School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
College of Electrical and Electronic Engineering, Wenzhou University, Wenzhou 325035, PR China.
Food Chem. 2023 Sep 15;420:136095. doi: 10.1016/j.foodchem.2023.136095. Epub 2023 Apr 11.
A highly structured fluorescent-SERS dual-probe nanocomposites were synthesized for the determination of sulfur-containing gases in water and beer samples. Initially, Au@Ag NPs were prepared by growing the Ag shell on the Au core in situ, modified with surfactant and fabricated with Zn. Then, MOF-5-NH assembled Au@Ag NPs were obtained through coordination between Zn sites and 2-aminoterephthalic acid. The principle was based on redox reaction between HS and Au@Ag NPs, and the fluorescence turn-on effects were due to the charge transfer between SO and amino groups. The SERS intensity was related to the concentration of HS (5 ∼ 60 nM), and an ultra-low detection limit of 2.26 nM was achieved. Importantly, the fluorescence performance was applied for SO analysis and exhibited good linear response. Moreover, the platform for HS and SO in real samples revealed satisfactory results (95.6 ∼ 101.6% and 99.0 ∼ 104.4%). Therefore, the proposed system offered a precise detection of HS/SO in food/environmental settings.
一种高度结构化的荧光拉曼双探针纳米复合材料被合成用于测定水样和啤酒样品中的含硫气体。首先，通过在 Au 核上原位生长 Ag 壳，用表面活性剂进行修饰并与 Zn 结合来制备 Au@Ag NPs。然后，通过 Zn 位点与 2-氨基对苯二甲酸之间的配位作用得到 MOF-5-NH 组装的 Au@Ag NPs。其原理基于 HS 与 Au@Ag NPs 之间的氧化还原反应，而荧光开启效应则归因于 SO 和氨基之间的电荷转移。SERS 强度与 HS 的浓度有关（5∼60 nM），并实现了超低的检测限 2.26 nM。重要的是，该荧光性能被应用于 SO 的分析，并表现出良好的线性响应。此外，该平台在实际样品中对 HS 和 SO 的分析结果令人满意（95.6∼101.6%和 99.0∼104.4%）。因此，所提出的系统为食品/环境中的 HS/SO 的精确检测提供了一种方法。
