Effect of nitrogen-doped carbon quantum dots on the growth of photosynthetic bacteria [掺氮碳量子点对光合细菌生长过程的影响]

作者：Zhou Y.-L.; Yue Z.-B.; Hu F.-P.; Wang J.^*

来源：China Environmental Science, 2019, 39(8): 3396-3403.

• Cytotoxicity
• N-CQDs
• Photosynthetic bacteria
• Photosynthetic pigment

Nitrogen-doped carbon quantum dots (N-CQDs) were formed by one-step hydrothermal synthesis, using citric acid as carbon source and ethylene diamine as modifier in this study. The effects of N-CQDs on the growth of photosynthetic bacteria Rhodopseudomonas acidophila were investigated by analyzing the physiological indexes of photosynthetic pigment, protein and malondialdehyde. The results showed that N-CQDs inhibited the growth of R. acidophila and showed a concentration-effect relationship. Additionally, N-CQDs increased the content of carotenoid in R. acidophila while it decreased the content of bacteriochlorophyll. Furthermore, spectra analysis results showed that N-CQDs led to the leakage of intracellular sbustances such as photosynthetic pigment and protein. The strong light-induced electron transfer ability of N-CQDs resulted in excessive free radicals in the culture system of R. acidophila, which led to a series of lipid peroxidation reactions, which in turn led to the rupture of biofilms, material leakage and bacterial death. N-CQDs had a high toxicity on R. acidophila under light. The results of this study are valuable for understanding the phototoxicity and ecological effects of N-CQDs.

• 单位
  合肥工业大学