Assessment of antibacterial activity of vinyltriphenylphosphonium hexabromoplatinate

Abstract

Introduction. One of the biological effects of platinum compounds is antibacterial action against Gram-positive and Gram-negative bacteria. Thus, some platinum compounds may inhibit the synthesis of DNA, RNA and proteins in Escherichia coli cells.Aim — to study the antibacterial effect of vinyltriphenylphosphonium hexabromoplatinate (VH) against E. coli and Staphylococcus aureus bacteria.Materials and methods. The antibacterial effect of VH was studied by the quantitation of the grown colonies of E. coli strain ATCC 25922 and S. aureus strain ATCC 6538 on a nutrient medium in test (suspension of microorganisms, solution of the test substance) and control (suspension of microorganisms). The significance of differences between the outcomes in test and control groups was estimated by two-sided Fisher's exact test.Results. The minimum inhibitory concentration of VH solution for E. coli strain ATCC 25922 was 14,0625 µg/ml, for S. aureus strain ATCC 6538 — 225 µg/ml.Conclusion. VH exhibits a more pronounced antibacterial effect against E. coli compared to S. aureus — the minimum inhibitory concentration of VH observed for E. coli (14,0625 µg/ml, 11,17 µM) is comparable to the effective concentrations of platinum antitumor compounds — therefore, further studies with this bacterium, including in vivo studies, are promising.