Study of Chemical Composition, Antioxidant and Antimicrobial Activities of Oudneya africana Oils from Stems, Leaves, and Flowers

摘要

This work is dedicated to the study of the plant Oudneya africana, the endemic plant, from the family of Brassicaceae. This plant is notably found in the Sahara area. The extraction, the antimicrobial and the antioxidant activities were realized for stems, leaves, and flowers. Hydrodistillation techniques used for the extraction of essential oil. Flowers contain the highest yield 5.75 %. The determination of the humidity showed that the leaves of Oudneya africana contain approximately half of their weight of water. The chemical analysis of essential oil by GC-MS shows that stems contain 28 compounds, leaves contain 43 compounds and flowers contain 12 compounds. The flavonoids and phenolics contents are ranged from 148 +/- 29.44 (for stems) to 77.03 +/- 24.5 mu g/ml (for flowers) and from 238.8 +/- 23.71 (for leaves) to 33.03 +/- 13.79 mg/ml (for stems). For the DPPH (1,1-dipheny1-2-picrylhydrazyl) assay, the oils of the three parts showed various antioxidant activities. The most active part was the leaves, with an IC50 value of 51.25 mu g/l, followed by flowers (IC50 = 40.37 mu g/l). The essential oils showed significant antibacterial activities against Gram-positive and Gram-negative bacteria, but with various activity levels.