College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China.
College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China.
Anal Chim Acta. 2020 Sep 8;1129:126-135. doi: 10.1016/j.aca.2020.07.015. Epub 2020 Jul 24.
Acid orange II (AO II), a typical azo pigment, is strictly controlled by legislation and prohibited in foodstuffs. Herein, we prepared gold nanoparticles decorated amino-functionalized Cr-based metal-organic frameworks [NH-MIL-101(Cr)@Au] via an in-situ reduction method as a surface-enhanced Raman scattering (SERS) substrate for simultaneous adsorption and detection of AO II. Gold nanoparticles are uniformly dispersed on the surface of NH-MIL-101(Cr) owing to its three-dimensional (3D) structure and the interaction between -NH and Au ions, providing more SERS-active "hot spots". These NH-MIL-101(Cr)@Au nanocomposites exhibited selective and high adsorption performance (419.85 mg g) for AO II, and could be used as superior SERS substrates for the detection of AO II with a low limit of detection (LOD) of 0.05 mg L and wide detection range of 0.05-50 mg L using portable Raman spectrometer. Furthermore, this SERS assay has been successfully used to determine AO II in orange juice and chili powder with good sensitivities.
酸性橙 II（AO II）是一种典型的偶氮颜料，受到法规的严格控制，禁止在食品中使用。在此，我们通过原位还原法制备了金纳米粒子修饰的氨基功能化 Cr 基金属有机骨架[NH-MIL-101(Cr)@Au]，用作表面增强拉曼散射（SERS）基底，用于同时吸附和检测 AO II。由于其三维（3D）结构和-NH 和 Au 离子之间的相互作用，金纳米粒子均匀分散在 NH-MIL-101(Cr)表面上，提供了更多的 SERS 活性“热点”。这些 NH-MIL-101(Cr)@Au 纳米复合材料对 AO II 表现出选择性和高吸附性能（419.85 mg g），并可用作超灵敏的 SERS 基底，使用便携式拉曼光谱仪检测 AO II 的检测限（LOD）低至 0.05 mg L，检测范围为 0.05-50 mg L。此外，该 SERS 分析已成功用于测定橙汁和辣椒粉中的 AO II，具有良好的灵敏度。
