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Selective detection of folic acid in the midst of other biomolecules using water-soluble AgInS2 quantum dots

Abstract

We herein report the detection of folic acid (FA) via the fluorometric method using water-soluble AgInS2 quantum dots (QDs). The optical analysis showed that the addition of FA to AgInS2 QDs results in significant, blue-shifted photoluminescence emission. A linear plot of the blueshift in the photoluminescence wavelength position against FA concentration was obtained in the range of 0.03–33 µM with the detection limit of 52 nM. Interference study showed the selective detection of FA in the presence of other biomolecules. The as-synthesized AgInS2 QDs can be employed as an optical sensor for the rapid detection of FA in aqueous solutions.

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Acknowledgments

The authors would like to thank UJ-Global Excellence Stature, National Research Foundation (N.R.F.) under Scarce Skills and Innovation scholarship, Competitive Programme for Rated Researchers (CPRR), Grant No. 106060, and University of Johannesburg research committee (URC) and Faculty of Science research committee (FRC) for financial support.

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Correspondence to Oluwatobi S. Oluwafemi.

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May, B.M.M., Parani, S., Rajendran, J.V. et al. Selective detection of folic acid in the midst of other biomolecules using water-soluble AgInS2 quantum dots. MRS Communications 9, 1306–1310 (2019). https://doi.org/10.1557/mrc.2019.124

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