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Antioxidant activity of Knipholone anthrone

Antioxidant activity of Knipholone anthrone

Habtemariam, Solomon (2007) Antioxidant activity of Knipholone anthrone. Food Chemistry, 102 (4). pp. 1042-1047. ISSN 0308-8146 (doi:10.1016/j.foodchem.2006.06.040)

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Knipholone (KP) and knipholone anthrone (KA) are natural 4-phenylanthraquinone structural analogues with established differential biological activities including in vitro antioxidant and cytotoxic properties. By using DNA damage as an experimental model, the comparative Cu(II)-dependent prooxidant action of these two compounds were studied. In the presence of Cu(II) ions, the antioxidant KA (3.1-200 microM) but not KP (6-384 microM) caused a concentration-dependent pBR322 plasmid DNA strand scission. The DNA damage induced by KA could be abolished by reactive oxygen species scavengers, glutathione and catalase as well as EDTA and a specific Cu(I) chelator bathocuproine disulfonic acid. In addition to Cu(II) chelating activity, KA readily reduces Cu(II) to Cu(I). Copper-dependent generation of reactive oxygen species and the subsequent macromolecular damage may be involved in the antimicrobial and cytotoxic activity of KA.

Item Type: Article
Uncontrolled Keywords: knipholone anthrone, Kniphofia foliosa, antioxidant activity, DPPH, reducing power, superoxide anion, hydroxyl radical, iron chelation, DNA damage
Subjects: Q Science > QD Chemistry
T Technology > TX Home economics
Faculty / Department / Research Group: Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
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Last Modified: 09 Dec 2016 15:42

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