Lv Mingchun, Pu Hongbin, Sun Da-Wen
School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China; Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
Food Chem. 2024 Feb 1;433:137389. doi: 10.1016/j.foodchem.2023.137389. Epub 2023 Sep 3.
A new type of durian-shaped FeO@Au@Ag@Au (DFAAA) multilayer core-shell composite was prepared as an efficient surface-enhanced Raman scattering (SERS) substrate. The optimization process and SERS enhancement mechanism of the substrate were further explained with finite-difference time-domain simulation. The dense and uniform spiny array on the DFAAA surface had abundant "hot spots", greatly improving sensitivity, uniformity and reproducibility, with a Raman enhancement factor of 3.01 × 10 and storage-life of 30 d. A "flow magnetic detection method" was proposed to realize rapid and flexible detection of pesticide residues on the surface of different foods including fish and apple. The limit of detection of malachite green and thiram on the fish and apple surfaces were 0.13 and 0.18 ng/cm, respectively. With its high SERS performance and good magnetic, the DFAAA possessed great application prospects as a facile SERS substrate for rapid and non-destructive detection of trace pesticide residues on foods.
制备了一种新型榴莲状的FeO@Au@Ag@Au（DFAAA）多层核壳复合材料作为高效的表面增强拉曼散射（SERS）基底。利用时域有限差分模拟进一步解释了该基底的优化过程和SERS增强机制。DFAAA表面致密且均匀的刺状阵列具有丰富的“热点”，极大地提高了灵敏度、均匀性和重现性，拉曼增强因子为3.01×10，储存寿命为30天。提出了一种“流动磁检测方法”，以实现对包括鱼和苹果在内的不同食品表面农药残留的快速灵活检测。鱼和苹果表面孔雀石绿和福美双的检测限分别为0.13和0.18 ng/cm。DFAAA具有高SERS性能和良好的磁性，作为一种简便的SERS基底用于食品中痕量农药残留的快速无损检测具有广阔的应用前景。
