Browsing by Author "Jaouadi, Wahbi"
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- Biological activities and oil properties of Origanum glandulosum Desf: a reviewPublication . Mechergui, Kaouther; Jaouadi, Wahbi; Coelho, Jose; Serra, Maria Celeste; Khouja, Mohamed Larbi ArbiOriganum glandulosum Desf. (Species endemic of North Africa: Tunisia and Algeria) is important medicinally as it has antimicrobial, antifungal, antioxidant, antibacterial, antithrombin, antimutagenic, angiogenic, antiparasetic and antihyperglycaemic activities. Phytochemical investigations of the species of this genus have resulted in the extraction of a number of important bioactive compounds. This emphasizes on the need of extensive study for reporting the additional information on the medicinal importance, the biological activities and properties of oil of other unattended species of Origanum glandulosum. © 2015 Springer-Verlag France.
- Chemical composition and antioxidante activity of Tunisian Origanum glandulosum Desf. essential oil and volatile oil obtain by supercritical CO2 extractionPublication . Mechergui, Kaouther; Jaouadi, Wahbi; Coelho, Jose; Serra, Maria Celeste; V Marques, A; Palavra, António M. F.; Khouja, Mohamed Larbi Arbi; BOUKHCHINA, SADOKDried flowers and leaves of Origanum glandulosum Desf. were submitted to hydrodistillation (HD) and supercritical fluid extraction with CO2 (SFE). The essential oils isolated by HD and volatile oils obtained by SFE were analysed by GC and GC/MS. Total phenolics content and antioxidant effectiveness were performed. The main components of the essential oils from Bargou and Nefza were: p-cymene (40.4% and 39%), thymol (38.7% and 34.4%) and γ- terpinene (12.3% and 19.2%), respectively. The major components obtain by SFE in the volatile oil, from Bargou and Nefza, were: p-cymene (32.3% and 36.2%), thymol (41% and 40%) and γ-terpinene (20.3% and 13.3%). Total phenolic content, expressed in gallic acid equivalent (GAE) g kg-1 dry weight, varied from 12 to 27 g kg-1 dw, and the ability to scavenge the DPPH radicals, expressed by IC50 ranged from 44 to143 mg L-1.
- Effect of harvest year on production, chemical composition and antioxidant activities of essential oil of oregano (Origanum vulgare subsp glandulosum (Desf.) Ietswaart) growing in North AfricaPublication . Mechergui, Mechergui; Jaouadi, Wahbi; Coelho, Jose; Khouja, Mohamed LarbiDried flowers and leaves of Origanum glandulosum (Desf.) Ietswaart collected at different harvesting years were submitted to hydrodistillation. The isolated essential oils were analyzed by GC and GC/MS to study the harvest year effect on oregano chemical composition. Total phenolic contents and antioxidant effectiveness were performed. Nefza essential oils were obtained in yields of 4.6%, 5.8% and 4.3% from plants collected in 2007, 2008 and 2009, respectively. The values of essential oil content of Krib population were close (2-2.7%). There are qualitative and quantitative differences in the chemical composition of essential oils of Krib and Nefza populations from one harvest year to another. p-cymene, -terpinene, thymol and carvacrol are the main compounds of all oils, regardless of the year of harvest. The year that has the highest value in rainfall and which declines in cooler conditions during the flowering period, has been the most important value in essential oil yield. Wide variations were noted in total phenolic content, expressed in gallic acid equivalent which varied in Nefza population, between 8.52–17.67 g GAE/kg dw. The anti-radical activity expressed by IC50 of oregano essential oils was varied from one year to another, from 59.2 mg/L in 2007, to 226.19 mg/L in 2008 for Nefza population. Those of Krib varied from 79.8 to 151.85 mg/L. The controlled culture of oregano is better that using the wild populations if we would like have stable constituents destined to the industries or pharmacological uses. So, we can adjust the controlled parameters of our culture according to our purpose.
- Effect of harvest year on production, chemical composition and antioxidant activities of essential oil of oregano (Origanum vulgare subsp glandulosum (Desf.) Ietswaart) growing in North AfricaPublication . Mechergui, Kaouther; Jaouadi, Wahbi; Coelho, Jose; Khouja, Mohamed LarbiDried flowers and leaves of Origanum glandulosum (Desf.) Ietswaart collected at different harvesting years were submitted to hydrodistillation. The isolated essential oils were analyzed by GC and GC/MS to study the harvest year effect on oregano chemical composition. Total phenolic contents and antioxidant effectiveness were performed. Nefza essential oils were obtained in yields of 4.6%, 5.8% and 4.3% from plants collected in 2007, 2008 and 2009, respectively. The values of essential oil content of Krib population were close (2-2.7%). There are qualitative and quantitative differences in the chemical composition of essential oils of Krib and Nefza populations from one harvest year to another. p-cymene, γ-terpinene, thymol and carvacrol are the main compounds of all oils, regardless of the year of harvest. The year that has the highest value in rainfall and which declines in cooler conditions during the flowering period, has been the most important value in essential oil yield. Wide variations were noted in total phenolic content, expressed in gallic acid equivalent which varied in Nefza population, between 8.52–17.67 g GAE/kg dw. The anti-radical activity expressed by IC50 of oregano essential oils was varied from one year to another, from 59.2 mg/L in 2007, to 226.19 mg/L in 2008 for Nefza population. Those of Krib varied from 79.8 to 151.85 mg/L. The controlled culture of oregano is better that using the wild populations if we would like have stable constituents destined to the industries or pharmacological uses. So, we can adjust the controlled parameters of our culture according to our purpose.