Abstract
In this work we aimed to test the antibacterial effect of many copper and bismuth powders (salts) on Gram positive and Gram negative bacterial species. Eight samples of [(xB2O3(1-x)Bi2O3]10%CuO and another eight of [(xB2O3(1-x)Bi2O3] with various granulations (0.07x0.8), were tested in laboratory conditions on four bacterial strains (Staphylococcus aureus, Bacillus cereus Pseudomonas aeruginosa and Escherichia coli), determining minimum inhibitory concentration (MIC) using diffusimethrical method. It was proved that both copper and bismuth salts had inhibitory effect on the tested bacterial species. Gram positive bacteria (Staphylococcus aureus and Bacillus cereus) were sensitive to the activity of cooper salts combined with bismuth. Gram negative bacteria (Pseudomonas aeruginosa and Escherichia coli) were also sensitive to the activity of the two powder categories but the inhibitory effect was more reduced comparatively to the effect obtained for Gram positive strains. A reduced dimension of the powders increases the inhibitory effect.
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