Potential Application and Bactericidal Mechanism of Lactic Acid–Hydrogen Peroxide Consortium
- 100 Downloads
It has been found that lactic acid and hydrogen peroxide (H2O2) displayed co-operatively enhanced killing activity to pathogens. The synergistic effect was investigated with using several microbe species, suggesting that low concentration of lactic acid and H2O2 could kill both Gram-negative and Gram-positive bacteria or even fungal pathogens. To explore the mechanism of synergistic sterilization of lactic acid and H2O2, Escherichia coli DH5α was used as the indicator bacteria. Lactic acid and H2O2 could generate hydroxyl radicals depending on the intracellular iron ions. The genomic DNA of treated cells was fractured and dispersed, and the △recA strain was more susceptive to the treatment, indicating that DNA damage was a cause of cell death. Furthermore, serious leakage of cell contents occurred in the treated cell, suggesting that the treatment also resulted in cell membrane permeability changes. This research shows that lactic acid-H2O2 consortium is a hopeful safety bactericide in agriculture or food production processes and provides a greater understanding of the mechanism of synergistic sterilization of lactic acid-H2O2 consortium in vivo.
KeywordsLactic acid Hydrogen peroxide Broad spectrum Intracellular iron ions Genomic DNA damage Membrane permeability
This work was supported by the National Natural Science Foundation of China (No. 31801565), the National Key Research and Development Program of China (2017YFD0400300), and the Natural Science Foundation of Jiangsu Province (CN) (BK20180910).
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
- 7.Atassi, F., & Servin, A. L. (2010). Individual and co-operative roles of lactic acid and hydrogen peroxide in the killing activity of enteric strain Lactobacillus johnsonii NCC933 and vaginal strain Lactobacillus gasseri KS120.1 against enteric, uropathogenic and vaginosis-associated pathog. FEMS Microbiology Letters, 304(1), 29–38.CrossRefGoogle Scholar
- 20.Lee, P. Y., Costumbrado, J., Hsu, C. & Kim, Y. H. (2012). Agarose gel electrophoresis for the separation of DNA fragments. Journal of Visualized Experiments, 20(62), e3923–e3923. Google Scholar
- 21.Zhang, C., Xin, Y., Wang, Y., Guo, T., Lu, S., & Kong, J. (2015). Identification of a novel dye-decolorizing peroxidase, EfeB, translocated by a twin-arginine translocation system in Streptococcus thermophilus CGMCC 7.179. Applied and Environmental Microbiology, 81(18), 6108–6119.CrossRefGoogle Scholar
- 28.Lushchak, V. I. (2011). Toxicology & pharmacology : CBP, 153, 175–190.Google Scholar