Phytochemical study, polyphenols determination and evaluation of antioxidant activity of Origanum compactum and Satureja calamintha nepeta from the region of Ouazzane (Morocco)
Abstract
Among natural remedies, aromatic and medicinal plants constitute an essential source that deserves scientific attention. Thus, our study aims to promote the virtues of two aromatic and medicinal plants found in the wild in the region of Ouazzane (Morocco). The phytochemical tests of these species have shown the presence of flavonoids, gallic and catechic tannins, cyanidin, sterols and triterpenes. However, alkaloids, carotenoids, saponosides and reducing compounds were not detected. Then, extraction of total polyphenols from Origanum compactum and Satureja calamintha nepeta was conducted for 48 hours by maceration with a mixture of methanol/water (80/20) used as a solvent. Extractions yielded 35.2% crude extracts for Origanum compactum and 34.4% for Satureja calamintha nepeta. The fractionation of these crude methanol extracts was performed with three organic solvents of increasing polarity (chloroform, ethyl acetate then, n-butanol). Total phenol content of the extracts and fractions was assessed by the method of Folin-Ciocalteu. This revealed that the phenol-rich fractions were the crude extract for Origanum compactum and the butanol fraction for Satureja calamintha nepeta. Finally, the evaluation of the antioxidant power which was carried out using the method of trapping the free radical DPPH• and the reduction of iron by the method of FRAP. The DPPH• test showed a high antioxidant activity of the samples: 53.1 µg/ml of crude extract of Origanum compactum was needed to reduce 50% of DPPH•. The same IC50 was obtained for ascorbic acid (standard antioxidant). For Satureja calamintha nepeta, the IC50 was 67.5 µg/ml. On the other hand, the FRAP test revealed that the methanolic extract of origanum compactum has higher reducing power than that of n-buthanolic extract of satureja calamintha nepeta. Still, it remains relatively low compared to ascorbic acid. The high antioxidant activity of these two species could justify their use in traditional medicine for the treatment of many diseases.
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DOI: http://dx.doi.org/10.13171/mjc104020041156mh
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