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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.