Abstract
A new bioanalytical labeling system based on alloyed quantum dots’ (QDs) photoluminescence quenching caused by an enzymatic reaction has been developed and tested for the first time. The catalytic role of the enzyme provides high sensitivity and the possibility of varying detecting time to improve assay sensitivity. Alloyed luminescent QDs were chosen in view of their small size (5–7 nm) and the high sensitivity of their optical properties to physicochemical interactions. Here, we described the synthesis of alloyed luminescent QDs and demonstrated the possibility of using them as a luminescent turn-off substrate for enzymatic assay. Synthesized alloyed QDs were found to be a sensitive turn-off substrate for glucose oxidase in homogeneous and heterogeneous assay models. CdZnSeS and CdZnSeS/ZnS QDs covered with dihydrolipoic acid and 2-mercaptoethanol were tested. A glucose oxidase limit of detection of 6.6 nM for the heterogenous high-throughput model assay was reached.
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Funding
The reported study was funded by the Russian Foundation for Basic Research (RFBR), project number 19-33-50134 mol_nr. QDs synthesis and characterization were supported by the Russian Science Foundation, grant number 20-13-00195.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Daniil D. Drozd, Nadezhda A. Byzova, Daria V. Tsyupka, and Pavel D. Strokin. Conceptualization was performed by Olga A. Goryacheva, Anatoly V. Zherdev, Irina Yu. Goryacheva, and Boris B. Dzantiev. The first draft of the manuscript was written by Daniil D. Drozd and Pavel S. Pidenko and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Published in the topical collection Analytical Methods and Applications in the Materials and Life Sciences with guest editors Ute Resch-Genger, Matthias Koch, Björn Meermann, and Michael G. Weller.
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Drozd, D.D., Byzova, N.A., Pidenko, P.S. et al. Luminescent alloyed quantum dots for turn-off enzyme-based assay. Anal Bioanal Chem 414, 4471–4480 (2022). https://doi.org/10.1007/s00216-022-04016-4
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DOI: https://doi.org/10.1007/s00216-022-04016-4