A CTAB-Mediated Ratiometric Design for Sensitive Detection of Organophosphate Pesticides
Paper ID : 1159-ICNS
Authors:
Nafiseh Fahimikashani *1, Mohammad Reza Hormozi Nezhad2
1Department of Chemistry, Sharif University of Technology, Tehran, Iran
2Department of Chemistry, Sharif University of Technology, Tehran 11155-9516, Iran‎
Abstract:
The widespread use of pesticides in pest management has boosted the demands for developing highly sensitive probes for on-site monitoring. However, accumulation of pesticide residues in food chain together with the high toxicity of OPs through irreversible phosphorylation and inactivation of acetylcholinesterase (AChE) in the central and peripheral nervous system, are causes for acute human health and environmental concerns Herein we proposed a sensitive enzyme-free ratiometric probe for determination of methyl parathion (MP) in rice and tap water samples using TGA-capped CdTe QDs and carbon dots (CDs). Self-assembly of Cetyltrimethylammonium bromide (CTAB) on the surface of CdTe QDs facilitates the quenching of CTAB-QDs in the presence of MP while the fluorescence intensity of CDs remains constant. The ratiometric probe demonstrates continuous emission color changes from orange-peach into pink, purple, weak blue, and dark blue. Under optimum conditions, a broad linear range from 0.001 µg.mL-1 to 9 µg.mL-1 MP with a detection limit as low as 1.0 ng.mL-1 (S/N=3) were obtained. Furthermore, this platform has the capability to identify MP in rice and tap water with satisfactory results.
Keywords:
“Ratiometric Probe”, “CTAB-Mediated Approach”, “Organophosphate Pesticides”
Status : Abstract Accepted (Oral Presentation)