Analysis of the effect of copper and zinc ions on Streptococcus pyogenes and Escherichia coli biofilms revealed significant differences in the effect of these metals in the form of sulfates or chlorides on biofilm formation. Zinc ions in low doses (salt concentration 0.005 M) inhibited the growth of S. pyogenes biofilms by 1.5 times. After increasing salt concentration to 0.05-0.5 M, the growth of biofilm was reduced by 2.5 times in comparison with the positive control. In case of E. coli biofilms, the inhibition was more pronounced: zinc sulfate in a concentration of 0.005 M reduced its growth by 4.6 times in comparison with the positive control. After increasing salt concentration, the growth of E. coli biofilm decreased by 6.8 times. In case of zinc chloride, zinc ions produced weaker effect and reduced biofilm growth by 2.2 and 5 times, respectively. Copper salts in a concentration of 0.005 M had practically no effect on the growth of S. pyogenes biofilm; with increasing salt concentration, the degree of inhibition was close to the effect of zinc. In case of E. coli biofilm, we observed a slight inhibition of the growth by low doses of copper ions (by 1.4-1.3 times); with increasing salt concentration the effect increased by 5.6 and 2.2 times for copper sulfate and chloride, respectively. Copper and zinc cations had no effect on mature biofilm.
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Translated from Byulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 169, No. 5, pp. 578-582, May, 2020
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Danilova, T.A., Danilina, G.A., Adzhieva, A.A. et al. Inhibitory Effect of Copper and Zinc Ions on the Growth of Streptococcus pyogenes and Escherichia coli Biofilms. Bull Exp Biol Med 169, 648–652 (2020). https://doi.org/10.1007/s10517-020-04946-y
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DOI: https://doi.org/10.1007/s10517-020-04946-y