In modern agriculture, the application of chlorinated pesticides plays a critical role in managing pests affecting crops, herbs, and spices. However, the extensive use of these organochlorines rises concerns regarding potential residues in food products and their impact on human health1. In response, regulatory bodies have established maximum residue levels to ensure adherence to safety standards. Conventional detection methods, like high-performance liquid chromatography, though effective, involve labour-intensive and costly processes. Considering this, is worth exploring alternative techniques for faster, on-field detection. A potentially successful approach is fluorescence-based detection, involving intrinsic fluorophores. Zinc oxide is suitable for these methods, as it is safe and biocompatible. A surface functionalization of the ZnO nanoparticles (NPs) ensures the interaction between the former and the pesticides, resulting in a quenching or enhancing of the fluorescence signal intensity, thus providing the detection3,4. In a previous related paper (3-aminopropyl) trimethoxysilane (APTMS) was used as the coating agent and its interaction with the organochlorine penconazol was studied2. In this current study, the potential of various amino-silanes is explored. Also, a double functionalization is performed, using tetraorthosilicate (TEOS) to increase the dispersibility of the NPs in aqueous solutions; and then the amino-silane as the outermost layer providing the -NH2 tail that serves as a hook for the -Cl of organochlorines.

Pesticides detection through ZnO-based fluorescent nanoprobes

Bauer, Elvira Maria;
2024

Abstract

In modern agriculture, the application of chlorinated pesticides plays a critical role in managing pests affecting crops, herbs, and spices. However, the extensive use of these organochlorines rises concerns regarding potential residues in food products and their impact on human health1. In response, regulatory bodies have established maximum residue levels to ensure adherence to safety standards. Conventional detection methods, like high-performance liquid chromatography, though effective, involve labour-intensive and costly processes. Considering this, is worth exploring alternative techniques for faster, on-field detection. A potentially successful approach is fluorescence-based detection, involving intrinsic fluorophores. Zinc oxide is suitable for these methods, as it is safe and biocompatible. A surface functionalization of the ZnO nanoparticles (NPs) ensures the interaction between the former and the pesticides, resulting in a quenching or enhancing of the fluorescence signal intensity, thus providing the detection3,4. In a previous related paper (3-aminopropyl) trimethoxysilane (APTMS) was used as the coating agent and its interaction with the organochlorine penconazol was studied2. In this current study, the potential of various amino-silanes is explored. Also, a double functionalization is performed, using tetraorthosilicate (TEOS) to increase the dispersibility of the NPs in aqueous solutions; and then the amino-silane as the outermost layer providing the -NH2 tail that serves as a hook for the -Cl of organochlorines.
2024
Istituto di Struttura della Materia - ISM - Sede Secondaria Montelibretti
penconazole
fluorescence
nanosensor
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/520452
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