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Preparation of AgInS2 quantum dots and their application for trypsin detection

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Abstract

Water-soluble AgInS2 quantum dots were prepared by hot injection method using glutathione (GSH) as the stabilizer. The obtained AIS QDs were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, High-resolution transmission electron microscopy, Photoluminescence spectrometer, and Dynamic light scattering. The results showed AIS QDs prepared at pH = 7.03 of reaction solution were of the strongest fluorescent and about 2.8 nm in size. AIS QDs were used directly as the fluorescent probe; a method for the determination of trypsin content was established based on the fluorescence quenching effect of trypsin on AIS QDs. Under the optimal condition, good linear relationships between the fluorescence quenching efficiency of AIS QDs and trypsin concentration were obtained in the range of 0.0625–4 μg mL−1, 10–320 μg mL−1 and 0.2–1.6 mg·mL−1, and the correlation coefficients were 0.994, 0.998 and 0.998, respectively. The detection limit was 0.4 μg mL−1. The average recovery percent of trypsin in urine was between 96.9% and 105.9%. The possible fluorescence quenching mechanism was discussed in detail and the dynamic quenching mechanism of light-induced electron transfer was proposed.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China [Grant No. 21563003], Scientific Research Fund Project of Yunnan Provincial Department of Education [grant No.2021408] Research Team of Dali University for the Synthesis and Application of Micro/Nanomaterials. The authors also thank Xiaodong Wen for providing help by the project of Dali University Innovation Team for Research and Application of Pharmaceutical Analysis Technology [Grant No. ZKLX2019216].

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  1. College of Pharmacy, Dali University, Dali, 671000, Yunnan, China

    Jingjing Wang, Manning Wang, Jie Guo, Meixian Guo & Ya Yan

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  1. Jingjing Wang
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  2. Manning Wang
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  3. Jie Guo
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Correspondence to Meixian Guo or Ya Yan.

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Wang, J., Wang, M., Guo, J. et al. Preparation of AgInS2 quantum dots and their application for trypsin detection. J Mater Sci: Mater Electron 32, 26490–26502 (2021). https://doi.org/10.1007/s10854-021-07026-7

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  • DOI: https://doi.org/10.1007/s10854-021-07026-7

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