| Abstrakt: |
In this study, seasonal evolution and variability of the chemical composition of the fatty acids and tocopherols (isoforms) obtained from the leaves of Pistacia lentiscusgrowing in Algeria were investigated. Furthermore, quantified total tocopherol and total sterol contents were monitored during the same season. Besides, the antioxidant activity of the lipids was also investigated. The identification of the fatty acid methyl esters FAMEs showed some clear variability of the composition. The range variation of main saturated fatty acids SFA detected were: myristic acid (C14:0 = 2.94–16.61%), palmitic acid (C16:0 = 5.31–15.98%), capric acid (C10:0 = 0–13.88%), lauric acid (C12:0 = 0–8.09%), and arachidic acid (C20:0 = 0–7.07%). On the other hand, the main unsaturated fatty acids USFA were α-linolenic acid (C18:3 = 5.04–48.92%) which is known for its multiple dietary, pharmaceutical and clinical benefits, followed by linoleic acid (C18:2 = 5.49–16.99%), and oleic acid (C18:1 = 3.42–14.90%). The highest content of C18:3 was obtained in January. Major compounds showed different roads of evolutionary patterns. Surprisingly, antioxidant activity determined using two different assays (DPPH and β-carotene) revealed no significant variations for each of the tests during the same season. The variability of the contents of the fatty acids was discussed using clustering analysis (four distinguished clusters). As a main result, the maximum percentages of C18:3 and δ-tocopherol were dependent on the season of collection. In conclusion, this study illustrates the nutritional potential of the oil of P. lentiscusleaves, and gives valuable informations about the season variability of the lipid metabolites, which can provides some real opportunities for rational exploitation in the food industry or for medicinal purposes. |
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