School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
Research and Innovation Center/Mechanical Engineering Department, Accra Technical University, Accra, Ghana.
Food Chem. 2020 Jun 15;315:126300. doi: 10.1016/j.foodchem.2020.126300. Epub 2020 Jan 28.
In this study, a novel sensor fabricated with compactly arranged gold nanoparticles (AuNPs) templated from mesoporous silica film (MSF) via air-water interface has been confirmed as a promising surface-enhanced Raman scattering (SERS) substrate for detecting trace levels of 2,4-dichlorophenoxyacetic acid (2,4-D), pymetrozine and thiamethoxam. The densely arranged AuNPs@MSF had an average AuNPs size of 5.15 nm with small nanogaps (<2nm) between AuNPs, and exhibited a high SERS performance. SERS spectra of pesticides were collected after their adsorption on the AuNPs@MSF. The results showed that the concentration of 2,4-D, pymetrozine and thiamethoxam gave a good linear relationship with SERS intensity. Moreover, the designed SERS-based sensor (AuNPs@MSF) was stable for 3 months with ca. 3% relative standard deviation (RSD) and was applied successfully for the analysis of 2,4-D extraction from both environmental and food samples. The proposed SERS-based sensor was further validated by HPLC and showed satisfactory result (p > 0.05).
在这项研究中，通过气-液界面制备了一种新型传感器，该传感器由介孔硅膜（MSF）模板紧密排列的金纳米粒子（AuNPs）组成，被证实是一种很有前途的表面增强拉曼散射（SERS）基底，可用于检测痕量的 2,4-二氯苯氧乙酸（2,4-D）、吡虫啉和噻虫嗪。密集排列的 AuNPs@MSF 的平均 AuNPs 尺寸为 5.15nm，AuNPs 之间的纳米间隙较小（<2nm），表现出较高的 SERS 性能。在 AuNPs@MSF 上吸附农药后，收集其 SERS 光谱。结果表明，2,4-D、吡虫啉和噻虫嗪的浓度与 SERS 强度呈良好的线性关系。此外，设计的基于 SERS 的传感器（AuNPs@MSF）在 3 个月内稳定，相对标准偏差（RSD）约为 3%，并成功应用于从环境和食品样品中提取 2,4-D 的分析。所提出的基于 SERS 的传感器还通过 HPLC 进行了验证，结果令人满意（p>0.05）。
