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Touil A.,Institute Superieur Des Etudes Technologiques Of Zaghouan | Chemkhi S.,Center Recherches Et Technologies Of Lenergie | Zagrouba F.,Institute Superieur Des Science Et Technologies Of Lenvironnement
International Journal of Food Engineering | Year: 2010

The effect of the drying rates of fruit and cladode of Opuntia Ficus Indica was examined at different temperatures. The experimental drying curves show only a falling drying rate period. The values of drying rate of prickly pear (fruit and cladode) almost doubled when the drying temperature was increased from 40 to 60°C. The experimental drying data were applied to various drying equation (Logarithmic; Wang and Singh, Henderson and Pabis, MMF model and Midilli equation). Midilli equation was optimal for characterizing drying behaviour of prickly pear for the whole range of temperature with a correlation coefficient of 99.99% for the fruit and the cladode and a standard error of 0.0015 for the fruit and 0.0017 for the cladode. Copyright © 2010 The Berkeley Electronic Press. All rights reserved. Source


Ben Hadj Ahmed S.,Gafsa University | Sghaier R.M.,U.S. National Institutes of Health | Guesmi F.,Gafsa University | Guesmi F.,Institute National Of Science Appliquees Et Of Technology Insat | And 5 more authors.
Natural Product Research | Year: 2011

In this study, we tested 10 essential oils (EOs) extracted from 10 plants issued from Sned region (Tunisia) to evaluate both their leishmanicidal effects against Leishmania major and L. infantum, and their cytotoxicity against murine macrophage cell line RAW 264.7 (ATCC, TIB-71). The antioxidant activity was also monitored by the DDPH method, while the chemical composition of active EO was assessed by GC-MS analysis. The results showed that the EOs obtained from Thymus hirtus sp. algeriensis (rich on monoterpenoids, especially linalool at 17.62% and camphor at 13.82%) is significantly active against both L. major and L. infantum, whereas Ruta chalepensis EO (rich on 2-undecanone at 84.28%) is only active against L. infantum. Both oil extracts showed low cytotoxicity towards murine macrophages. The characteristic ratios (IC 80 Raw264.7 cells/IC 50 L. infantum and IC 80 Raw264.7 cells/IC 50 L. major) were, respectively, 2.7 and 1.57 for T. hirtus sp. algeriensis, and 1.34 and 0.19 for R. chalepensis. However, when measuring the antioxidant effects (DDPH method), the two latter EOs presented a moderate 2,2-diphenyl-2-picrylhydrazyl hydrate scavenging effects compared to EOs from Eucaliptus globulus, Pinus halepensis, Pituranthos tortuosus, Rosmarinus officinalis, Tetraclinis articulata or to BHT. © 2011 Taylor & Francis. Source


Mejri J.,CNRS Institute of Chemistry | Abderrabba M.,CNRS Institute of Chemistry | Mejri M.,Institute Superieur Des Etudes Technologiques Of Zaghouan | Mejri M.,CNRS Institute of Chemistry
Industrial Crops and Products | Year: 2010

The essential oils of the dried aerial parts of Ruta chalepensis collected from the north of Tunisia were recovered by hydro-distillation with approximately 5.51% yield on a dry weight basis. The effects of drying and hydro-distillation duration on the chemical composition of the essential oils were studied. The obtained essential oils of the different parts of the herb were analyzed by GC-MS and 13 major compounds were identified. The main ones are 2-undecanone (77.18%), 2-decanone (8.96%) and 2-dodecanone (2.37%). 2-Undecanone was shown to be the unique component (100%) of the essential oil obtained from R. chalepensis flowers. Pulegone was identified only in the essential oil of the stems (about 32.11%) and camphor was identified exclusively in the essential oil of leaves (2.46%).The identification of the components of R. chalepensis essential oil should contribute to the understanding of the pharmacological activities of the herb. © 2010 Elsevier B.V. Source


Mejri J.,CNRS Institute of Chemistry | Abderrabba M.,CNRS Institute of Chemistry | Mejri M.,Institute Superieur Des Etudes Technologiques Of Zaghouan
Journal of Essential Oil-Bearing Plants | Year: 2012

To evaluate the effects of hydrodistillation parameters and the vegetative cycle of the plant (Ruta chalepensis L.) on the global essential oil yield the response surface methodology was used. The parameters tested are the volume of water in the suspension to be distilled and the time of distillation. The third parameter is the vegetative cycle of the plant. The responses were the global extraction yield and the extraction yield of following essential oil compounds: 2-undecanone, 2-decanone, 2-dodecanone and 2- tridecanone. The optimal conditions selected for the total output of the extraction obtained from the analysis of the response surfaces are: time of distillation: 120 minutes; volume of water in the suspension to be distilled: 500 ml; stage of vegetation: January (young growths). The results show that the time of distillation and the stage of vegetation are the parameters more meaning on the global essential oil yield. © 2012, Har Krishan Bhalla & Sons. Source


Touil A.,Institute Superieur Des Etudes Technologiques Of Zaghouan | Chemkhi S.,Center Recherches Et Technologies Of Lenergie | Zagrouba F.,Institute Superieur Des Science Et Technologies Of Lenvironnement
International Journal of Food Engineering | Year: 2010

The chemical composition (moisture, Brix, protein, acidity, saccharose, fructose, glucose and minerals), the physical properties (Linear dimensions, mass, density, shrinkage and porosity) and equilibrium properties (sorption isotherms, enthalpy and entropy) of Opuntia dillenii fruit were determined. This fruit is characterized by an important value of water content, minerals and acidity. It has also a considerable porosity. Concerning the sorption isotherms, G.A.B. model is the best to examine the phenomenon of fixation and liberation of water molecules. © 2010 Berkeley Electronic Press. All rights reserved. Source

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