Sh. Ne'mati; F. Sefidkon; M.R. Poorherave
Abstract
Thymus species are well known as medicinal plants because of having biological and pharmacological properties. Thymus daenensis is an endemic aromatic medicinal plant to Iran. Essential oil of Thymus daenensis is a rich source of thymol which gives high antimicrobial and antioxidant activity to this ...
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Thymus species are well known as medicinal plants because of having biological and pharmacological properties. Thymus daenensis is an endemic aromatic medicinal plant to Iran. Essential oil of Thymus daenensis is a rich source of thymol which gives high antimicrobial and antioxidant activity to this plant. In this research, the aerial parts of Thymus daenensis were collected at full flowering stage from Alborz Research Station in Karaj. For finding the effect of drying methods on essential oil yield and composition, the plant material were dried in four different conditions (oven 30°C, 40°C, 50°C and shade). After drying the samples, their essential oils were obtained by water distillation in three replications and were analyzed by GC and GC/MS. Oil yield and percentage of main components were statistically compared by Duncan's test in SAS software. Oil yields (w/w) of the oven-dried 30°C, 40°C, 50°C and shade-dried samples were 1.42%, 1.12%, 1.24% and 1.29%, respectively. Thymol (75.3%, 75.7%, 72.0% and 67.2%), allo-aromadendrene (5.7%, 5.2%, 5.4% and 3.9%), γ-terpinene (2.9%, 2.8%, 5.9% and 10.2%), p-cymene (4.2%, 4.1%, 5.1% and 5.5%) and carvacrol (2.2%, 4.1%, 1.6% and 2.4%) were identified as the main components in oven-dried 30°C, 40°C, 50°C and shade-dried samples, respectively. Statistical analysis showed a significant difference between oil yields of oven-dried 30°C sample with other samples. The highest percentage of thymol was obtained from oven-dried 30°C and 40°C that showed a significant difference with other drying methods.
T. Biniyaz; Z. Habibi; M. Yousefi
Abstract
Artemisia genus belongs to Astraceae family with 34 species in Iran which two species, A. melanolepis Boiss. and A. kermanensis Podl, are endemic. In Iran and China this plant is highly noteworthy in traditional medicine. The purpose of this study is to determine the chemical composition in essential ...
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Artemisia genus belongs to Astraceae family with 34 species in Iran which two species, A. melanolepis Boiss. and A. kermanensis Podl, are endemic. In Iran and China this plant is highly noteworthy in traditional medicine. The purpose of this study is to determine the chemical composition in essential oil of Artemisia turcomanica Gand. Leaves after different hours of distillation and also identify essential oil composition of Artemisia turcomanica Gand. stems after four hours distillation. The essential oils of Artemisia turcomanica Gand. leaves were extracted after one, two and three hours of distillation by Clevenger apparatus and were analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). Generally, thirty-nine volatile components were identified on the basis of mass spectra characteristics, retention indices and 13CNMR spectroscopy. Thirty compounds were identified after one hour distillation from which linalool (21%), 1,8-cineole (19%), camphor (17%) and cis-chrysanthenyl acetate (16%) were the major constituents. The results of GC-MS analysis of the essential oil after two hour distillation revealed the presence of twenty-five compounds from which the major constituents were cis-chrysanthenyl acetate (24%), bornyl acetate (15%), linalool (13%) and camphor (9.3%). After three hours, the analysis of the oil showed thirty compounds. The major constituents were cis-chrysanthenyl acetate (12%), selin-11-en-4-α-ol (8.7%), bornyl acetate (8%), cis-jasmone (4%) and camphor (3.6%). Eighteen compounds were identified in the volatiles from the stems of A. turcomanica which were rich in cis-chrysanthenyl acetate (29%), bornyl acetate (18%), camphor (9%) and 1,8-cineole (6.9%). The amount of oxygenated monoterpenes was the highest after one hour distillation (86.7%) which gradually decreased in the other two samples (72.7% and 38.2% respectively). In contrast, the content of sesquiterpenes and oxygenated sesquiterpenes increased in the last hour of distillation.
E. Fathi; F. Sefidkon; Gh. Bakhshi Khaniki; Z. Abravesh; M.H. Assareh
Volume 25, Issue 1 , May 2009, , Pages 64-74
Abstract
In this research, the fresh leaves of Eucalyptus largiflorens were collected in the middle of spring from Kashan in Isfahan province. After drying the plant materials in oven 30°C, 40°C, 50°C, sun and shade, their essential oils were obtained by hydro-distillation. In addition, the essential ...
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In this research, the fresh leaves of Eucalyptus largiflorens were collected in the middle of spring from Kashan in Isfahan province. After drying the plant materials in oven 30°C, 40°C, 50°C, sun and shade, their essential oils were obtained by hydro-distillation. In addition, the essential oil of shade-dried sample was obtained by two other distillation methods (water and steam distillation and direct steam distillation). The oils were analyzed by GC and GC/MS. Oil yields (w/w) of the oven-dried 30°C, 40°C, 50°C, sun-dried and shade-dried sample were 1.37%, 1.58%, 1.59%, 1.31% and 1.32% respectively. 1,8-cineole (25.0%, 26.2%, 40.6%, 29.7% and 24.6%), P-cymene (17.2%, 17.4%, 20.3%, 20.5% and 17.1%) and α-pinene (16.2%, 12.6%, 14.4%, 7.2% and 9.9%) were identified as the main components in oven-dried 30°C, 40°C, 50°C, sun-dried and shade-dried sample, respectively. On the other hand, the oil yields were 0.92% and 0.77% in water and steam distillation and direct steam distillation. In different drying methods the result showed the oil yield and 1,8-cineole percentage were higher in oven-dried 50°C sample and in different distillation the oil yield in hydro-distillation was higher and the highest percentage of 1,8-cineole was obtained by water and steam distillation.
