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Fatty acids, 4-desmethylsterols, and triterpene alcohols from Tunisian lentisc (Pistacia lentiscus) fruits

Trabelsi H., Sakouhi F., Renaud J., Villeneuve P., Khouja M.L., Mayer P., Boukhchina S.. 2012. European Journal of Lipid Science and Technology, 114 (8) : p. 968-973.

A comparative study was performed to determine the fatty acid, 4-desmethylsterol and triterpenic alcohols compositions of three different Tunisian populations of Pistacia lentiscus fruit Rimel (RM), Korbous (KO), and Tebaba (TB). Fruits are rich in lipids, which varied from 39.37% (KO) to 42.48% (TB) on a dry weight basis. Qualitatively, fatty acid, sterol, mono- and dimethylsterol composition is identical for all populations. Oleic acid was the major fatty acid for all samples, accounting from 40.49% in TB population to 50.72% in RM population followed by the palmitic and linoleic acids. Other fatty acids are present at lower levels. Total sterol amount varied from 109.72 mg/100 g of oil (KO) to 434.26 mg/100 g of oil (RM) with an average of 248.74 mg/100 g of oil. The major 4-desmethylsterol component in all studied Tunisian populations of P. lentiscus oil was ß-sitosterol followed by campesterol in TB and KO, and by stigmasterol in RM. The amount of total triterpenic alcohols varied from 42.39 mg/100 g of oil in RM population to 70.41 mg/100 g oil in TB population. The quantitative difference in the fatty acids and 4-desmethylsterols of the different populations studied could be due to the effect of geographic region and soil type. (Résumé d'auteur)

Mots-clés : facteur édaphique; facteur du milieu; provenance; composition chimique; fruit; phytostérol; triterpénoïde; acide gras; pistacia lentiscus; pistache; tunisie

Thématique : Composition des produits alimentaires; Physiologie et biochimie végétales

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