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首页> 外文期刊>Sensors and Actuators >Self-assembled dual-emissive nanoprobe with metal-organic frameworks as scaffolds for enhanced ascorbic acid and ascorbate oxidase sensing
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Self-assembled dual-emissive nanoprobe with metal-organic frameworks as scaffolds for enhanced ascorbic acid and ascorbate oxidase sensing

机译：具有金属有机框架的自组装双发射纳米孔作为用于增强的抗坏血酸和抗坏血酸氧化酶感测的支架

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摘要

Herein, a ratiometric fluorescent nanoprobe was successfully fabricated through incapsulating quantum dots (QDs) and carbon dots (CDs) into the cavities of zeolitic imidazolate framework-8 by self-assembly, which generated QDs/CDs@MOFs. The QDs/CDs@MOFs nanoprobe combined the properties of metal - organic frameworks (MOFs) and ratiometric fluorescent nanoprobe, thus it possessed following advantages including strong adsorption and enrichment ability for the analytes, and the ability of eliminating interferences of environmental and instrumental factors. The fluorescence of QDs loaded in the cages of ZIF-8 was initially quenched by mercury ions. However, mercury ions could be reduced to mercury atom by ascorbic acid (AA), leading to the restoration of QDs fluorescence. Moreover, under the catalysis of ascorbate oxidase (AAO), AA was oxidized to dehydroascorbic acid that couldn't reduce mercury ions, resulting in the fluorescence of QDs quenched again. Simultaneously, the fluorescence of CDs loaded in the ZIF-8 was not affected under above procedures. Hence, with QDs serving as reporter signal and CDs acting as stable reference signal, a ratio fluorescence platform was constructed for sensitive determination of AA and AAO with the linear calibration in the range of 0.01-0.2 μM and 0.05-4 U·L~(-1) and the detection limit of 4 nM and 0.02 U·L~(-1), respectively.
机译：在此，通过自动组装将量子点（QDS）和碳点（CDS）将量子点（QDS）和碳点（CDS）成功地制造了比例荧光纳米孔，其产生QDS / CDS / CDS / MOF的沸石咪唑酯骨架-8的空腔。 QDS / Cds @ Mofs Nanoprobe组合了金属 - 有机框架（MOF）和比率荧光纳米骨素的性质，因此具有以下优点，包括对分析物的强烈吸附和富集能力，以及消除环境和乐器因素的干扰的能力。 ZIF-8的笼子中QD的荧光最初被汞离子猝灭。然而，通过抗坏血酸（AA）可以将汞离子降低到汞原子，导致QD荧光的恢复。此外，在抗坏血酸氧化酶（AAO）的催化下，AA被氧化成脱羟唇脂酸，不能减少汞离子，导致QD的荧光再次猝灭。同时，在ZIF-8中加载的CD的荧光在上述方法下不受影响。因此，用QDS用作记者信号和作用作为稳定参考信号的CD，构造了比率荧光平台，用于敏感测定AA和AAO，线性校准范围为0.01-0.2μm和0.05-4 u·l〜（ -1）和4nm的检出限和0.02 u·l〜（-1）。

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  • 来源
    《Sensors and Actuators》 |2021年第7期|129910.1-129910.9|共9页
  • 作者

    Junyang Chen; Shan Jiang; Mengke Wang; Xiaolei Xie; Xingguang Su;

  • 作者单位

    Department of Analytical Chemistry College of Chemistry Jilin University Changchun 130012 PR China;

    State Key Laboratory of Supramolecular Structure and Materials Jilin University Changchun 130012 PR China;

    Department of Analytical Chemistry College of Chemistry Jilin University Changchun 130012 PR China;

    Department of Analytical Chemistry College of Chemistry Jilin University Changchun 130012 PR China;

    Department of Analytical Chemistry College of Chemistry Jilin University Changchun 130012 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    QDs/CDs@MOFs nanoprobe; Mercury ions; Ascorbic acid; Ascorbate oxidase; Ratiometric;

    机译：QDS / CDS @ MOFS Nanopobe;水银离子;抗坏血酸;抗坏血酸氧化酶;比例;

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