CEQUINOR (UNLP, CCT-CONICET La Plata, Associated with CIC), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Boulevard 120 N° 1465, La Plata, CP 1900, Argentina.
CEQUINOR (UNLP, CCT-CONICET La Plata, Associated with CIC), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Boulevard 120 N° 1465, La Plata, CP 1900, Argentina.
Food Chem. 2022 Mar 30;373(Pt B):131570. doi: 10.1016/j.foodchem.2021.131570. Epub 2021 Nov 9.
A simple and sensitive Surface-Enhanced Raman Spectroscopy (SERS) method for the detection of thiram residues in fruit and vegetable peels is reported. A flexible SERS substrate based on silver nanoparticles in an agar gel has been developed and characterised. Peels of different fruits and vegetables were intentionally contaminated with different amounts of thiram. The analyte was then extracted within few seconds by gentle rubbing the surface with the agar substrate using it as a stamp. The optimum experimental conditions of the developed method were explored. The limit of detection of thiram in the peels of tomato and green pepper was 140 pg/cm. The values achieved for apple was 2 pg/cm. The method presented could be extensively used for the detection of traces of other contaminants on food surfaces and for other relevant applications.
报道了一种用于检测水果和蔬菜果皮中 thiram 残留的简单灵敏的表面增强拉曼光谱（SERS）方法。开发并表征了一种基于琼脂凝胶中银纳米粒子的柔性 SERS 基底。不同的水果和蔬菜果皮被故意用不同量的 thiram 污染。然后，通过使用琼脂基底轻轻擦拭表面几秒钟，将分析物作为邮票提取。探索了所开发方法的最佳实验条件。在番茄和青椒果皮中检测 thiram 的检出限为 140 pg/cm。苹果的检测限为 2 pg/cm。所提出的方法可以广泛用于检测食物表面上其他污染物的痕迹，以及其他相关应用。
