1. Isolation of powerful antioxidants from the medicinal halophyte Limoniastrum guyonianum
- Author
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Trabelsi, Najla, Oueslati, Samia, Falleh, Hanen, Waffo-Téguo, Pierre, Papastamoulis, Yorgos, Mérillon, Jean-Michel, Abdelly, Chedly, and Ksouri, Riadh
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MEDICINAL plants , *ANTIOXIDANTS , *HALOPHYTES , *ETHYL acetate , *CHROMATOGRAPHIC analysis , *FLAVONOIDS , *BUTYLATED hydroxytoluene , *ACETONITRILE - Abstract
Abstract: The antioxidant capacities of the crude extract, aqueous and ethyl acetate partitions of Limoniastrum guyonianum Boiss. (Zita) were investigated in this study. The ethyl acetate phase exhibited a significant antioxidant activity as judged by total antioxidant activity, DPPH test and reducing power. Fractionation of this extract by centrifugal partition chromatography (CPC) using quaternary Arizona solvent systems composed of n-heptane/ethyl acetate/methanol/water led to ten fractions. The antioxidant capacities of these fractions were assessed using the same previous tests. Fraction 8 showed the highest antioxidant capacity (1291.1mg GAE/g DR), the power ability to quench DPPH radical (IC50 =2μg/ml) and to reduce Fe3+ (EC50 =65μg/ml). From this fraction, three powerful flavonoids were isolated (1–3): gallocatechin (1), epigallocatechin (2) and epigallocatechin-3-O-gallate (3). These findings suggest that the antioxidative property of L. guynianum is may be related to the presence of these flavonoids, which can be used in various industrial fields. [Copyright &y& Elsevier]
- Published
- 2012
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