Lecanoric acid,a secondary lichen substance with antioxidant properties from <Emphasis Type="Italic">Umbilicaria antarctica</Emphasis> in maritime Antarctica (King George Island) |
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Authors: | Heng Luo Yoshikazu Yamamoto Jung A Kim Jae Sung Jung Young Jin Koh Jae-Seoun Hur |
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Institution: | (1) Korean Lichen Research Institute, Sunchon National University, 315 Mae-gok dong, Suncheon, Jeonnam, 540-742, Korea;(2) Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita 010-0195, Japan |
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Abstract: | 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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Keywords: | Antarctic lichens Antioxidant activity Bioresources Lecanoric acid Umbilicaria antarctica |
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