Abstract:The carbon quantum dots (CDs) were obtained from Coca-Cola directlyby concentration and dialysisfor the first time in this study. The structure of CDs was characterized by transmission electron microscopy (TEM), ultraviolet spectrophotometer (UV), infrared spectroscopy (IR) and fluorescence spectrophotometer, and the antibacterial activity was investigated by microorganism meathod. The results showed that CDs had a narrow particle size distribution and a good monodispersity, and the surface was rich in hydroxyl and carboxyl groups, which made it have a high solubility. The CDs have no inhibitory effect on single cell organisms such as Escherichia coli, Staphylococcus aureus, Candida albicans, Bacillus subtilis and Pseudomonas aeruginosa. In addition, the colonies of Escherichia coli and Staphylococcus aureus were significantly increased near the pore of culture medium when the concentration of CDs was greater than or equal to 100 mg/L, suggesting that CDs were beneficial to their growth but had no significant effect on the other three kinds of bacteria The results obtained in this study were of great significance for further expanding the synthesis pathway of CDs and the later applicantions.
