抗坏血酸
比色法
检出限
化学
拉曼散射
核化学
双模
纳米复合材料
色谱法
拉曼光谱
分析化学(期刊)
纳米技术
材料科学
食品科学
物理
工程类
光学
航空航天工程
作者
Mengyao Qi,Baihui Wang,Huan Jiang,Yifei Li,Li Peng,Xia Zhang,Lei Han
标识
DOI:10.1016/j.jfca.2023.105740
摘要
Ascorbic acid (AA) is an essential micronutrient, which is widely used as an additive in beverages and medicines to improve food quality and human health. Herein, we developed a smartphone readable colorimetry and Surface-enhanced Raman scattering (SERS) dual-mode platform based on GeO2@Fe3O4/Au NPs nanocomposite to detect AA. GeO2@Fe3O4/Au NPs have excellent peroxidase-like activity and can oxidize colorless 3,3',5,5'-tetramethylbenzidine into blue 3,3',5,5'-tetramethylbenzidine oxide. AA can inhibit the oxidation of 3,3',5,5'-tetramethylbenzidine, which lead to fading. Based on the above principles, we developed an innovation for micro-detection of AA using oxidized 3,3',5,5'-tetramethylbenzidine as probe molecule, combined with smartphone readable colorimetry and SERS dual-mode detection. Under optimum conditions, the detection range of AA is 0.5 μmol/L -340 μmol/L and 10-9 μmol/L -100 mol/L, the detection limit is 0.6689 μmol/L and 6.162×10-13 mol/L, respectively. The method was successfully used for AA in fruits, vitamin C beverages and vitamin C tablets, and the results are consistent with the prescribed values.
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