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Contribution to the study of therapeutic virtues of the local date extracts from the oasis of Ouargla (Northern East Algerian Sahara)

Zineb Sayah, Mohamed Didi Ould El Hadj, Tahar Idder, Saida Chaouche, Hamida Kemassi

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Int. J. Biosci.18(5), 124-133, May 2021

DOI: http://dx.doi.org/10.12692/ijb/18.5.124-133


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The object of this study is the phytochemical characterization and evaluation of the antioxidant, anti-hemolytic and antibacterial activity of extracts from three cultivars of the most abundant dates in Ouargla oasis: Ghars, Deglet-Nour, and Degla-Beida harvesting at “Tmar” stage (The last stage of date ripening). The Antioxidant activity was determined by the phosphomolybdic acid method and the reducing power test. The antihemolytic activity was evaluated in vitro by red blood cells’ capacity to resist the hydrogen peroxide attack. The antibacterial activity was tested in vitro by the diffusion disc method against six Gram-positive and Gram-negative pathogenic bacteria strains. The two realized antioxidant activity tests showed a strong antioxidant activity of the ethyl acetate extracts of the Ghars cultivar with 38,75 ± 18,03 mg ascorbic acid equivalents/100 g of dates. The study of the anti-hemolytic activity of dates revealed that the three studied cultivars of dates have an anti-hemolytic effect. Besides, the sensitivity test of the bacterial strains showed the activity of some extracts of the three date cultivars vis-a-vis the four strains: Enterococcus feacalis, Escherichia coli, Bacillus cereus, and Staphylococcus aureus. The maximum inhibition was obtained with ethyl acetate extract from dates of the cultivar Deglet-Nour (11,5 ± 0,50 cm diameter of inhibition) against Bacillus cereus. The results of this study show that the local dates produced in Ouargla oasis constitute a natural source of substances with biological activities. It is, therefore, necessary to sustainably preserve the traditional phoenicultural heritage of this oasis, which is in deterioration these days.


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Contribution to the study of therapeutic virtues of the local date extracts from the oasis of Ouargla (Northern East Algerian Sahara)

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