A core-shell-structured molecularly imprinted polymer on upconverting nanoparticles for selective and sensitive fluorescence sensing of XXXX .

@entity3324 @entity5494 @entity1573 @entity6842 @entity3440 @entity11542 @entity13136
UNASSIGNED: A core-shell structured molecularly imprinted polymer on upconverting nanoparticles (UCNPs@ @entity11542 ) was synthesized for the fluorescence (FL) sensing of @entity13136 ( @entity6842 ). Hexagonal UCNPs were synthesized by the solvothermal method, then coated with a thin @entity3440 shell and modified with @entity3324 groups. Finally, surface polymerization was initiated among the @entity3324 groups, the functional monomers and cross-linking agents by the initiator. The @entity11542 synthesized by this procedure was anchored on the surface of UCNPs, possessed better site accessibility and lower transfer resistance for the target molecule compared to bulk imprinted materials. The obtained UCNPs@ @entity11542 showed good binding capacity, fast response, high selectivity and specificity to the @entity6842 . The FL intensity of the UCNPs@ @entity11542 decreased sensitively with the increasing concentration of @entity6842 in the range of 50-700 ng mL(-1), the detection limit was 34 ng mL(-1) (S/N = 3). The UCNPs@ @entity11542 was successfully applied to the detection of @entity6842 in @entity1573 samples. Thanks to the unique near-infrared (NIR) excitation nature of UCNPs, the @entity1573 meat only needed some simple extraction procedures before FL detection, no complex purifications were required. The average recoveries ranged from 96.01% to 98.90%, with @entity5494 ( @entity5494 ) below 4.5%. This work offers a novel sensing system that combined the advantages of upconverting nanotechnology and molecularly imprinted technology.
