Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 431, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2022.114053
Keywords
Dual-channel chemosensor; Colorimetric recognition; Fluorometric detection; Glutamic acid; Sensing mechanism
Categories
Funding
- National Natural Science Foundation of China [21761018]
- Department of Education of Gansu Province ? [2021CXZX644]
- excellent Postgraduates
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This article introduces a colorimetric and fluorescent dual-channel chemosensor AMS for glutamic acid (Glu) detection, which displays rapid response and high selectivity for Glu. The chemosensor forms intermolecular hydrogen bonds with Glu and significantly quenches fluorescence, and can also detect glutamic acid through absorption spectroscopy.
A colorimetric and fluorescent dual-channel glutamic acid (Glu) chemosensor 4-methyl-6-aldehyde-6 '-methoxy2,2 '-[ethylenediyldioxybis(nitrilomethylidyne)]diphenol (AMS) bearing an aldehyde group has been designed and synthesized. This structurally simple chemosensor displays rapid response and high selectivity for Glu over other common amino acids in DMF/H2O (9: 1, v/v, buffered by 0.2 M Tris-phosphate buffer at pH = 7.0) solution. The chemosensor interacted with Glu to form intermolecular hydrogen bonds with significantly quenched fluorescence, switching from bright green fluorescence to no fluorescence. Moreover, AMS can also successfully detect glutamic acid by absorption spectroscopy, which exhibited an UV-vis spectrum change, while its color changed from pale yellow to colorless under natural light. The experimental results of the competitive amino acids revealed that chemosensor is highly selective for recognizing Glu without the interference of other amino acids. Job's plot indicates that the binding stoichiometry between the chemosensor AMS and the targeted amino acid Glu is 1:1. Hence, our experimental findings very strongly suggest that AMS can be used as chemosensor for detecting Glu in future.
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