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Confocal laser microscopic images of E. coli (A) without and with (B) CQDs-1 (50 mg GNP + 50 mg glucose), (C) CQDs-2 (50 mg GNP + 50 mg extracted gardenia seed), and (D) CQDs-3 (50 mg GNP + 50 mg gardenia seed) prepared at 220 °C (25.6 mg/mL) after incubation at 37 °C for 6 h: bright-field and fluorescence mode at excitation wavelengths of 365, 475, and 532 nm.
