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Hosni K.,Institute National Of Recherche Et Danalyse Physico Chimique Inrap | Jemli M.,Institute National Of Recherche Et Danalyse Physico Chimique Inrap | Dziri S.,Institute National Of Recherche Et Danalyse Physico Chimique Inrap | M'rabet Y.,Institute National Of Recherche Et Danalyse Physico Chimique Inrap | And 6 more authors.
Industrial Crops and Products | Year: 2011

The effect of stage of maturity on total lipids, fatty acids, yields and essential oil composition and their antimicrobial and free radical scavenging activities of the Schinus molle fruits was investigated. The content of total lipids varied from 2.87 to 5.35%. (w/w, dw) and were rich in unsaturated fatty acids particularly linoleic acid. As maturation progress, the essential oil yield dropped from 5.18% to 1.15%. Monoterpene hydrocarbons with α-phellandrene (35.15-40.38%), limonene + β-phellandrene (21.47-36.62%), β-myrcene (7.61-24.96%) and α-pinene (1.92-2.58%) were found to be the main components. At the same time, the essential oils were evaluated for their antimicrobial and free radical scavenging activities. They were found to be active against Bacillus subtilis, Bacillus cereus, Salmonella typhymurium and Escherichia coli but they do not inhibit the growth of Candida albicans. Conversely, they showed very weak activity against the DPPH radical. In both assay, the oil derived from the intermediate stage was reported as more efficient. © 2011 Elsevier B.V. Source


Zahed N.,Ecole Superieure DAgriculture de Mograne | Hosni K.,Ecole Superieure DAgriculture de Mograne | Ben Brahim N.,Institute National Of Recherche Agronomique Of Tunis Inrat | Kallel M.,University of Sfax | Sebei H.,Ecole Superieure DAgriculture de Mograne
Acta Physiologiae Plantarum | Year: 2010

Gas chromatography-flame ionisation detection (GC-FID) and gas chromatography-mass spectrometry (GC-MS) analyses of the essential oils of leaves and fruits of the ornamental Shinus molle L. were reported and their allelopathic effect on wheat (Triticum aestivum L.) was evaluated. Qualitative and quantitative differences between fruit and leaf oils were observed. Both oils were rich in monoterpene hydrocarbons and the major constituents were limonene and β-phellendrene (35.9-65.4%), α-phellendrene (24.3-20.1%), myrcene (12.8-7.7%) and α-pinene (5.9-1.7%) for fruits and leaves, respectively. Both essential oils showed a dose-dependent allelopathic activity on wheat germination and radicle elongation with leaf oil being the more phytotoxic. © 2010 Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków. Source


Hosni K.,Ecole Superieure DAgriculture de Mograne | Chrif R.,Ecole Superieure DAgriculture de Mograne | Zahed N.,Ecole Superieure DAgriculture de Mograne | Abid I.,Ecole Superieure DAgriculture de Mograne | And 3 more authors.
Rivista Italiana delle Sostanze Grasse | Year: 2010

The fatty acid and phenolic constituents of the leaves, flowers and fruits of Tunisian Rosa canina L. (Rosaceae) was studied. both qualitative and quantitative differences between different parts were observed. The oil content was higher in fruits (1.6%) when compared to leaves (0.6%) and flowers (1.1%). Eleven fatty acids were identified and the unsaturated α-linolenic (24.4% -56.8%) and linoleic (14.6% - 28.6%) acids were reported as the major compounds. The highest total phenolic content was observed in flowers (105.7 MG GAE/G). Ellagicacid (5611.5 μG/G-8469.6 LIG/G) and quercetin (4196.9 μG/G - 5832.7 μG/G) were the major phenolic compounds in all organs. All organs from Rosa canina L. could be considered as a potential source of nutritional and functional components due to the occurrence of appreciable amounts of essential fatty acids (unolenic and linoleic acids) and phenolic compounds. Source


Zahed N.,Ecole Superieure DAgriculture de Mograne | Hosni K.,Ecole Superieure DAgriculture de Mograne | Brahim N.B.,Institute National Of Recherche Agronomique Of Tunis Inrat | Sebei H.,Ecole Superieure DAgriculture de Mograne
Journal of Food Biochemistry | Year: 2011

The essential oil of Schinus molle L. fruits, collected from four locations in Tunisia was obtained by hydrodistillation and analyzed by high resolution gas chromatography with flame ionization detection and gas chromatography coupled to mass spectrometry. The highest yield (4.13%) was obtained in plants from El Kef (northwestern Tunisia), while the lowest yield was observed in INRAT (northeastern Tunisia). Both qualitative and quantitative differences were observed between different oils. All oil samples were rich in monoterpene hydrocarbons and limonene and β-phellandrene (30.8-61.8%), α-phellandrene (21-41.1%), myrcene (8.4-12.8%) and α-pinene (1.9-6.5%) were the main constituents. PRACTICAL APPLICATIONS: The essential oils and extracts obtained from many plants have recently gained popularity and scientific interest because of their use in the food, drug and perfumery industries. In this study, Schinus molle L. fruits have been found to be a potential source of volatile components and some of there are of great economical importance. From a practical standpoint, the essential oils of S. molle fruits could have numerous applications in the food industry, cosmetics and aromatherapy because of their richness in limonene, which is characterized by its nice perfume and biological properties. © 2011 Wiley Periodicals, Inc. Source


Hosni K.,Institute Superieur des Etudes Preparatoires Biologie Geologie | Zahed N.,Ecole Superieure DAgriculture de Mograne | Chrif R.,Ecole Superieure DAgriculture de Mograne | Abid I.,Ecole Superieure DAgriculture de Mograne | And 4 more authors.
Food Chemistry | Year: 2010

The peel essential oils from four selected Tunisian Citrus species: sweet orange (Citrus sinensis Osbeck), mandarin (Citrus reticulata Blanco); sour orange (Citrus aurantium L.) and pummelo (Citrus grandis Osbeck), cultivated under the same pedoclimatic and cultural conditions have been analysed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS). The essential oils content ranged from 1.06% to 4.62% (w/w) in pummelo and mandarin, respectively. The qualitative and quantitative analysis led to the identification of 70 components in all oil samples. The analysed oils consist mainly in monoterpene hydrocarbons (97.59-99.3%), with limonene (92.52-97.3%) and β-pinene (1.37-1.82) being the major constituents. The remaining chemical classes were weakly represented (<1%). Both qualitative and quantitative differences between oil samples have been observed and numerous components have been proposed as marker compounds. Since the influence of different environmental factors has been eliminated, the observed chemical variability between the studied species and cultivars seems likely to results from the genetic variability. © 2010 Elsevier Ltd. Source

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