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Antioxidant Activities of Bacterial Culture Extracts Isolated from Arctic Lichens

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Antioxidant Activities of Bacterial Culture Extracts Isolated from Arctic Lichens
Other Titles
북극 지의류로부터 분리한 미생물 배양 추출액의 항산화 활성
Kim, Mi-Kyeong
Oh, Tae-Jin
Park, Hyun
Life Sciences & Biomedicine - Other Topics
ABTS; Arctic lichen; antioxidant activity
Issue Date
Kim, Mi-Kyeong, Oh, Tae-Jin, Park, Hyun. 2012. "Antioxidant Activities of Bacterial Culture Extracts Isolated from Arctic Lichens". Korean J. Microbiol. Biotechnol, 40(4): 333-338.
Lichens are a symbiosis between fungi, algae and cyanobacteria. Our group recently studied the antioxidant properties of some bacterial species isolated from Arctic lichens and we confirmed that they possess high antioxidant activities. In this paper, we investigated the antioxidant capacity of 5 microorganisms newly isolated from 4 Arctic lichen species, Cladonia sp., Sterocaulon sp., Umbilicaria sp. and Cetraria sp., using various solvent extractions. We carried out 1,1-diphenyl-2-picryl-hydrazyl (DPPH) and 2,2-azino-bis(3-ethyl benzothiazoline- 6-sulphonic acid) (ABTS) free radical scavenging activity test and ferric reducing antioxidant power (FRAP) assay. Also total phenolic and flavonoid content assays were performed. Among the bacterial culture extracts of the tested lichen-microorganisms, ethyl acetate extracts of Burkholderia sordidicola S5- B(T) had not only a high antioxidant activity (72.9%) when compared with the ascorbic acid used as the control (51.3%) in the DPPH assay, but also a high amount of phenolic content as well as flavonoid content. As a result, these lichen-microorganisms may be potentially useful sources of natural antioxidants.
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