Turnip-based N-doped carbon quantum dots: Synthesis, photoluminescence properties and antibacterial activity against Staphylococcus Aureus
نویسندگان
1 Polymer Research Laboratory, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran
2 Department of Inorganic Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran
3 Polymer Research Laboratory, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran
4 Polymer Research Laboratory, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran
doi
10.48309/jmcs.2026.226888چکیده
The hydrothermal synthesis of carbon quantum dots (CQDs) from turnip (Brassica rapa) as a natural resource is reported. This represents an eco-friendly method of producing CQDs from a renewable and naturally abundant plant. The fluorescence emission of CQDs in different solvents (water, ethanol, carbon tetrachloride, and toluene) is investigated to determine the solvent polarity effect on fluorescence intensity, showing the highest intensity in nonpolar solvents (carbon tetrachloride and toluene). Additionally, the antibacterial activity of CQDs was evaluated against Salmonella typhimurium and Staphylococcus aureus bacteria using the agar well diffusion method. CQDs were N-doped and exhibited significant antibacterial activity against Staphylococcus aureus in both neat, and when doped with Cu(II), boosting antibacterial activity of Cu(II) against both bacteria. The minimum inhibitory concentration (MIC) of neat CQDs was 0.3 mg/L for Staphylococcus aureus. According to the results, it is concluded that turnip-based CQDs can be considered as a novel and eco-friendly material for optical and antibacterial applications.
