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Abstract: A colloidal magnetically assembled molecularly imprinted photonic crystals(CMA-MIPCs) with high sensitivity, strong specificity and rapid responsiveness for L-phenylalanine(L-Phe) was developed by combing a molecular imprinting technique with colloidal magnetically assembled photonic crystals. The magnetic assembly process was rapid and reversible. L-Phe magnetic molecularly imprinted nanoparticles(MMIPs) that prepared by miniemulsion polymerization were with a uniform spherical morphology and distinct core/shell structure, the average particle size of MMIPs was 104.3 nm. The CMA-MIPCs could directly transmitted the stimuli from the adsorption of different concentrations L-Phe into visual readable optical signals. The diffraction color changed from purple to orange as increasing the L-Phe concentration from 6.0 x 10-7 mol/L to 6.0 x 10-4 mol/L. The largest Bragg diffraction wavelength redshift range could reach 181 nm and the sensing time was 1 min. In addition, CMA-MIPCs showed no response to the structural analogues L-Tyr and L-Trp, which indicated that CMA-MIPCs possessed a good selectivity.
Template and target information: l-phenylalanine, l-phe, phenylalanine
Author keywords: Colloidal photonic crystals, Magnetic assembly, molecularly imprinting, l-Phenylalanine