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Tlili N.,Tunis el Manar University | Nasri N.,Tunis el Manar University | Khaldi A.,Unite de Recherche Gestion et Valorisation des Ressources Forestieres | Triki S.,Tunis el Manar University | Munne-Bosch S.,University of Barcelona
Journal of Food Biochemistry | Year: 2011

The contents of antioxidant compounds were examined in four commercial samples of caper, which is one of the most commonly found aromatics in the Mediterranean kitchen. Analyses were performed by using the colorimetric assay (total phenolic compounds and vitamin C) and high-performance liquid chromatography (rutin, carotenoids and tocopherols). Moreover, vitamin A activity (as retinol equivalents) was calculated. Phenolic compound contents ranged from 1151.6±19.8 to 2243.96±48.2mg/100g FW, while rutin contents ranged from 150.62±5.18 to 732.61±10.49mg/100g FW. Total tocopherol content was from 700.23±10.49 to 2555.41±71.12μg/100 FW, with α-tocopherol as the predominant isomer in all samples. β-carotene ranged between 84.8±9.5 and 805.71±17.73μg/100g FW. Capers also contained an appreciable amount of vitamin C. These results bring attention to the antioxidant vitamin value and nutritional importance of commercial caper. PRACTICAL APPLICATIONS: Results show that caper contain significant amounts of antioxidants (total phenolic compounds, rutin, tocopherols, carotenoids; and appreciable levels of vitamin C) as bioactive compounds. Irrespective of the variation between countries, commercial caper contained important contents of these compounds, thus showing caper has a great interest for its nutritional value. The combined contents of these antioxidants in commercial capers encourage consumers to increase their intake. Also, these results should be useful for researchers to explore and develop further this plant and its storage conditions for human consumption and medicinal uses. © 2011 Wiley Periodicals, Inc. Source

Nasri N.,Tunis el Manar University | Tlili N.,Tunis el Manar University | Triki S.,Tunis el Manar University | Elfalleh W.,Laboratoire dAridoculture et cultures oasiennes | And 2 more authors.
Journal of Essential Oil Research | Year: 2011

The composition of the essential oil hydro-distilled from needles of Pinus pinea L. trees, collected from six populations coming from Northern Tunisia was determined by GC and GC/MS analysis. Fifty-seven components, accounting for 94.4-99.9% of the oil were identified. As expected, the majority of the identified metabolites were found to be monoterpenes and sesquiterpenes. Monoterpenes account about 76% with 34 of 57 compounds identified. The principal component was limonene (35.9%) followed by α-pinene (6.4%). Sesquiterpenes (ca.19%) were mainly β-cubebene (1.8%), β-caryophyllene (1.7%), α humulene (1.7%) and β-farnesene (1.7%). Diterpenes (1.4%) were present in few concentrations mainly at one population. Data projection on axes of principal component analysis from P. pinea samples showed significant geographic polymorphism between Tunisian populations. This suggests that, using an appropriate wide-range sample of P. pinea populations, terpenes could be used to study the genetic diversity of P. pinea. This species has never shown a noticeable genetic variability using microsatellites, fatty acids or allozymes. © 2011 Allured Business Media. Source

Tlili N.,Tunis el Manar University | Nasri N.,Tunis el Manar University | Saadaoui E.,Unite de Recherche Gestion et Valorisation des Ressources Forestieres | Khaldi A.,Unite de Recherche Gestion et Valorisation des Ressources Forestieres | Triki S.,Tunis el Manar University
African Journal of Biotechnology | Year: 2010

Caper is a perennial shrub of the Mediterranean Basin. The most important economical species is Capparis spinosa. Sterols of C. spinosa seed oil isolated from seven Tunisian stands were identified and quantified. C. spinosa contained high levels of phytosterols (2240.4 mg/kg of total extracted lipids), of which β-sitosterol, with 1390 mg/kg, was the most abundant (57.53%). Campesterol and stigmasterol accounted for 382 and 265 mg/kg, respectively (17.05 and 11.85% of the total sterols, respectively). C. spinosa seed oil also contained a high level of 5-avenasterol (6%). We detect also brassicasterol (3.39 mg/kg). Cholesterol and campestanol are detected in much lower levels. These results bring attention to the richness of C.spinosa seed oil with sterols which are the most important class of the minor components. Source

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