A dual-mode nanoprobe based on silicon nanoparticles and Fe(II)-phenanthroline for the colorimetric and fluorescence determination of nitrite

文献类型： 外文期刊

第一作者： Yang, Chunlei

作者： Yang, Chunlei;Xu, Guiju;Hou, Chenghao;Peng, Lizeng;Wang, Weiting;Zhang, Hongwei;Zhang, Xiaoling

作者机构：

关键词： Fluorescence silicon nanoparticles; Nitrite detection; Fluorometric method; Colorimetry; Nanoprobe

期刊名称：MICROCHIMICA ACTA （ 影响因子：5.7； 五年影响因子：5.4 ）

ISSN： 0026-3672

年卷期： 2023 年 190 卷 8 期

页码：

收录情况： SCI

摘要： A fluorometric and colorimetric dual-modal nanoprobe (denoted as Fe2+-Phen/SiNPs) has been developed for selective and sensitive determination of nitrite (NO2-). The mechanism is based on fluorescence quenching between silicon nanoparticles (SiNPs) and Fe(II)-phenanthroline complex (Fe2+-Phen) via inner filter effect and redox. With the addition of increasing NO2-, Fe2+ is oxidized to Fe3+, recovering the fluorescence of SiNPs. Meanwhile, the color of the system gradually changes from orange-red to colorless, which enables colorimetric measurement. The NO2- concentration shows a wide linear relationship with fluorescence intensity from 0.1 to 1.0 mM (R-2 = 0.9955) with a detection limit of 2.4 mu M in the fluorometric method (excitation wavelength: 380 nm). By contrast, the linear range of the colorimetric method ranges from 0.01 to 0.35 mM (R-2 = 0.9953) with a limit of detection of 6.8 mu M (proposed selective absorbance: 510 nm). The probe has been successfully applied to nitrite determination in water, salted vegetables, and hams demonstrating broad application prospects for the determination of nitrite in complicated matrices.

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