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Fluorescence stability characterization of CPNPs made by the ligand of R16. The relative fluorescence intensity of CPNPs, a) under different pH solutions, b) inside KCl solution with different concentrations, and c) under DI water as a function of time. d) The cytotoxicity of CPNPs (with Hek 293 as the model) as a function of mass concentration evaluated by MTT colorimetric assay.
