A ratiometric fluorescence and colorimetry dual-signal sensing strategy based on o-phenylenediamine and AuNCs for determination of Cu2+ and glyphosate

文献类型： 外文期刊

第一作者： Li, Ziqiang

作者： Li, Ziqiang;Zhang, Changsheng;Zhou, Li;Luo, Fengjian;Lou, Zhengyun;Chen, Zongmao;Zhang, Xinzhong;Yang, Mei;Li, Ziqiang;Zhang, Changsheng;Zhou, Li;Luo, Fengjian;Lou, Zhengyun;Chen, Zongmao;Zhang, Xinzhong;Yang, Mei;Liang, Shuang;Zhang, Changsheng

作者机构：

关键词： Fluorescence detection; Visual sensing; GSH-AuNCs; Cu2+; Glyphosate

期刊名称：MICROCHIMICA ACTA （ 影响因子：5.3； 五年影响因子：5.0 ）

ISSN： 0026-3672

年卷期： 2024 年 191 卷 7 期

页码：

收录情况： SCI

摘要： A ratiometric fluorescence sensing strategy has been developed for the determination of Cu2+ and glyphosate with high sensitivity and specificity based on OPD (o-phenylenediamine) and glutathione-stabilized gold nanoclusters (GSH-AuNCs). Water-soluble 1.75-nm size GSH-AuNCs with strong red fluorescence and maximum emission wavelength at 682 nm were synthesized using GSH as the template. OPD was oxidized by Cu2+, which produced the bright yellow fluorescence oxidation product 2,3-diaminophenazine (DAP) with a maximum fluorescence emission peak at 570 nm. When glyphosate existed in the system, the chelation between glyphosate and Cu2+ hindered the formation of DAP and reduced the fluorescence intensity of the system at the wavelength of 570 nm. Meanwhile, the fluorescence intensity at the wavelength of 682 nm remained basically stable. It exhibited a good linear relationship towards Cu2+ and glyphosate in water in the range 1.0-10 mu M and 0.050-3.0 mu g/mL with a detection limit of 0.547 mu M and 0.0028 mu g/mL, respectively. The method was also used for the semi-quantitative determination of Cu2+ and glyphosate in water by fluorescence color changes visually detected by the naked eyes in the range 1.0-10 mu M and 0.30-3.0 mu g/mL, respectively. The sensing strategy showed higher sensitivity, more obvious color changes, and better disturbance performance, satisfying with the detection demands of Cu2+ and glyphosate in environmental water samples. The study provides a reliable detection strategy in the environment safety fields.

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