State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China; Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China.
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2022 Nov 15;281:121644. doi: 10.1016/j.saa.2022.121644. Epub 2022 Jul 19.
A three-dimensional (3D) surface-enhanced Raman scattering (SERS) substrate composed of gold nanoparticles (AuNPs) self-assembled covalent organic frameworks (COFs) was fabricated via the electrostatic interaction between positively charged COFs and negatively charged AuNPs, which exhibited excellent SERS performance and were successfully applied for the analyses of malachite green (MG) residue in different seafood products as well as thiram residue in several kinds of fruit juice. The raspberry-like structure SERS substrate has a larger surface area that can provide more adsorption sites in testing and improve the efficiency of sample enrichment. By using this developed SERS substrate, the detection linearity ranges are 1.0 × 10 mol·L-1.0 × 10 mol·L for MG and 5.0 × 10 mol·L-1.0 × 10 mol·L for thiram (R ≥ 0.995). The detection limits are 6.2 × 10 mol·L for MG and 1.7 × 10 mol·L for thiram, respectively. The COF-AuNPs substrate was actually applied for analysis of MG in seafood products and thiram in different fruit juice, with the recoveries in the ranges of 94.67-108.99 % for MG and 95.00-107.58 % for thiram, and both of the relative standard deviation (RSD) are no more than 5.88 %. This work indicates that the developed COF-AuNPs substrate is promising for SERS analyses and detections of residues in foods.
一种由金纳米粒子（AuNPs）自组装共价有机框架（COFs）组成的三维（3D）表面增强拉曼散射（SERS）基底，是通过带正电荷的 COFs 和带负电荷的 AuNPs 之间的静电相互作用制备的，该基底表现出优异的 SERS 性能，并成功应用于不同海鲜产品中孔雀石绿（MG）残留以及几种果汁中福美双残留的分析。覆盆子状结构的 SERS 基底具有更大的表面积，可在测试中提供更多的吸附位点，并提高样品富集的效率。使用这种开发的 SERS 基底，MG 的检测线性范围为 1.0×10 mol·L-1.0×10 mol·L，福美双的检测线性范围为 5.0×10 mol·L-1.0×10 mol·L（R≥0.995）。MG 的检测限为 6.2×10 mol·L，福美双的检测限为 1.7×10 mol·L。COF-AuNPs 基底实际用于海鲜产品中 MG 和不同果汁中福美双的分析，MG 的回收率在 94.67-108.99%之间，福美双的回收率在 95.00-107.58%之间，相对标准偏差（RSD）均不超过 5.88%。这项工作表明，开发的 COF-AuNPs 基底有望用于食品中残留的 SERS 分析和检测。
