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A Report on the In Vitro Antioxidant Properties of Vachellia karroo Leaf Extract: A Plant Widely Grazed by Goats in the Central Eastern Cape of South Africa

Department of Livestock and Pasture Science, University of Fort Hare, Private Bag X1314, Alice 5700, South Africa
Fort Cox College of Agriculture and Forestry, P.O. Box 2187, King William’s Town 5600, South Africa
Author to whom correspondence should be addressed.
Academic Editor: Marc A. Rosen
Sustainability 2017, 9(2), 164;
Received: 21 December 2016 / Revised: 15 January 2017 / Accepted: 19 January 2017 / Published: 15 February 2017
(This article belongs to the Special Issue Sustainable Development Initiatives towards Poverty Alleviation)
PDF [211 KB, uploaded 15 February 2017]


The polyphenolic constituents and antioxidant activity of aqueous and acetone extracts of Vachellia karroo leaves were determined in order to evaluate its efficacy in scavenging radicals such as DPPH, ferric reducing power and nitric oxide as an antioxidant model. The flavonols and flavonoid and phenolic content of the leaf extracts were also accessed using benchmark phytochemical reaction methods. Results of the phytochemical analyses revealed the presence of flavonoids and flavonol and phenolic compounds in the leaf extracts. The total phenolic content values in the aqueous and acetone leaf extracts were 7.40 and 11.09 mg tannic acid equivalent/g of extract powder, respectively. The total flavonol and flavonoid content values of the aqueous leaf extracts were 9.90 and 53.23 mg quercetin equivalent/g of extract, respectively, while those of the acetone leaf extracts were 1.18 and 5.18 mg quercetin equivalent/g of extract, respectively. At 0.2 mg/mL, the values for the scavenging activities of the acetone and aqueous extracts of the V. karroo leaves were significantly higher (p < 0.05) than that of the ascorbic acid but comparable to BHT against ferric oxide radicals. The findings from the study reveal that the antioxidative potentials of V. karroo leaf extract and could serve as free radical inhibitors, possibly acting as principal antioxidants. View Full-Text
Keywords: browse plant; polyphenolics; antioxidants; free radicals browse plant; polyphenolics; antioxidants; free radicals
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Idamokoro, E.M.; Masika, P.J.; Muchenje, V. A Report on the In Vitro Antioxidant Properties of Vachellia karroo Leaf Extract: A Plant Widely Grazed by Goats in the Central Eastern Cape of South Africa. Sustainability 2017, 9, 164.

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