Abstract
In this study, we propose a simple and versatile tri-modal (colorimetric, fluorometric, and electrochemical) means for detection of riboflavin using silver carbon dot (Ag@CD) nanoconjugates. Hydroxyl-rich carbon dot (CD) synthesized by microwave-assisted method using citric acid and PEG was used as reductant for Ag@CD formation. Effect of CD and AgNO3 concentration on Ag@CD synthesis was examined. Furthermore, we observed that the Ag@CD conjugates were capable of selectively detecting riboflavin. The sensing mechanism was based on aggregation of nanoconjugates as confirmed from scanning electron microscope micrographs. Red shifting of surface plasmon resonance peaks to around 550 nm concomitant with quenching and red shift of fluorescence peak was observed. Colorimetric assay showed a change in colour of assay mixture to red and detection limit of 2.5 µM was observed. In addition, electrochemical detection showed a high selectivity for riboflavin even in the presence of interfering analytes with a sensitivity of 1.56 µA/mM/cm2. This rationally designed tri-modal sensing platform offers simplicity of operation and faster detection which may be developed into a point-of-care diagnostic device.
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Acknowledgements
EP is thankful to DST for fellowship under DST-SERB NPDF fellowship (Grant number PDF/2017/000024). This research was supported by a DST-PURSE-II funding. The authors thank the Advanced Instrument Research Facility of the University for SEM facility.
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Priyadarshini, E., Rawat, K. & Bohidar, H.B. Multimode sensing of riboflavin via Ag@carbon dot conjugates. Appl Nanosci 10, 281–291 (2020). https://doi.org/10.1007/s13204-019-01090-6
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DOI: https://doi.org/10.1007/s13204-019-01090-6