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Reference type: Journal
Authors: Fernandes RS, Dinc M, Raimundo IMJ, Mizaikoff B
Article Title: Molecularly imprinted core-shell hybrid microspheres for the selective extraction of vanillin.
Publication date: 2017
Journal: Analytical Methods
Volume: 9
Issue: (19)
Page numbers: 2883-2889.
DOI: 10.1039/C7AY00461C

Abstract: Molecularly imprinted polymers (MIPs) with a core-shell structure for efficient, reliable, and selective extraction of vanillin via solid-phase extraction (SPE) and incubation methods were developed using a sol-gel process based on (3-aminopropyl)triethoxysilane (APTES) as the functional monomer, tetraethoxysilane (TEOS) as the cross-linker, and vanillin as the template. An inorganic core composed of porous (SM1) and non-porous (SM2) silica microspheres was prepared by co-condensation of TEOS and (3-aminopropyl)trimethoxysilane (APTMS) in a water-in-oil (W/O) macroemulsion. The thus synthesized materials were characterized in detail, and their molecular recognition properties and selectivity were demonstrated by evaluating their adsorption capacity and binding kinetics at imprinted (MIP) and non-imprinted (NIP) control materials. The proposed binding mechanism takes advantage of the amino groups associated with APTES interacting with the functional groups of the template molecules to form hydrogen-bonded complexes. Furthermore, synthesis conditions were optimized such that the imprinting efficiency and adsorption capacity were maximized. Finally, it was demonstrated via incubation experiments that the thus generated MIP core-shell hybrid microspheres provide rapid adsorption with high binding capacities (up to 5.64 mg g-1), excellent imprinting factors (IF up to 2.37), and exceptional reusability (reused >20 times)
Template and target information: vanillin


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