The promoting mechanism of sodium lactate co-metabolism on the degradation of tetrabromobisphenol A by Pseudomonas aeruginosa NY3
ZHANG Qi1, NIE Hong-yun1,2, GUO Di-ni1, CHEN Li-jiao1, NIE Mai-qian1,2, WANG Lei1,2, WANG Lei3
1. Faculty of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2. Key Laboratory of Membrane Separation, Xi'an 710055, China; 3. Shaanxi Environmental Monitoring Center, Xi'an 710054, China
Abstract：Degradation of TBBPA by Pseudomonas aeruginosa NY3 was improved through the co-metabolism of sodium lactate, and its promoting mechanism was studied. The results showed that, when the non co-metabolic carbon source system was as the control, degradation efficiency of TBBPA in the system with sodium lactate as co-metabolic carbon source was improved significantly at 48h, with an increase of approximately 74%. Further study revealed that, the TBBPA degrading active substances in the sodium lactate co-metabolism system are distributed both intracellular and extracellular. Compared to that without co-metabolic carbon source, the biomass of Pseudomonas aeruginosa NY3, as well as the level of reactive oxygen species, such as hydrogen peroxide, superoxide anion radical and hydroxyl radical in its extracellular fluid, were increased by the co-metabolism of sodium lactate. The increase in reactive oxygen species levels in extracellular fluid mainly related to the secretion of small molecule secretions such as phenazines and quinolones by Pseudomonas aeruginosa NY3. In summary, sodium lactate co-metabolism promotes the degradation of TBBPA by Pseudomonas aeruginosa NY3 through both intracellular and extracellular pathways.
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ZHANG Qi, NIE Hong-yun, GUO Di-ni, CHEN Li-jiao, NIE Mai-qian, WANG Lei, WANG Lei. The promoting mechanism of sodium lactate co-metabolism on the degradation of tetrabromobisphenol A by Pseudomonas aeruginosa NY3. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 739-746.
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