Cobalt oxyhydroxide nanoflakes enable ratiometric fluorescent assay of gallic acid

文献类型： 外文期刊

第一作者： Yang, Chunlei

作者： Yang, Chunlei;Xu, Guiju;Hou, Chenghao;Zhang, Hongwei

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关键词： CoOOH nanoflakes; Ratiometric fluorescence; Gallic acid detection; Fluorescent silicon nanoparticles

期刊名称：FOOD CHEMISTRY-X （ 影响因子：8.2； 五年影响因子：8.2 ）

ISSN： 2590-1575

年卷期： 2024 年 24 卷

页码：

收录情况： SCI

摘要： Gallic acid (GA) is widely used in beverages, food, and other fields as antioxidant. However, GA is slightly toxic and the accumulation of GA is harmful to human body. Therefore, it's vital to develop simple and sensitive detection methods for GA. In this work, a novel ratiometric fluorescent nanoprobe (named CoOOH/OPD/SiNPs) for the GA detection in different foods was designed and prepared. The fluorescence of silicon nanoparticles (SiNPs) at 443 nm would be quenched by cobalt oxyhydroxide (CoOOH) nanoflakes. o-phenylenediamine (OPD) would be oxidized to 2,3-diaminophenazine (DAP) by CoOOH nanoflakes that have peroxidase-like activity, which produces a new fluorescent peak at 556 nm. Meanwhile, SiNPs' fluorescence would be quenched through DAP due to inner filter effect (IFE). With the addition of GA, the reductive decomposition of CoOOH decreased DAP level, causing IFE being restrained. The concentration of GA indicates an excellent linear relationship with fluorescence ratio (F (443) /F (556) ) in range of 0.4-12 mu M (R-2 = 0.9937) with 0.16 mu M detection limit. This nanoprobe is applied to GA detection in water, tea leaves, fruits and nut fruits, which would be expected to act as a portable device for complex substances analysis.

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