Journal
FOOD CHEMISTRY
Volume 107, Issue 1, Pages 289-295Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2007.08.016
Keywords
Kappaphycus alvarezii; antioxidant activity; total phenolics; free radicals; reducing power
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Various solvent extracts of Kappaphycus alvarezii, an edible red seaweed (family Solieriaceae) were screened for total phenol content and antioxidant activity using 1,1-diphenyl-2-picrylhydrazyl (DPPH), ferrous ion chelating activity, reducing power and antioxidant activity assays in a linoleic acid system with ferrothiocyanate reagent (FTC). The total phenol content of different extracts of K. alvarezii varied from 0.683 +/- 0.040% to 2.05 +/- 0.038%. The radical-scavenging activity of ethanol extract was, as IC50 3.03 mg ml(-1), whereas that of the water extract was IC50 4.76 mg ml(-1). Good chelating activity was recorded for methanol extract (IC50 3.08 mg ml(-1)) wherein 67.0 +/- 0.924% chelation was obtained using 5.0 mg ml(-1) of extract. The reducing power of the samples was in the following order: BHT > methanol > ethanol > ethyl acetate > water > hexane. But, in the linoleic acid system, the ethanol extract proved superior to the synthetic antioxidants butylated hydroxytoluene (BHT). Hence, these extracts could be considered as natural antioxidants and may be useful for curing diseases arising from oxidative deterioration. (c) 2007 Elsevier Ltd. All rights reserved.
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