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 using QDs. The innovation of this fluorescence system, which was constructed using CuInS₂ QDs and Cu(IDA)·2H₂O, is based on the use of intermolecular hydrogen bonds between Cu(IDA)·2H₂O and carboxyl group (–COOH) to detect glufosinate. In the fluorescence “turn-on” step, the presence of glufosinate induces the release of Cu(IDA)·2H₂O 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 (R²) of 0.99597. The method was employed to detect glufosinate on fresh tea-leaves, with satisfactory results.