Luminescent molecularly imprinted polymer nanocomposites for emission intensity and lifetime rapid sensing of tenuazonic acid mycotoxin

Interaction of a 1,3-Dicarbonyl Toxin with Ru(II)-Biimidazole Complexes for Luminescence Sensing: A Spectroscopic and Photochemical Experimental Study Rationalized by Time-Dependent Density Functional Theory Calculations

“…The functional groups of these ancillary ligands (2,2′-bipyridine-4,4′-dicarboxylic acid, dcb; 2,2′-bipyridine-4,4′-disulfonate, s2b; and 2,2′-bipyridin-4,4′-diyldimethyl diacrylate, dab) have been chosen to eventually be able to tether the luminescent complexes to a polymeric matrix for chemical sensing applications (via carboxamide, sulfonamide, or radical polymerization). 15 For the sake of comparison, the 1,10-phenanthroline (phen) complex was also prepared. The luminescent dyes were synthesized in a two-step route.…”

“…This phenomenon has already been observed for the luminescence of [Ru(dab) 2 (bim)] 2+ in acetonitrile–water medium. 15 Therefore, an irreversible proton transfer or a slow proton exchange and not an acid–base equilibrium is taking place in their 3 MLCT excited state (otherwise, a single exponential would be observed). An irreversible deprotonation in the excited state has indeed been observed for a 2-pyridylimidazole Ru(II) complex in water.…”

“… 5 [Ru(phen) 2 (bim)] 2+ (phen stands for 1,10-phenanthroline) and [Ru(dab) 2 (bim)] 2+ were synthesized by the following literature methods, and their NMR data were found to be coincident with those reported. 15 , 23 2,2′-Bipyridine-4,4′-dicarboxylic acid (dcb) and tetrabutylammonium (TBA) acetate were purchased from Alfa Aesar (Germany). Ruthenium(III) chloride trihydrate, lithium chloride, and 2,2,6-trimethyl-4H-1,3-dioxin-4-one were from Acros Organics.…”

“…Considering its chemical structure, we have recently proposed the 2,2′-biimidazole (bim) ligand as a suitable receptor for TeA. 15 A double coordination feature allows bim to chelate a metal atom while keeping its ability to establish two simultaneous hydrogen bonds with different oxoanions of appropriate geometry ( Scheme 1 ). Incorporation of bim to the coordination sphere of the metal complex considerably increases the acidity of the imidazole NH groups (p K a of free H 2 bim, 11.5; p K a1 of [Ru(bpy) 2 (bim)] 2+ , 7.2).…”

Recombinant Antibody-Based and Computer-Aided Comprehensive Analysis of Antibody’s Equivalent Recognition Mechanism of Alternariol and Alternariol Monomethyl Ether

“…In the last decade, liquid chromatography–tandem mass spectrometry (LC-MS/MS) ( Krausová et al, 2021 ), immunoassay ( Ackermann et al, 2011 ; Burkin and Kononenko, 2011 ; Kong et al, 2017 ; Man et al, 2017 ; Singh et al, 2018 ; Wang et al, 2018 ; Cai et al, 2021 ; Liang et al, 2021 ) and other methods with molecularly imprinted polymer or aptamers as core reagents were used to detect Alternaria mycotoxins in food and biology samples ( Quílez-Alburquerque et al, 2021 ; Wang et al, 2022 ). Given the advantages of simple operation, less time consumption, and low cost, immunological methods were considered to be the most suitable method for the on-site detection of Alternaria mycotoxins in food samples ( Ackermann et al, 2011 ), and an antibody was supposed to be the most important reagent.…”