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Abstract: Highly selective surface molecularly imprinted polymer (DHQ-MPS/SiO2) for dihydroquercetin (DHQ) was synthesized by molecular imprinting technique on modified silica particles for solid-phase extraction (SPE). The prepared DHQ-MPS/SiO2 was characterized by Fourier transform infrared spectrometer (FT-IR) and transmission electron microscope (SEM) techniques. Interactions between the functional monomer and template were observed with UV-visible spectroscopy of the solutions of these components as well. The results indicated that a 1:2 molecular complex was formed between DHQ and 2-vinylpridine. The static adsorption experiments indicated that DHQ-MPS/SiO2 had significantly higher adsorption capacity for DHQ than its non-imprinted polymers (NIP-MPS/SiO2) and revealed that the Langmuir equation fitted the adsorption isotherm data. The thermodynamics parameters indicated that the binding system for DHQ-MPS/SiO2 was endothermic and entropy was gained and was spontaneous. The selectivity coefficients of DHQ-MPS/SiO2 for DHQ in relation to competition species apigenin (API) and rutin (RUT) were 2.1 and 4.9, respectively, which suggested that DHQ-MPS/SiO2 had high recognition selectivity and binding affinity for the template DHQ. The application of DHQ-MPS/SiO2 as a selective sorbent material for extraction of DHQ from Prince's-feather Fruit sample showed that DHQ was well separated and the recovery rate was 79.6%, demonstrating the suitability of the technique for the extraction in real samples
Template and target information: dihydroquercetin, DHQ
Author keywords: Dihydroquercetin, molecularly imprinted polymer, synthesis, Solid-phase extraction