Peroxidase-like activity of MoS quantum dots (QDs) can be reversibly regulated by means of Fe/alendronate sodium (ALDS)-induced aggregation/disaggregation of the QDs in solution. Specifically, Fe can selectively aggregate the MoS QDs and thus greatly enhance their peroxidase-like activity, while such enhancement can be inhibited in the presence of ALDS owing to the competitive coordination of ALDS with Fe. By regulating the enzyme-like activity of MoS QDs, different colorimetric signal of a typical substrate of horseradish peroxidase, 3,3΄,5,5΄-tetramethylbenzidine, can be measured in the presence of HO. Based on this mechanism, we develop a colorimetric approach for the determination of ALDS and further applied in quality control of pharmaceutical products, utilizing either smartphone or UV-vis spectrometer as a readout. This detection method is rapid and selective, where derivatization of ALDS before detection is not needed. Such a smartphone-based colorimetric detection platform is promising to be applied in point-of-care testing at home, small clinics, or underdeveloped regions.
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| http://dx.doi.org/10.1016/j.colsurfb.2021.111953 | DOI Listing |
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