胶态磁组装分子印迹光子晶体及其对L-苯丙氨酸的响应性

将胶态磁组装光子晶体与分子印迹技术结合, 通过磁场诱导快速、 可逆地组装得到一种灵敏度高、 选择性强且响应速度快的胶态磁组装分子印迹光子晶体(CMA-MIPCs), 并将其用于L-苯丙氨酸(L-Phe)分子的响应性研究. 结果表明, 细乳液聚合法制得的L-Phe磁性分子印迹纳米粒子(MMIPs)具有规则的球形形貌和明显的核-壳结构, 平均粒径为104.3 nm. CMA-MIPCs对L-Phe分子的识别可直接通过光学信号进行表达, 当L-Phe的浓度从6.0×10^-7 mol/L增加至6.0×10^-4 mol/L时, CMA-MIPCs的衍射色发生从紫色到深黄色的明显变化, 最大衍射峰位置红移181 nm, 响应过程仅需1 min. CMA-MIPCs对L-Phe的结构类似物L-酪氨酸(L-Tyr)和L-色氨酸(L-Trp)均无响应性, 表明CMA-MIPCs具有良好的选择性.

Colloidal Magnetically Assembled Molecularly Imprinted Photonic Crystals and L-Phenylalanine Sensing†

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. 0×10-7mol/L to 6. 0 × 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.