Journal
POLAR BIOLOGY
Volume 32, Issue 7, Pages 1033-1040Publisher
SPRINGER
DOI: 10.1007/s00300-009-0602-9
Keywords
Antarctic lichens; Antioxidant activity; Bioresources; Lecanoric acid; Umbilicaria antarctica
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Funding
- Korea National Research Resource Center Program [R21-2007-000-10033-0]
- P-Science Program [R01-2006-000-11055-0]
- Korean Science and Engineering Foundation (KOSEF), Korea
- National Research Foundation of Korea [R21-2007-000-10033-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Eight lichen species, Cetraria aculeata, Cladonia furcata, Pseudephebe pubescens, Sphaerophorus globosus, Stereocaulon alpinum, Umbilicaria antarctica, Usnea antarctica and Usnea aurantiacoatra, were collected from King George Island, maritime Antarctica, for the evaluation of antioxidant activities. Anti-linoleic acid peroxidation activity, free radical scavenging activity, reducing power and superoxide anion scavenging activity were assessed of methanol and acetone extract of the lichens in vitro. Extract of Umbilicaria antarctica, Cladonia furcata, Sphaerophorus globosus and Usnea antarctica were found to have strong in vitro antioxidant properties. In general, acetone extract exhibited stronger activities than methanol extract. The activity-guided bioautographic TLC and HPLC analysis demonstrated that lecanoric acid was the main antioxidant compound in the acetone extract of Umbilicaria antarctica, the most potent antioxidant lichen species among the test species. The results suggested that several Antarctic lichens and their substances can be used as novel bioresources of natural antioxidants.
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