Résumé
Ce travail apporte une contribution à l’investigation et la valorisation d’une plante saharo-endémique: Myrtus nivellei Batt & Trab (Myrtaceae) et l’évaluation du pouvoir antioxydant et antimicrobien de l’extrait méthanolique de cette espèce récoltée in situ ainsi que celui de ses cals multipliés in vitro. Une série d’analyses spectrophotométriques ont été effectuées, montrant que l’extrait méthanolique de la plante récoltée in situ s’est avéré plus riche en polyphénols par rapport à l’extrait des cals multipliés in vitro. Il a éventuellement exprimé un bon pouvoir de capture des radicaux libres (EC50=0,98 mg/ml) et un très bon pouvoir inhibiteur de la peroxydation de l’acide linoléique estimé à 74,01%, qui s’est avéré largement supérieur à celui exprimé par l’acide ascorbique (50,57%) utilisé comme contrôle positif. Néanmoins, les extraits méthanoliques préparés à partir des cals ont exprimé le meilleur pouvoir réducteur du fer estimé à 66,71%. Une très bonne activité antimicrobienne a été enregistrée pour l’extrait de la plante récoltée in situ, particulièrement contre S. aureus (CMI=2,25 mg/ml), ainsi que S. pneumoniae, S. flexineri, S. typhi et C. albicans (CMI=4,5 mg/ml). Cependant, les extraits des cals avaient présenté un effet antimicrobien nul.
Abstract
This work provides a contribution to the investigation and valorization of the Sahara-endemic plant: Myrtus nivellei Batt & Trab and the evaluation of the antioxidant effect of methanolic extracts harvested in situ, and in vitro propagated calli of this plant. Several spectrophotometric analyzes were performed, showing that the in situ methanolic extract was richer in polyphenols than the in vitro methanolic extract. Also, It expressed a good power to scavenge free radicals (EC50 = 0.98 mg/ml) and a great capacity to inhibit the peroxidation of linoleic acid estimated as 74.01%, largely higher than the ascorbic acid (50.57%) used as a positif control. However, the methanolic extracts of calli expressed the best ferric reducing power estimated as 66.71%. A very good antimicrobial activity was recorded for the extract of the plant harvested in situ, particularly against S. aureus (MIC=2.25 mg/ml), also against S. pneumoniae, S. flexineri, S. typhi and C. albicans (MIC=4.5 mg/ml). However, the calli extracts had presented no anti-microbial effect.
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Touaibia, M., Chaouch, F.Z. Propriétés antioxydantes et antimicrobiennes des extraits de Myrtus nivellei Batt et Trab. obtenus in situ et in vitro . Phytothérapie 15, 16–22 (2017). https://doi.org/10.1007/s10298-015-1011-6
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DOI: https://doi.org/10.1007/s10298-015-1011-6