Colorimetric Sensing of Chlorpyrifos Pesticides Using Green Synthesized Silver Nanoparticles from Neem Root Extracts

Colorimetric Sensing of Chlorpyrifos Pesticides Using Green Synthesized Silver Nanoparticles from Neem Root Extracts

This study explores the colorimetric sensing of chlorpyrifos (CP) pesticides using neem root extracts-synthesized silver nanoparticles (NRE-AgNPs). The NRE-AgNPs were synthesized via a cost-effective bio-reduction method from neem (Azadirachta indica) and evaluated for their pesticide’s  colorimetri...

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Bibliographic Details
Main Authors: Abidemi Mercy Babatimehin, Oyebola Elizabeth Ogunbamowo, Gabriel Olukayode Ajayi, Ali El Gamal, Talha Bin Emran, Edwin Andrew Ofudje, Mohamed Hefnawy
Format: Article
Language:English
Published: North Carolina State University 2025-06-01
Series:BioResources
Subjects:
azadirachta indica
colorimetric sensing
nanoparticles
pesticides
phytochemicals
Online Access:https://ojs.bioresources.com/index.php/BRJ/article/view/24621
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Summary:This study explores the colorimetric sensing of chlorpyrifos (CP) pesticides using neem root extracts-synthesized silver nanoparticles (NRE-AgNPs). The NRE-AgNPs were synthesized via a cost-effective bio-reduction method from neem (Azadirachta indica) and evaluated for their pesticide’s  colorimetric sensing property. Phytochemical analysis confirmed the presence of tannins (80.4 mg/mL), phenols (60.8 mg/mL), flavonoids (54.6 mg/mL), alkaloids (28.9 mg/mL), reducing sugars (59.1 mg/mL), and cardiac glycosides (47.6 mg/mL), which facilitated nanoparticle formation and stability. Scanning electron microscopy revealed nanoparticles with an average particle size of 68.3 nm, while energy-dispersive X-ray spectrum confirmed the presence of silver (0.14% atomic, 0.25% weight) alongside stabilizing organic compounds. UV-Vis spectroscopy confirmed NRE-AgNP synthesis with a surface plasmon resonance peak at 405 nm. The nanoparticles responded sensitively to the presence of the chlorpyrifos, especially at 300 to 350 nm, marking a clear deviation from their original 405 nm signature, thus confirming the viability of AgNPs as an optical sensor. This study underscores the potential of neem root-based AgNPs as a sustainable and eco-friendly solution for pesticide sensing, offering promising applications in the environmental field.
ISSN:1930-2126

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