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Scientists create a highly selective fluorescent probe, ICM-Hg, for real-time detection of mercury ions (Hg2+) in water, food samples, and live cells.
Mercury contamination poses a significant risk to human health because of its persistence in the environment and the potential for bioaccumulation through the food chain. To address this challenge, scientists from the People’s Hospital of Zhengzhou University and Luoyang Normal University have developed an innovative fluorescent probe for the selective and real-time detection of mercury ions (Hg2+). Their research, published in the Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, presents a breakthrough in mercury detection techniques (1).
The team designed and synthesized a novel fluorescent probe called (E)-O-(4-(2-(3-(dicyanomethylene)-5,5-dimethylcyclohex-1-en-1-yl)vinyl)phenyl) O-phenyl carbonothioate (ICM-Hg). This probe demonstrated remarkable selectivity and sensitivity in detecting Hg2+ in various samples, including water, food, and live cells.
ICM-Hg operates through an intramolecular charge transfer (ICT) process, which is the basis of its mercury detection mechanism. When ICM-Hg comes into contact with mercury ions (Hg2+), it triggers an ICT process within the probe molecule. This process leads to a distinct color change from colorless to bright yellow and a significant increase in yellow fluorescence emission, allowing for the selective and sensitive detection of mercury ions. With ICM-Hg the presence of Hg2+ triggers this distinct color change from colorless to bright yellow. The fluorescence emission at 585 nm exhibited a linear relationship within the concentration range of Hg2+ (0–45 μM). The detection limit for Hg2+ was calculated to be 231 nM, highlighting the probe's high sensitivity.
One of the significant advantages of ICM-Hg is its ability to detect Hg2+ in real samples, such as tap water, tea, shrimp, and crab. The probe demonstrated excellent quantitative recovery, ensuring accurate analysis of Hg2+ contamination in these commonly encountered samples.
In addition to environmental and food sample analysis, the researchers successfully applied ICM-Hg for intracellular fluorescence imaging. This capability allows for the visualization and tracking of Hg2+ within live cells, opening new avenues for studying the distribution and behavior of mercury ions in biological systems.
The development of this innovative fluorescent probe provides a rapid and reliable method for detecting and monitoring mercury contamination in water, food, and living organisms. The high selectivity, sensitivity, and real-time detection capabilities of ICM-Hg hold immense promise for environmental monitoring, food safety, and biomedical applications.
(1) Li, X.; Chu, D.; Wang, J.; Qi, Y.; Yuan, W.; Li, J. Zhou, Z.A dicyanoisophorone-based ICT fluorescent probe for the detection of Hg2+ in water/food sample analysis and live cell imaging. Spectrochimica Acta Part A: Mol. Biomol. Spectrosc. 2023, 295, 122678. DOI:10.1016/j.saa.2023.122678