Investigation of antimicrobial and antioxidant properties of Dermatocarpon miniatum (L.) W. Mann (Verrucariaceae) and Xanthoparmelia conspersa (Ehrh. Ex Ach.) (Hale) (Parmeliaceae) lichens

Antimicrobial activities of ethanol and acetone extracts of Dermatocarpon miniatum and Xanthoparmelia conspersa lichens were investigated by disc diffusion and Minimum Inhibitory Concentration (MIC) methods. Antioxidant activities of the extracts were evaluated by using DPPH radical scavenging activity, ABTS radical scavenging activity, metal chelating activity, total antioxidant capacity, total phenolic conent and total fla antimicrobial effect against all bacteria except for Escherichia coli and Salmonella enterica. When compared antimicrobial efficiency of the tested lichens, it is concluded X. conspersa lichen is more active than D. miniatum lichen. DPPH radical scavenging activity of the extracts are increased in the following order: X. conspersa ethanol extract>D. miniatum acetone extract>D. miniatum ethanol extract>X. conspersa acetone extract. Studied lichen extracts showed relatively weak metal chelating activity. It is concluded that D. miniatum and X. conspersa lichen extracts can be alternative antimicrobial l snd antioxidant agents because they exhibit antimicrobial and antioxidant activities.