Antibacterial and Antioxidant Capacity of Polar Microorganisms Isolated from Arctic Lichen Ochrolechia sp.
Mi-Kyeong Kim, Hyun Park, Tae-Jin Oh Pol J Microbiol 2014; 63 (3): ICID: 1122690 Article type: Original article IC™ Value: 10.00
Abstract provided by Publisher
Although many scientists have been studying lichens, the bacterial communities in lichens have not been fully explored. In this study, the biological activities of bacterial isolates from Arctic lichen Ochrolechia sp. were screened. Cell cultures were extracted using ethyl acetate and tested for antibacterial and antioxidant activities. PAMC26608 (Sphingomonas sp., similarity: 99.104%) showed strong antibacterial activities in that its inhibition zone diameter (mm) was 10 to 12 and its MIC value ranged from 222.0 to >1000 ug/ml. PAMC26625 (Sphingomonas sp., similarity: 99.108%) showed a high amount of total phenolic and total flavonoid contents within 5 extracts and also exhibited 77.23% and 80.02% in the 1,1-diphenyl-2-picryl-hydrazyl assay and the 2,2'-azino-bis(3-ethyl benzothiazoline-6-sulphonic acid) assay, respectively. In the ferric reducing antioxidant power assay, it was determined that PAMC26625 contains a higher amount of ferrous ion [8.72 mM Fe(II)/mg extract] than control ascorbic acid [6.21mM Fe(II)/mg extract]. Our data indicate that they have potential to be used as novel sources of antibacterials and antioxidants.