Zanthoxylum mezoneurispinosum Ake Assi and Zanthoxylum psammophilum Ake Assi are\nspecies endemic to Cote dâ??Ivoire. In this study, we determined, for the first time, the composition\nand biological activities of essential oils obtained from each of these plants. Essential oils were\nobtained by hydrodistillation from different organs of each plant with a Clevenger-type apparatus\nand analyzed by gas chromatography-mass spectrometry (GC-MS). Thirty-four components,\naccounting for more than 99.9% of the overall composition, were identified in the oils. The Z.\npsammophilum leaf and trunk bark oils exhibited two unusual methylketones, undecan-2-one and\ntridecan-2-one, whereas the root oil was rich in thymol and sesquiterpenoids. The Z.\nmezoneurispinosum leaf and trunk bark oils were rich in monoterpenoids, whereas\nsesquiterpenoids were predominant in the root oil. These samples produced, for the first time,\nsome new chemical profiles of essential oils. The oilsâ?? antioxidant activities were determined using\n2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging capacity and ferric reducing antioxidant\npower (FRAP) assays. The results showed that the essential oil isolated from roots of Z.\nmezoneurispinosum had the highest antioxidant activity, which is in accordance with the high\nthymol content of that oil. We also determined the lipoxygenase inhibitory activities of the\nessential oils. The results showed that all of the tested oils displayed high and close lipoxygenase\ninhibitory activities.
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