INVESTIGATION GENOTOXICITY OF NEW SILVER-BASED COMPLEXWITH ANTIMICROBIAL ACTIVITY

Objective: Investigation of genotoxicity effects of the new antibacterial silver-based compound with of general formula [Ag (CH2)6 N4]+NO3.Methods: The comet assay applied for assessment of genotoxic effects on leukocytes of mice blood. DNA damage was assessed on the percentage of DNA in a comet tail (tail DNA), under influence of silver complex in different concentrations.Results: During experiments found a significant increase in the level of DNA damage in cells, at the maximum tested concentrations. At low doses, the drug has no significant genotoxic effect.Conclusion: Tested silver complex did not cause DNA damage at low concentrations and could be considered as a base for new antibacterial drug.Â

Comparative Study of Genotoxicity of Silver and Gold Nanoparticles Prepared by the Electric Spark Dispersion Method

Objective: There is plenty of information dedicated to nanomaterial toxicity, but it is often contradictory. This work presents results of the comparative investigation of silver and gold nanoparticles genotoxicity and genotoxic effect of water medium after the spark dispersion process. Material and methods: The nanoparticles were produced in water by the modified energy-efficient electric spark dispersion method. The comet assay, transmission electron microscopy, DLS spectroscopy and thermal desorption of nitrogen (BET method) were used for the investigation. Results: The silver nanoparticles showed a genotoxic effect which appeared at concentration of 0.03 mg/ml and above. The application of gold nanoparticles did not lead to a significant DNA damage at concentrations range of 0.01 - 0.03 mg/ml. However, a notable level of genotoxicity was observed at concentrations of gold nanoparticles about 0.1 mg/ml. Supernatant water medium (with trace of Au and Ag metals) following the spark dispersion process showed no genotoxic action. Conclusion: Accordingly, the testing of the nanoparticles produced by the electric spark dispersion in water revealed more expressed genotoxic effect of silver nanoparticles in comparison with the gold ones

Investigation of DNA-damage and Chromosomal Aberrations in Blood Cells under the Influence of New Silver-based Antiviral Complex

Purpose: The problem of infectious diseases and drug resistance is becoming increasingly important worldwide. Silver is extensively used as an anti-infective agent, but it has significant toxic side effects. In this regard, it is topical to develop new silver compounds with high biological activity and low toxicity. This work is aimed to study DNA damage and chromosomal aberrations in blood cells under the influence of new silver-based compound of general formula C6H19Ag2N4LiO6S2, with antiviral activity. Methods: The comet assay was applied for the genotoxic affects assessment on mice blood leukocytes. DNA damage was determined bases on the percentage of DNA in a comet tail (tail DNA), under the influence of silver complex in different concentrations. Genotoxic effect of the tested substance on the somatic cells was determined by chromosomal aberration test of bone marrow cells of mice. Results: In the course of the experiments, no essential changes in the level of DNA damage in the cells were found, even at highest concentrations. The administration of the substance in doses up to 2.5 g/kg in mice did not cause any increase in the frequency of chromosomal aberration in bone marrow cells. Conclusion: Taking into account known silver drug genotoxic properties, the use of a given complexed silver compound has possible great advantages for potential applications in the treatment of infectious diseases