Abstract
In this work, a convenient and dual-signal readout optical sensing platform for the sensitively and selectively determination of beta-glucosidase (β-Glu) activity was reported using protein-inorganic hybrid nanoflowers [BSA-Cu3(PO4)2·3H2O] possessing peroxidase-mimicking activity. The nanoflowers (NFs) were facilely synthesized through a self-assembled synthesis strategy at room temperature. The as-prepared NFs could catalytically convert the colorless and non-fluorescent Amplex Red into colored and highly fluorescent resorufin in the presence of hydrogen peroxide via electron transfer process. β-Glu could hydrolyze cyanogenic glycoside, using amygdalin (Amy) as a model, into cyanide ions (CN−), which can subsequently efficiently suppress the catalytic activity of NFs, accompanied with the fluorescence decrease and the color fading. The concentration of CN− was controlled by β-Glu-triggered enzymatic reaction of Amy. Thus, a sensing system was established for fluorescent and visual determination of β-Glu activity. Under the optimum conditions, the present fluorescent and visual bimodal sensing platform exhibited good sensitivity for β-Glu activity assay with a detection limit of 0.33 U·L−1. The sensing platform was further applied to determinate β-Glu in real samples and satisfactory results were attained. Additionally, the optical sensing system can potentially be a promising candidate for β-Glu inhibitors screening.
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All data generated or analyzed during this study are included in this manuscript and the Attach File “Supporting Information” section.
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The authors gratefully acknowledge the financial support of the National Key R&D Program of China (2019YFA0607301), the China Postdoctoral Science Foundation (Nos. 2018M631850 and 2020T130088), and the Natural Science Foundation of Jilin Province, China (YDZJ202101ZYTS104).
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Ziping Liu: Conceptualization, Methodology, Investigation, Data curation, Writing-original draft. Shasha Liu: assisted with data collection and data analysis. Decai Gao: Resources, Supervision, Funding acquisition. Yanan Li: assisted with data collection and data analysis. Ye Tian: assisted with data collection and data analysis. Edith Bai: Resources, Supervision, Funding acquisition. All authors read and approved the final manuscript.
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Liu, Z., Liu, S., Gao, D. et al. An Optical Sensing Platform for Beta-Glucosidase Activity Using Protein-Inorganic Hybrid Nanoflowers. J Fluoresc 32, 669–680 (2022). https://doi.org/10.1007/s10895-021-02859-1
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DOI: https://doi.org/10.1007/s10895-021-02859-1