Farooq Saqib, Chen Bochang, Gao Fukun, Muhammad Ihsan, Ahmad Shakeel, Wu Haiyan
Guangxi Key Laboratory of Agric-Environment and Agric-Products Safety, Agricultural College of Guangxi University, Nanning 530004, China.
Nanomaterials (Basel). 2022 Jun 21;12(13):2129. doi: 10.3390/nano12132129.
Modern agricultural production is greatly dependent on pesticide usage, which results in severe environmental pollution, health risks and degraded food quality and safety. Molecularly imprinted polymers are one of the most prominent approaches for the detection of pesticide residues in food and environmental samples. In this research, we prepared molecularly imprinted polymers for fenthion detection by using beta-cyclodextrin as a functional monomer and a room-temperature ionic liquid as a cosolvent. The characterization of the developed polymers was carried out. The polymers synthesized by using the room-temperature ionic liquid as the cosolvent had a good adsorption efficiency of 26.85 mg g, with a short adsorption equilibrium time of 20 min, and the results fitted well with the Langmuir isotherm model and pseudo-second-order kinetic model. The polymer showed cross-selectivity for methyl-parathion, but it had a higher selectivity as compared to acetamiprid and abamectin. A recovery of 87.44-101.25% with a limit of detection of 0.04 mg L and a relative standard deviation of below 3% was achieved from soil, lettuce and grape samples, within the linear range of 0.02-3.0 mg L, using high-performance liquid chromatography with an ultraviolet detector. Based on the results, we propose a new, convenient and practical analytical method for fenthion detection in real samples using improved imprinted polymers with room-temperature ionic liquid.
现代农业生产极大地依赖农药使用，这导致了严重的环境污染、健康风险以及食品质量和安全的下降。分子印迹聚合物是检测食品和环境样品中农药残留的最突出方法之一。在本研究中，我们以β-环糊精为功能单体、室温离子液体为助溶剂制备了用于检测倍硫磷的分子印迹聚合物。对所制备的聚合物进行了表征。以室温离子液体为助溶剂合成的聚合物具有良好的吸附效率，为26.85 mg/g，吸附平衡时间短，为20分钟，结果与朗缪尔等温线模型和伪二级动力学模型拟合良好。该聚合物对甲基对硫磷表现出交叉选择性，但与啶虫脒和阿维菌素相比具有更高的选择性。使用配备紫外检测器的高效液相色谱法，在0.02 - 3.0 mg/L的线性范围内，从土壤、生菜和葡萄样品中获得了87.44 - 101.25%的回收率，检测限为0.04 mg/L，相对标准偏差低于3%。基于这些结果，我们提出了一种使用改进的含室温离子液体的印迹聚合物检测实际样品中倍硫磷的新型、简便且实用的分析方法。
