Journal
FOOD CHEMISTRY
Volume 97, Issue 1, Pages 109-114Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2005.03.032
Keywords
antioxidant activity; Coleus aromaticus; free radicals; scavenging effect
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The leaves of Coleus aromaticus Benth., (Larniaceae), commonly called Indian Borage, are often eaten raw with bread and butter. The chopped leaves are also used as a substitute for sage (Salvia officinalis Linn.) in stuffing. In the present study, the antioxidant potency of freeze-dried aqueous extract of C aromaticus was investigated, employing various established in vitro systems, such as the beta-carotene-linoleate model system, 1,1-diphenyl-2-picrylhydrazyl (DPPH)/superoxide/nitric oxide radical scavenging, reducing power, and iron ion chelating activity. Freeze-dried aqueous extract of C aromaticus (CAE) showed notable inhibitory activity in the beta-carotene-linoleate model system. Furthermore, CAE exhibited a moderate concentration-dependent inhibition of the DPPH radical. The multiple antioxidant activity of CAE was evident as it showed significant reducing power, superoxide scavenging ability, nitric oxide-scavenging activity and also ferrous ion chelating potency. The data obtained in the in vitro models clearly establish the antioxidant potency of freeze-dried extract of C aromaticus. (c) 2005 Elsevier Ltd. All rights reserved.
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