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Schematic illustrations of plant part-derived CDs for detecting AA, thiamine, and riboflavin. (a) The TMB oxidation and colorimetric detection of AA. (b) The “turn-on” effect on the FL intensity of CDs for the detection of AA and thiamine. (c) The FL-quenching behavior of CDs was observed after interacting the CDs with riboflavin through the FRET system. Abbreviations: AA, ascorbic acid; TMB, 3,3′,5,5′-tetramethylbenzidine; FRET, fluorescent resonance energy transfer.
