Spectrochim Acta A Mol Biomol Spectrosc
December 2024
To address the toxicity concerns of aluminum ions (Al) due to their widespread environmental presence, a novel chromone-derived fluorescent probe, (E)-N'-((4-oxo-4H-chromen-3-yl)methylene)benzohydrazide (NMA), was developed for dual-mode detection combining colorimetric and fluorometric channels. Upon chelation with Al in a 1:1 stoichiometric ratio, NMA exhibited a significant fluorescence enhancement at 510 nm, accompanied by a rapid and visible color change due to the chelation-enhanced fluorescence (CHEF) effect, achieving an exceptional detection limit of 9 nM-well below the World Health Organization's recommended threshold. The reversible binding of NMA, demonstrated through sequential addition of Al and EDTA, enabled the construction of an INHIBIT molecular logic gate, broadening its potential for smart sensing applications.
View Article and Find Full Text PDFA new Schiff base fluorescent probe NBP derived from the one-step condensation strategy of 2-butyl-6-hydroxy-1,3-dioxo-2,3-dihydro-1-benzo[]isoquinoline-5-carbaldehyde and -(2-(hydrazinecarbonyl)phenyl)benzamide was synthesized and characterized. NBP exhibited high selectivity toward Al along with naked-eye color changes and prominent fluorescence enhancement. The limit of detection (LOD) of NBP toward Al was detected to be 80 nM.
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January 2022
Herein, a novel Schiff base fluorescent probe NIQ based on naphthalimide and iso-quinoline units has been readily prepared for the selective detection of Al ions. The obviously visible color changes and prominent fluorescence enhancement were observed upon the addition of Al to NIQ, which could be attributed to the complexation of NIQ with Al and thus leading to the inhibition of photo-induced electron transfer (PET) and the chelation-enhanced fluorescence (CHEF) progress. The limit of detection (LOD) was 52 nM that was far below the standard recommended by the WHO.
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September 2018
Being exogenous environmental pollutants, nitroanilines (NAs) are highly toxic and have mutagenic and carcinogenic activity. Being lack of studies on interactions between NAs and lysozyme at molecular level, the binding interactions of lysozyme with o-nitroaniline (oNA), m-nitroaniline (mNA) and p-nitroaniline (pNA) were investigated by means of steady-state fluorescence, synchronous fluorescence, UV-vis absorption spectroscopy, as well as molecular modeling. The experimental results revealed that the fluorescence of lysozyme is quenched by oNA and mNA through a static quenching, while the fluorescence quenching triggered by pNA is a combined dynamic and static quenching.
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February 2015
In this report, the binding interaction of chromium(VI), as Cr2O7(2-), with humic acid was studied by using UV-visible absorption, fluorescence spectroscopy, and molecular modeling method. The fluorescence spectral data indicated that the binding interaction existed between Cr2O7(2-) and humic acid and the order of magnitude of binding constants were 10(3). The rise in temperature caused a decrease in the values of the binding constant of humic acid with Cr2O7(2-).
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