Abstract
Enrichment of biomass containing high lipid content is the key limiting step for the utilization of cyanobacterial feedstock in biodiesel production. This study investigated the influence of antibiotics on the biodiesel productivity of a model biodiesel-producing cyanobacterium (Synechocystis sp. PCC 6803) through a 18-day exposure test and observed that 100 ng/L of ciprofloxacin, amoxicillin, and spiramycin significantly (p < 0.05) increased biomass, chlorophyll a content, and Fv/Fm value and rETRmax value in Synechocystis sp. PCC 6803. Due to the stimulation of photosynthesis, the 18-day dry weights of the cyanobacterial cells increased from 0.354 ± 0.039 to 0.508 ± 0.048, 0.58 ± 0.028, and 0.66 ± 0.028 g/L under exposure to ciprofloxacin, amoxicillin, and spiramycin, respectively. As a stress response to antibiotics, the lipid content in Synechocystis sp. PCC 6803 increased from 14.71 to 20.92%, 20.59%, and 15.36% under exposure to ciprofloxacin, amoxicillin, and spiramycin, respectively. Due to the increase of biomass and lipid content, the lipid productivity of Synechocystis sp. PCC 6803 increased from 2.89 to 5.90, 6.63, and 5.63 mg/L/d under exposure to ciprofloxacin, amoxicillin, and spiramycin, respectively. Exposure to each target antibiotic increased the proportion of monounsaturated fatty acids in the lipid, while exposure to spiramycin reduced the proportion of saturated fatty acid. Antibiotics regulated the lipid composition of Synechocystis sp. PCC 6803 towards an increase of combustion property. This study proved that antibiotic exposure increased the lipid productivity of cyanobacteria through hormesis, which provided new insights for promoting the production of cyanobacteria-based biodiesel.
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This study was funded by the National Natural Science Foundation of China (51679130) and the Fundamental Research Funds of Shandong University (2017WLJH35).
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Investigation and original draft writing were performed by Mengwen Cui. Ying Liu was responsible for methodology and project administration. Jian Zhang was responsible for supervision. All authors read and approved the final manuscript.
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Cui, M., Liu, Y. & Zhang, J. The Variation of Growth Rate, Photosynthetic Activity, and Biodiesel Productivity in Synechocystis sp. PCC 6803 under Antibiotic Exposure. Bioenerg. Res. 13, 955–962 (2020). https://doi.org/10.1007/s12155-020-10114-x
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DOI: https://doi.org/10.1007/s12155-020-10114-x