Shi Jinyu, Wu Suyi, Xue Yu, Xie Qing, Danzeng Qunzeng, Liu Cui, Zhou Chuan-Hua
National Demonstration Center for Experimental Chemistry and Chemical Engineering Education (Yunnan University), School of Chemical Science and Technology, Yunnan University, Kunming, 650091, People's Republic of China.
Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, Innovative Drug Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing, 400044, People's Republic of China.
Mikrochim Acta. 2024 Sep 3;191(10):571. doi: 10.1007/s00604-024-06645-1.
A convenient and sensitive dual-signal visualization method is constructed for detection of trivalent chromium ions (Cr) based on fluorescent carbon dots (CDs) and glutathione-modified gold nanoparticles (GSH-Au NPs). The fluorescence of CDs can be quenched by GSH-Au NPs due to the inner filter effect. Cr induces aggregation of GSH-Au NPs because of the coordination with GSH on the surface of Au NPs, leading to the red shift of surface plasmon resonance absorption of Au NPs that provides a "turn-on" fluorescence and colorimetric assay for Cr. The fluorescence/colorimetric dual signal detection shows high sensitivity for Cr with wide detection linear ranges (0.5-70 μM for fluorescence detection and 2-50 μM for colorimetric detection) and low detection limits (0.31 μM for fluorescence detection and 0.30 μM for colorimetric detection). Besides, the method has high selectivity for Cr and can be used for detection of Cr in lake water and tap water samples, showing great potential for visual detection of environmental Cr.
基于荧光碳点（CDs）和谷胱甘肽修饰的金纳米粒子（GSH-Au NPs）构建了一种便捷灵敏的双信号可视化方法用于检测三价铬离子（Cr）。由于内滤效应，CDs的荧光可被GSH-Au NPs猝灭。Cr与金纳米粒子表面的谷胱甘肽配位，诱导GSH-Au NPs聚集，导致金纳米粒子表面等离子体共振吸收发生红移，从而为Cr提供了一种“开启”荧光和比色检测方法。荧光/比色双信号检测对Cr具有高灵敏度，检测线性范围宽（荧光检测为0.5 - 70 μM，比色检测为2 - 50 μM）且检测限低（荧光检测为0.31 μM，比色检测为0.30 μM）。此外，该方法对Cr具有高选择性，可用于湖水和自来水样品中Cr的检测，在环境Cr的可视化检测方面显示出巨大潜力。
