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        Bioresource-derived multifunctional carbon quantum dots as a fluorescence and electrochemical sensing platform for picric acid and noncytotoxic food storage application

        Bony K. John,Chinnu R. Thara,Binila K. Korah,Neenamol John,Beena Mathew 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-

        This work deals with the synthesis of facile, water-soluble, and blue-emitting carbon quantum dots(CQDs) from Plumbago indica leaves by a hydrothermal method with a quantum yield of 16 %. The biomassPlumbago indica leaves exhibit several advances such as easy availability, cost-effectiveness, nontoxic,green source, and not requiring any sophisticated techniques to develop the sensor. The optical,morphological, structural, and compositional properties of the CQDs were confirmed by various characterizationmethods. As a fluorescent probe, CQDs exhibited good linear response to picric acid (PA) with alimit of detection (LOD) of 18 nM. The sensing mechanism involves a combination of static quenching andfluorescence resonance energy transfer (FRET). In the electrochemical sensing method, the differentialpulse voltammetric (DPV) technique was performed using a CQD-modified gold electrode with a LODof 0.35 nM for PA. Using fresh carrots as a model sample, the antioxidant activity of PVA, CQD, and aPVA-CQD mixture was qualitatively determined. The in vitro cytotoxicity analysis of CQDs by MTT assayusing the L6 cell line confirmed its non-toxic behaviour. This work is noteworthy because it offers a newattempt to identify toxic PA from biomass-derived precursor material and finds future applications in thefood industry.

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