cellulose nonenzymatic nanosensors detect CP with a detection limit of 0.097 ng/mL and quantification limit of 0.293 ng/mL.…”

Synergistic doping with Ag, CdO, and ZnO to overcome electron-hole recombination in TiO2 photocatalysis for effective water photo splitting reaction

“…These noble metals act as electron traps by forming Schottky barriers at the TiO 2 -metal junctions. This promotes efficient interfacial charge transfer and delays the recombination of electron-hole pairs, leading to improved photocatalytic performance (Harikishore et al, 2014;Endo et al, 2018;Yaqoob et al, 2020;Bilal et al, 2022). 4.…”