Fig. 5. (A) Schematic principle for the determination of GSH based on FRET of N,S-CDs and AuNPs; (B) The fluorescence spectra of N,S-CDs (19 μg mL⁻¹) in presence of different concentrations of AuNPs from 0 to 6.12 nM; (C) the fluorescence spectra of the N,S-CDs/Au NPs in the presence of different concentrations of GSH (0 μM to 528.3 μM). Reprinted by permission from Springer Nature: ref. 97 Copyright 2019.