College of Food and Biological Engineering, Jimei University, Xiamen 361021, China.
College of Food and Biological Engineering, Jimei University, Xiamen 361021, China.
Food Chem. 2019 May 30;281:57-62. doi: 10.1016/j.foodchem.2018.12.073. Epub 2018 Dec 20.
A photonic crystal (PC) sensor was prepared through molecular imprinting by using dispersed SiO microspheres as PC, sulfaguanidine (SG) as template, methacrylic acid as monomer, and ethylene glycol dimethacrylate as crosslinker. The preparation conditions were optimized as follows: molar ratio of template, monomer, and crosslinker was 1:10:4; pH was 6.0 in phosphate buffer; and volume fraction of methanol was 15%. The relationship between wavelength shift of reflection peak and SG concentration was found as: Δλ = 7.8887 lg(C) + 79.9664. The response time was only 5 min. The limit of detection was 2.8 × 10 mol L. The sensor exhibited higher specificity for SG than its sulfonamide analogs. The sensor maintained original sensing performance after five cycles of usage. The recoveries of SG ranged from 93.8% to 111.2% in lake water and from 88.5% to 115.2% in fish samples. This finding suggested that the sensor can be used in food samples with complicated matrix.
一种光子晶体（PC）传感器通过分子印迹法制备，以分散的 SiO 微球为 PC，磺胺胍（SG）为模板，甲基丙烯酸为单体，乙二醇二甲基丙烯酸酯为交联剂。优化了制备条件如下：模板、单体和交联剂的摩尔比为 1:10:4；在磷酸盐缓冲液中 pH 为 6.0；甲醇的体积分数为 15%。发现反射峰波长位移与 SG 浓度之间的关系为：Δλ=7.8887lg(C)+79.9664。响应时间仅为 5 分钟。检测限为 2.8×10mol·L。该传感器对 SG 的特异性高于其磺胺类似物。传感器在使用五次后仍保持原有的传感性能。SG 在湖水和鱼样中的回收率在 93.8%到 111.2%之间。这表明该传感器可用于复杂基质的食品样品。
