Study Of Essential Oil Composition Research Articles

Comparative Study of Essential Oil Composition, Anti-bacterial And Antioxidant Activities of the Aerial Parts of Thymus vulgaris Grown in Morocco and France

Thymus vulgaris commonly known as thyme is an aromatic medicinal plant belonging to the Lamiaceae family. Two thyme essential oils grown in Morocco and France were investigated in this work. We analyzed their chemical composition and evaluated their antioxidant and antimicrobial effect. The chemical composition of essential oils was determined by gas chromatography/mass spectrometry. They were evaluated for their antibacterial activity against five marine pathogenic strains isolated from fish species identified as: Vibrio anguillarum, Photobacterium damselae subsp damselae, Aeromonas salmonicida, Edwarsiella tarda and Lactococcus garvieae. Then, the minimum inhibitory and bactericidal concentration values were determined. Furthermore, the antioxidant activity of the two essential oils was assessed in vitro by DPPH and ABTS assays. Thyme grown in France exhibited the greatest antibacterial activity against the studied strains in comparison with thyme grown in Morocco. Moreover, it showed the highest scavenging activity against free radicals produced by DPPH and ABTS with a percentage of 68.41% and 99.10% respectively, while thyme (Morocco) scavenged ABTS with 74.85%. The chemical components of the two essential oils revealed by the gas chromatography-mass spectrometry showed that thyme from France was mainly composed by thymol (35.77%), ortho-cymene (17.23%) and γ-terpinene (8.05%), while thyme from Morocco had borneol (31.04%), α-terpineol (15.16%), and carvacrol (7.13%) as the major constituents. These results showed the potential of thyme essential oils to be used in the aquaculture sector as phytobiotics to substitute chemicals and antibiotics weakening fish quality besides threatening the health of fish consumers.

Study of essential oil composition of Pyrethrum pulchrum Ledeb.

Pyrethrum pulchrum an impressive flower growing on large-stoned screes at the snow line, usually on glacier moraines in the mountains of Central Asia and South Siberia. The purpose of this study was to determine the essential oil composition from the aerial part of Pyrethrum pulchrum growing in Mongolia. The essential oil was obtained by hydro distillation and it had yield determined 0.1%. The oil was analyzed by GC-MS techniques. Fifty-seven components were identified representing 99.98% of the total oil composition. The main compounds of essential oil were camphor (33.9%), linalool (21.1%), α-pinene (9.0%), (Z)-γ-Curcumyl 2-methylbutyrate (4.82%), pentylcurcumene (3.21%), camphene (2.85%), tricosane (2.78%), nerolidol (2.63%), α-selinene (1.8%) and β-penine (1.4%). To our best knowledge, no previous studies have been reported on the chemical composition of the essential oil of Pyrethrum pulchrum.
 Дэгжин шиваантиг (Pyrethrum pulchrum Ledeb.) ургамлын эфирийн тосны химийн найрлагын судалгаа
 Хураангуй: Дэгжин шиваантиг (Pyrethrum pulchrum Ledeb.) нь Төв Ази болон Өмнөд Сибирийн уулархаг бүс нутгийн хад асгатай өндөр уулын бүслүүрт тархан ургадаг цэцэгт ургамал юм. Бид Монгол оронд ургадаг Дэгжин шиваантиг ургамлын газрын дээд хэсгийн эфирийн тосны химийн найрлагыг тодорхойллоо. Эфирийн тосыг усны уураар нэрж гарган авахад гарц 0.1% байв. Хийн хроматограф-масс спектрометрийн аргаар эфирийн тосны найрлаганд нийт 57 нэгдэл тодорхойлогдсон ба камфор (33.9%), линалоол (21.1%), α-пенин (9.0%), (Z)-γ-куркумил-2-метилбутират (4.82%), пентилкуркумен (3.21%), камфен (2.85%), трикосан (2.78%), неролидол (2.63%), α-селин (1.8%) ба β-пенин (1.4%) зэрэг нэгдлүүд зонхилон агуулагдаж байв. Энэхүү судалгааны ажил нь Дэгжин шиваантиг ургамлын эфирийн тосны судалгааг анх удаа хийж, танилцуулж буйгаар онцлог юм.
 Түлхүүр үгс: Нийлмэл цэцэгтэн , Дэгжин шиваантиг, Марал цэцэг, эфирийн тос

Comparative study of essential oil composition of Buddleja asiatica and Buddleja davidii aerial parts

Comparative study of essential oil composition of Buddleja asiatica and Buddleja davidii aerial parts

Comparative study of essential oil composition of Buddleja asiatica and Buddleja davidii aerial parts

Aerial parts of the plants, Buddleja asiatica Lour. and Buddleja davidii Franchet. were studied with a focus on essential oil composition by using gas chromatography and gas chromatography-mass spectrometry techniques. A total of 15 and 17 components were identified representing 83.46% and 86.83% of the total oil of B. asiatica and B. davidii respectively. The major constituents in B. asiatica oil were n-tridecane (55.87%), 5-methylundecane (10.62%), n-dodecane (2.84%) and n-hexadecanol (2.76%), while B. davidii essential oil was found to contain n-dodecane (55.15%), 5-methylundecane (13.67%), iso-acorone (4.32%) and n-undecane (2.64%) as major components. Both the essential oils were found to contain hydrocarbons as major compounds. The major component detected in B. asiatica essential oil was found as minor component in B. davidii essential oil and vice versa. The plants can be further studied for their biological activities and to identify various chemotypes.

Chemical composition and antioxidant activities of essential oils and methanol extracts of three wild Lavandula L. species

A comparative study of essential oil composition, polyphenol content and antioxidant activities of Lavandula coronopifolia, Lavandula multifida and Lavandula stoechas subsp. stoechas were reported. Qualitative and quantitative variations in the composition of oils according to species were shown. Lavandula coronopifolia's oil was characterised by high proportions of trans-β-ocimene (26.9%), carvacrol (18.5%), β-bisabolene (13.1%) and myrcene (7.5%). The main components of L. multifida oil are carvacrol (65.1%) and β-bisabolene (24.7%). Lavandula stoechas oil is rich in fenchone (34.3%) and comphor (27.4%). The total phenolic and flavonoid contents also significantly varied among species. Lavandula coronopifolia exhibits the highest phenolic and flavonoid contents (31.3 mg GAE g−1 and 16.3 mg RE g−1, respectively), followed by L. multifida (30.8 mg GAE g−1 and 12.3 mg RE g−1). Methanolic extracts and essential oils displayed significant antioxidant activities. The level of antioxidant capacity varied according to extracts and species.

Comparative study of essential oil composition of leaves and rhizomes of Alpinia conchigera Griff. at different post- harvest drying periods

Essential oils from the leaves and rhizomes of Alpinia conchigera Griff. dried for different times (0 (fresh), 1, 2, 3 and 7 days of drying, respectively) were isolated using hydrodistillation. The chemical composition of oils was analyzed by using GC and GC-MS. The identified components constituted 95.06, 94.51, 94.64 and 91.60% of the leaf oil and 47.71, 64.19, 49.96, 94.47 and 91.56% of the rhizome oil of fresh, 1, 2, 3 and 7 days drying samples, respectively. Thirty four components were identified, among which 31 had not been detected previously. The major constituents in fresh, one, two and three days dried leaves were cyclohexene, 1-methyl-4-(5-methyl-1-methylene-4-hexenyl), while for leaves dried for seven days were 1, 6, 10-dodecatriene, 7 and 11-dimethyl-3-methylene. β-pinene was the major component for fresh and two days dried rhizomes, while 1-methyl-4-(5-methyl-1-methylene-4-hexenyl) was the major constituent for one, three and seven days dried rhizomes. The post-harvest drying period had a positive effect on the oil yield of both leaf and rhizome. The highest oil yield was obtained from leaves dried for 7 days (0.300 v/w) and rhizomes dried for 3 days (0.162 v/w). This study suggests that the yield and content ofessential oils from the leaves and rhizomes of A. conchigera could be increased by drying leaves and rhizomes for 3 and 7 days, respectively. Key words: Alpinia conchigera Griff., essential oil, GC-MS, post-harvest drying, Zingiberaceae.

Statistical Study of Essential Oil Composition in Three Cultivated Sage Species

The essential oil yield and composition of Salvia officinalis L., S. pomifera L. and two leaf variations of S. fruticosa Mill, cultivated in the same field, were determined by hydrodistillation and gas chromatography. In the analytical data statistical tests such as analysis of variance, correlation coefficient, chi-square test, t-test, and multiple correlation were applied. The results showed that there is a statistically significant difference between the species/variations for all the studied oil constituents. Also the difference is significant for some constituents between the two leaf variations of S. fruticosa. Many significant correlation coefficients and multiple correlation coefficients between the different constituents within each Salvia species were found. Some other correlations are found significant within S. pomifera only. The last ones could characterize the chemotype of this species probably.