Selective detection of glufosinate using CuInS₂ quantum dots as a fluorescence probe

Abstract

We designed a novel method for rapid detection of glufosinate, based on quantum dots (QDs) as a fluorescence probe. To date, no studies have been published on the detection of glufosinate usingQDs. The innovation of this fluorescence system, which was constructed using CuInS 2 QDs and Cu(IDA)$ 2H 2 O, is based on the use of intermolecular hydrogen bonds between Cu(IDA)$2H 2 O and carboxyl group (-COOH) to detect glufosinate. In the fluorescence "turn-on" step, the presence of glufosinate induces the release of Cu(IDA)$2H 2 O from the surface of the QDs, resulting in fluorescence intensity recovery. This method was performed in relatively clean aqueous solutions. Under optimal conditions, the calibration curve of the method showed good linearity for glufosinate, with a correlation coefficient (R 2 ) of 0.99597. The method was employed to detect glufosinate on fresh tea-leaves, with satisfactory results.

New Fluorescent Probes for the Sensitive Determination of Glyphosate in Food and Environmental Samples

“…When glyphosate was present in the BHMH-Cu 2+ /Fe 3+ system, the functional groups of glyphosate, such as carboxylate, amine, and phosphonate, chelated with Cu 2+ /Fe 3+ to form a more stable complex, so that BHMH was released and the fluorescence intensity of the system recovered. Although the structures of glufosinate and glyphosate are similar, the amino and phosphonate groups are separated by three methylenes in glufosinate, which makes its spatial chelation with Cu 2+ /Fe 3+ weaker than that of glyphosate . However, other pesticides without successive coordination groups in space failed to form a stable coordination with Cu 2+ /Fe 3+ and could not form a chelation effect with Cu 2+ /Fe 3+ .…”

“…Although the structures of glufosinate and glyphosate are similar, the amino and phosphonate groups are separated by three methylenes in glufosinate, which makes its spatial chelation with Cu 2+ /Fe 3+ weaker than that of glyphosate. 46 However, other pesticides without successive coordination groups in space failed to form a stable coordination with Cu 2+ /Fe 3+ and could not form a chelation effect with Cu 2+ /Fe 3+ . Therefore, it was feasible to regard the balance of competitive coordination balance between BHMH-Cu 2+ /Fe 3+ and glyphosate as a new method to determine the glyphosate residue.…”

A highly selective and sensitive CdS fluorescent quantum dot for the simultaneous detection of multiple pesticides

“…Glufosinateammonium, which is the best substitute for paraquat, has low toxicity but glufosinate-ammonium poisoning incidents also often occur, causing certain harm to the human respiratory system, digestive system, and nervous system. 10,11 Furthermore, the use of these pesticides has introduced a large number of residues into the soil and drinking water, which will enter the food chain and the human body due to their aquatic use pattern and high environmental stability. Therefore, to monitor these pesticides in agriculture products, soil, and drinking water, the development of simple, rapid, and efficient detection methods is of urgent importance.…”

Multiporous Terbium Phosphonate Coordination Polymer Microspheres as Fluorescent Probes for Trace Anthrax Biomarker Detection

“…To develop a competitive and actually available fluorescence spectroscopy-based detection method, the crucial impact factor is the fluorescent probe. Nowadays, several kinds of fluorescent probes such as quantum dots, − traditional organic dyes, , transition metal complexes, and lanthanide-based coordination polymers − have been designed and prepared. However, the traditional organic dyes are sometimes difficult to dissolve in water and are easily bleached by light. , Several fluorescent probes are easily affected by background noise, which seriously influence the detection results .…”