Antimicrobial activity of cyanobacteria isolated from waste water containing boron [Borlu atik sulardan izole edilen siyanobakterilerin antimikrobiyal aktiviteleri]

Abstract

Objective: Cyanobacteria are Gram-negative prokaryotic microorganisms known as "blue-green algae" in terms of their photosynthetic pigments. They spread widely in a variety of aquatic habitats from Antarctica to geothermal fields. The toxins produced by some cyanobacterial species pose a threat to human and animal health. Primer metabolites such as protein, vitamin, fatty acids and pigments and seconder metabolites such as antibacterial, antifungal, antiviral, antiinflammatory, bioactive compounds with antihelminthic properties of some species have an important potential in health, medicine and biochemistry areas etc. In this study, it was aimed to investigate the antimicrobial activity potentials of cyanobacteria isolated from waste water containing boron against selected bacteria, yeast and filamentous fungi. Methods: Agar blocks with a 6 mm diameter were removed from cyanobacterial cultures grown on to the BG 11 medium were placed in petri dishes containing selected test microorganisms and let to incubation. At the end of the incubation time, inhibition zones formed around the agar blocks were measured. Results: Isolate 4 was the most effective cyanobacteria among the 30 cyanobacterial isolates. Isolate 4 was shown antimicrobial activity against to Enterobacter aerogenes with 20 mm, Bacillus cereus with 15 mm, Staphylococcus aureus with 14 mm, Candida glabrata with 21 mm, Aspergillus flavus with 28 mm, Aspergillus fumigatus with 20 mm, Aspergillus parasiticus with 30 mm, Fusarium solani with 22 mm inhibition zone diameters. Conclusion: According to our results, almost all of the cyanobacterial isolates were found to be effective against to majority of test microorganisms especially Enterobacter aerogenes and Yersinia enterocolitica bacteria, Candida albicans and Candida glabrata yeasts. It was aimed that the purification and identification of bioactive compounds responsible for antimicrobial activities in future works.