Abstract
This work established a fluorescence approach for detecting ascorbic acid (AA) based on Cu-ZnCdS quantum dots (Cu-ZnCdS QDs) and α-MnO2 nanorods. Cu-ZnCdS QDs and α-MnO2 nanorods were characterized by high-resolution transmission electron microscopy (HRTEM), fluorescence spectroscopy, inductively coupled plasma optical emission spectroscopy (ICP-OES) and X-ray diffraction (XRD). In the presence of α-MnO2 nanorods, the fluorescence of Cu-ZnCdS QDs was greatly quenched through the inner filter effect (IFE). Subsequently, AA can trigger the decomposition of the α-MnO2 nanorods which can reduce α-MnO2 to Mn2+ and recover the fluorescence. Under optimal conditions, a linear relation was obtained over the range 5.02−401.77 μM with a 31.62 μM detection limit. Through applying the fluorescent sensing system for detecting AA, a satisfactory result is obtained with recoveries ranging from 89.23% to 110.99%.
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Acknowledgments
This work was supported by a grant from the Two-Way Support Programs of Sichuan Agricultural University (project no.03570113), the Education Department of Sichuan Provincial, PR China (grant nos.13ZA0255, 16ZA0039).
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Hanbing Rao and Yao Gao contributed equally to this work.
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Rao, H., Gao, Y., Ge, H. et al. An “on-off-on” fluorescent probe for ascorbic acid based on Cu-ZnCdS quantum dots and α-MnO2 nanorods. Anal Bioanal Chem 409, 4517–4528 (2017). https://doi.org/10.1007/s00216-017-0389-4
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DOI: https://doi.org/10.1007/s00216-017-0389-4