State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China.
State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China.
Food Chem. 2022 Nov 30;395:133623. doi: 10.1016/j.foodchem.2022.133623. Epub 2022 Jul 2.
In-situ, real-time and sensitive detection of multiple pesticide residues in food is always an important issue in food safety. Herein, a novel multifunctional bead-string like Ag nanowires@zeolitic imidazolate framework-8 (Ag NW@ZIF-8) core-shell nanochains was successfully synthesized and utilized as surface-enhanced Raman scattering (SERS) substrate for in-situ and simultaneous detection of pesticide residues. Due to the microporous framework structure of ZIF-8 shell and the plasmon property of Ag NWs core, the Ag NWs@ZIF-8 composite was demonstrated to have strong adsorption performance and high SERS activity (enhancement factor: 4.6 × 10). The Ag NWs@ZIF-8 based SERS strategy achieved sensitive detection of two water-insoluble pesticides methylparathion and carbaryl with detection limits as low as 7.6 × 10 M and 5.7 × 10 M, as well as the in-situ detection of multi-pesticide residues on fruits and vegetables with acceptable recovery ranged from 77.4 % to 117.5 %, demonstrating its great potential for in-situ and rapid detection of food contaminants.
原位、实时和灵敏检测食品中的多种农药残留一直是食品安全的重要问题。在此，成功合成了一种新型多功能串珠状 Ag 纳米线@沸石咪唑酯骨架-8（Ag NW@ZIF-8）核壳纳米链，并将其用作表面增强拉曼散射（SERS）基底，用于原位和同时检测农药残留。由于 ZIF-8 壳的微孔框架结构和 Ag NWs 核的等离子体特性，Ag NWs@ZIF-8 复合材料表现出很强的吸附性能和高 SERS 活性（增强因子：4.6×10）。基于 Ag NWs@ZIF-8 的 SERS 策略实现了对两种疏水性农药甲基对硫磷和西维因的灵敏检测，检测限低至 7.6×10 M 和 5.7×10 M，还实现了对水果和蔬菜上多种农药残留的原位检测，回收率在 77.4%至 117.5%之间，表明其在原位和快速检测食品污染物方面具有很大的潜力。
