Molecularly Imprinted Dual-Responsive Extraction for Avenanthramides Using Covalent Organic Frameworks Doped with Polyethyleneimine-Modified Mn-ZnS Quantum Dots

Functional Hybrid Micro/Nanoentities Promote Agro-Food Safety Inspection

“…QDs have adjustable emission, broad excitation spectra, strong fluorescence, high optical stability, and long fluorescence lifetimes; therefore, they are especially suitable for fluorescent probes . Mn–ZnS QDs hold a longer luminescent lifetime because the doped ions acting as a recombination center can be used as electron–hole pairs, resulting in characteristic and strong luminescence. , …”

“…Meanwhile, the spiked recoveries ranged from 94.39 to 115.15%, with the relative standard deviation range of 1.27–3.19% ( n = 3). In this work, the nanoentity could be used to extract and detect avenanthramides (AVNs) in oat samples …”

“…119 Mn−ZnS QDs hold a longer luminescent lifetime because the doped ions acting as a recombination center can be used as electron−hole pairs, resulting in characteristic and strong luminescence. 120,121 Yuan et al prepared a dual-responsive MIP by a one-pot polymerization from COFs containing Mn-doped ZnS QDs modified with polyethylenimine. Thereinto, modified Mn− ZnS QDs are polymerized with COFs through the Schiff base reaction and then self-assembled with functional monomers and cross-linkers to form MIPs.…”

“…In this work, the nanoentity could be used to extract and detect avenanthramides (AVNs) in oat samples. 120 ■ COFS@FE 3 O 4 FOR MAGNETIC RAPID SEPARATION AND EFFICIENT SAMPLE PREPARATION Recently, MSPE 122 based on the use of magnetic or magnetizable sorbents has been used and promoted in the 21st century and has been widely used as a new sample pretreatment technique for the enrichment and determination of trace organic contaminants. 123,124 In the MSPE procedure, magnetic sorbents are placed directly in the sample solution to enrich the target analytes, which can then be quickly separated from the sample solution by an external magnetic field without additional filtration or centrifugation, and finally the target analytes are resolved with a resolving solution and used for instrumental analysis.…”