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N-Do** CQDs as an Efficient Fluorescence Probe Based on Dynamic Quenching for Determination of Copper Ions and Alcohol Sensing in Baijiu

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Abstract

To address an accurate detection of heavy metal ions in Baijiu production, a nitrogen-do** carbon quantum dots (N-CQDs) was prepared by hydrothermal method from citric acid and urea. The as-prepared N-CQDs had an average particle size of 2.74 nm, and a large number of functional groups (amino, carbonyl group, etc.) attached on its surface, which obtained a 9.6% of quantum yield (QY) with relatively high and stable fluorescence performance. As a fluorescent sensor, the fluorescence of N-CQDs at 380 nm excitation wavelength could be quenched quantitatively by adding Cu2+, due to the dynamic quenching of electron transfer caused by the binding of amine groups and Cu2+, which showed excellent sensitivity and selectivity to Cu2+ in the range of 0.5–5 μM with a detection limit (LOD) of 0.032 μM. In addition, the N-CQDs as well as could be applied to quantitative determine alcohol content in the range of 10–80 V/V% depending on the fluorescence enhancement. Upon the experiment, the fluorescent mechanism was studied by Molecular dynamics (MD) simulations, which demonstrated that solvent effect played an influential role on sensing alcohol content in Baijiu. Overall, the work provided a theoretically guide for the design of fluorescence sensors to monitor heavy metal ion in liquid drinks and sense alcohol content.

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All data were provided in the manuscript.

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Authors and Affiliations

  1. School of Light Industry, Bei**g Technology and Business University, Bei**g, 100048, China

    Ying Liu, Mengjie Zhao, Xuqi Liu, Shang Feng, Qiufeng Zhu & Shuangyang Li

  2. Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Bei**g, 100048, China

    Qiufeng Zhu & Shuangyang Li

  3. China Food Flavor and Nutrition Health Innovation Center, Bei**g, 100048, China

    Qiufeng Zhu & Shuangyang Li

  4. State Key Laboratory of Organic-Inorganic Composites, Bei**g University of Chemical Technology, Bei**g, 100029, China

    **anren Zhang

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  1. Ying Liu
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Contributions

Ying Liu and Qiufeng Zhu wrote the main manuscript text and Mengjie Zhao and Shang Feng prepared figures 1-13 and table 1-2. Xuqi Liu， Shuangyang Li and **anren Zhang performed Molecular simulations. All authors reviewed the manuscript.

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Correspondence to Qiufeng Zhu.

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Liu, Y., Zhao, M., Liu, X. et al. N-Do** CQDs as an Efficient Fluorescence Probe Based on Dynamic Quenching for Determination of Copper Ions and Alcohol Sensing in Baijiu. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03749-y

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