Antioxidant activity of polar lichens from King George Island (Antarctica)
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Antioxidant agents prevent reactive oxygen species, which can cause degenerative diseases. Natural antioxidants are preferred over many synthetic antioxidants, which can be toxic, for therapeutic applications. Five lichen species were collected from King George Island, Antarctica. Antioxidant activities as assessed by DPPH (1,1-diphenyl-2-picrylhydrazyl) free radical and ABTS•+ [2,2’-azinobis-(3-ethylbenzothiazoline-6-sulfonate)] radical scavenging capacities were determined and compared with those of commercial standards BHA (butylated hydroxyanisole) and trolox [(±)-6-hydroxy-2,5,7,8-tetramethylchromane-2-carboxylic acid]. The results indicated that two lichens exhibited comparatively high antioxidant activities with the remaining three exhibiting less activity. The antioxidant activity was concentration-dependent. When compared, the antioxidant activity of crude extracts from polar lichens to previously published data for tropical and temperate lichen species, we concluded that lichens of Antarctic origin may be the potent sources of strong antioxidant agents. Such species should be explored as novel sources of effective antioxidant metabolites.
This work was supported by a grant to the Korea Polar Research Institute, KOPRI, under project PE07050.
- Behera BC, Verma N, Sonone A, Hakhija U (2007) Tissue culture of some lichens and screening of their antioxidant, antityrosinase and antibacterial properties. Phytother Res (in press) (10.1002/ptr.2228)Google Scholar
- Behera BC, Verma N, Sonone A, Makhija U (2006) Determination of antioxidative potential of lichen Usnea ghattensis in vitro. Lebenson Wiss Technol 39:80–85Google Scholar
- Hall CA, Cuppett SL (1997) Structure-active of natural antioxidant. In: Auroma OI, Cuppett SL (eds) Antioxidant methodology in vivo and in vitro concepts. AOCS Press, Champaign, IL, pp 141–170Google Scholar
- Nash TH (1996) Lichen biology. Cambridge University Press, Grate Britain, pp 1–289Google Scholar
- Vstedal DO, Lewis Smith RI (2001) Lichens of Antarctica and South Gerogia. Cambridge University Press, Cambridge, pp 77–366Google Scholar
- Yamamoto Y, Mizuguchi R, Takayama S, Yamada Y (1987) Tissue cultures of Usnea rubescense and Ramalina yasudae and production of usnic acid in their cultures. Agric Biol Chem 49:3347–3348Google Scholar
- Yilidirim A, Oktay M, Bilaloglu V (2001) The antioxidant activity of the leaves of Cydonia vulgaris. Turk J Med Sci 31:23–27Google Scholar