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

Abstract

In this paper, a dual-functional probe, 2-(benzothiazol)-4-(3-hydroxy-4-methylphenyl) imino phenol (BHMH), was synthesized and characterized for the simultaneous detection of Cu2+ and Fe3+ in dimethyl sulfoxide/4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (DMSO/HEPES) (1:4, v/v, pH = 6.0). The limits of detections (LODs) for Cu2+ and Fe3+ were 9.05 and 48 nM, respectively. Based on the competitive coordination, the complex BHMH-Cu 2+ /Fe 3+ exhibited good sensitivity and selectivity for glyphosate. The LODs of BHMH-Cu 2+ and BHMH-Fe 3+ for glyphosate were 0.41 and 0.63 μM, respectively. The probe quantitatively detected glyphosate in tap water, Songhua River water, local water and soil, and food samples. The colorimetric on-site glyphosate sensing through the probe BHMH-Cu 2+ was also studied based on smartphones. BHMH and BHMH-Cu 2+ /Fe 3+ exhibited outstanding imaging capabilities for Cu2+, Fe3+, and glyphosate in living cells with low cytotoxicity, especially the first time for glyphosate.

A pyrene-based ratiometric probe for nanomolar level detection of glyphosate in food and environmental samples and its application for live-cell imaging

“…S5, ESI†). 22 Interestingly, signals for the protons present near bispicolyl nitrogens diminished completely during the interaction, indicating their close proximity to the Cu 2+ ion. However, when glyphosate (1 equiv.)…”

A fluorescence visual detection for glyphosine based on a biomass carbon quantum dot paper-based sensor

“…Thus, the N-CQDs released Fe 3+ and restored its fluorescence intensity. 44 The mechanism of the sensing and detection procedure are shown in Scheme 1.…”

A Multifunctional and Fast-Response Lysosome-Targetable Fluorescent Probe for Monitoring pH and Isoxaflutole

“…It was found that the LUMO energy levels of isoxaflutole and mesotrione were lower than those of other pesticides (glyphosate, oxyfluorfen, pyrazoxyfen and cypermethrin), indicating that the electron affinities of isoxaflutole with the -CF 3 electron-withdrawing group and mesotrione with the -NO 2 electron-withdrawing group were relatively higher than those of other pesticides. Meanwhile, their LUMO energy levels were between the HOMO and LUMO energy levels of MMN , which could cause the transition of electrons from the LUMO orbital of MMN to the LUMO orbitals of isoxaflutole and mesotrione in the excited state [ 32 , 33 , 34 , 35 , 36 , 37 ]. The transition of electrons from the LUMO orbital of MMN in the excited state to the LUMO of isoxaflutole prevented the electrons from returning to the HOMO orbital of MMN , leading to the phenomenon of fluorescence quenching in the recognition of isoxaflutole.…”