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Enzyme-mediated Ru@UiO-66@MnO2 NSs/thiamine-based ratiometric fluorescence sensor for visual detection of organophosphorus pesticide residues.
- Source :
-
Food Chemistry . Dec2023, Vol. 429, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- [Display omitted] • An enzyme-mediated ratiometric fluorescent probe was developed. • Ru@UiO-66 acted as a reference signal and thiamine acted as a response signal. • It integrated quenching effect, enzyme-like activity and enzyme inhibition. • It exhibited excellent analytical performance against dichlorvos and chlorpyrifos. • Ratiometric fluorescent hydrogels were developed for portable visual detection. In view of the potential hazards of organophosphorus pesticides (OPs), this paper constructed a ratiometric fluorescent probe utilizing a functionalized metal–organic framework to detect OPs. Ru(bpy) 3 Cl 2 was encapsulated inside UiO-66 as a reference signal, and MnO 2 nanosheets (MnO 2 NSs) were grown on the surface to obtain Ru@UiO-66@MnO 2 NSs. Acetylcholinesterase catalyzed the decomposition of acetylcholine into reductive thiocholine, which consumed MnO 2 NSs, thus restoring the Ru@UiO-66 fluorescence. Due to the enzymatic inhibition of OPs and the redox reaction between MnO 2 NSs and thiamine, this probe emitted blue fluorescence in the presence of OPs. The probe achieved linear responses to dichlorvos and chlorpyrifos with LODs of 9.99 × 10-6 μg mL−1 and 9.99 × 10-5 μg mL−1. The probe exhibited a satisfactory recovery rate for OPs in green tea. Furthermore, a hydrogel detection platform was developed by embedding the probe into sodium alginate. Overall, this work provides a visual approach to detect OPs in agricultural products. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03088146
- Volume :
- 429
- Database :
- Academic Search Index
- Journal :
- Food Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 170012531
- Full Text :
- https://doi.org/10.1016/j.foodchem.2023.136945