Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi 110012, India.
Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi 110012, India.
Food Chem. 2018 Jul 30;255:81-88. doi: 10.1016/j.foodchem.2018.02.061. Epub 2018 Feb 12.
A magnetic molecularly imprinted polymer (MMIP) adsorbent for imidacloprid was prepared using non-covalent approach with functionalized nano FeO particles (magnetic cores), imidacloprid (template), acrylic acid (functional monomer), ethylene glycol dimethacrylate (cross linker) and azobisisobutyronitrile (initiator) and used for selective separation of imidacloprid from honey and vegetable samples. The polymers were characterized using FT-IR spectroscopy, SEM and TEM images. For analysis of imidacloprid LC-MS/MS equipment was used. Adsorption kinetics was best explained by pseudo-second-order kinetic model. Adsorption data fitted well into linearized Freundlich equation (R > 0.98). Scatchard plot analysis indicates the presence of two classes of binding sites in the MMIPs with the C of 1889.6 µg g and 65448.9 µg g, respectively. MMIPs demonstrated much higher affinity for imidacloprid over structurally similar analogues acetamiprid (α = 23.59) and thiamethoxam (α = 17.15). About 87.1 ± 5.0% and 90.6 ± 5.6% of the added imidacloprid was recovered from MMIPs in case of fortified eggplant and honey samples, respectively.
采用非共价方法，以功能化纳米 FeO 颗粒（磁性核）、吡虫啉（模板）、丙烯酸（功能单体）、乙二醇二甲基丙烯酸酯（交联剂）和偶氮二异丁腈（引发剂）为原料，制备了用于从蜂蜜和蔬菜样品中选择性分离吡虫啉的磁性分子印迹聚合物（MMIP）吸附剂。采用傅里叶变换红外光谱、SEM 和 TEM 图像对聚合物进行了表征。为了分析吡虫啉，使用了 LC-MS/MS 设备。吸附动力学最好用伪二阶动力学模型解释。吸附数据很好地拟合了线性化的 Freundlich 方程（R > 0.98）。Scatchard 图分析表明，MMIPs 中存在两类结合位点，其 C 值分别为 1889.6 µg/g 和 65448.9 µg/g。与结构相似的类似物乙酰甲胺磷（α=23.59）和噻虫嗪（α=17.15）相比，MMIPs 对吡虫啉表现出更高的亲和力。在加标茄子和蜂蜜样品中，分别有 87.1%±5.0%和 90.6%±5.6%的添加吡虫啉从 MMIPs 中回收。
