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## Materials and Reagents Glucose, glycine and L-tryptophan were purchased from Sigma Aldrich (Shanghai, China). DMEM, FBS, PBS, and trypsin were ordered from Gibco BRL (Carlsbad, CA, USA). Cell counting kit-8 assay (CCK-8) were purchased from Beyotime Institute of Biotechnology. Polypeptidoglycan, lipoteichoic acid (Sigma-Aldrich, St. Louis, MO, USA) and lipopolysaccharide (Sigma-Aldrich, St. Louis, MO, USA) were used as model molecules. Bacterial strains used for the Gram-positive bacteria selectivity tests was purchased from Shanghai fuxiang Biotechnology Co.,Ltd (China). 300 400 500 600 700 800 10 1 10 2 10 3 10 4 10 5 10 6 10 7 Counts Wavelength (nm) Emission of the references Emission of the pure D-CQDs 300 400 500 600 700 800 Counts Wavelength (nm) Emission of the references Emission of the pure S-CQDs 300 400 500 600 700 800 Counts Wavelength (nm) Emission of the references Emission of the pure T-SCQDs Absolute QY (%)

Publisher

American Chemical Society (ACS)

Language

EN