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The chemical composition of Frullania tamarisci essential oil from Corsica was investigated using GC-FID, GC-MS and NMR analyses. The essential oil compositions were further studied analyzing samples prepared from three different Corsican locations and during a seasonal vegetative cycle. 40 components, which accounted for 78.3-89.8% of the total amount of F. tamarisci essential oils were identified. The main components were tamariscol coeluted with pacifigorgiol (30.4-41.5%), germacra-1(10)E,5E-dien-11-ol (3.6-7.1%), γ-cylocostunolide (1.8-20.1%), γ-dihydrocyclocostunolide (1.2-8.0%) and frullanolide (1.7-4.9%). Among them, germacra-1(10)E,5E-dien-11-ol was never reported in the Frullania genus and pacifigorgiol, a tamariscol GC-overlapped compound, was for the first time reported in Bryophytes. Finally using 1D and 2D NMR experiments, we reported γ-dihydrocyclocostunolide as a new natural compound. Two Corsican F. tamarisci essential oils with different GC profiles were assessed for their phytotoxic behavior against onion seeds and seedling in order to evaluate their capacity to inhibit germination and alter the development of plantlets. According to the essential oil-compositions, a stimulation of the onion seedling was observed when sesquiterpene lactones amount was higher, whilst the inhibition of roots growth occurs when sesquiterpene alcohols were predominantly. [ABSTRACT FROM AUTHOR]

ABSTRACT The chemical compositions of Corsican and Sardinian Eryngium maritimum L. essential oils were investigated using column chromatography, gas chromatography with flame ionization detection and gas chromatography-mass spectrometry in electron impact mode. Sixty-three compounds were identified accounting for 85.8-95.7% of the total amount. With germacrene D (13.7-45.9%), three uncommon oxygenated sesquiterpenes, 4 βH-cadin-9-en-15-al (18.4-27.6%), 4 βH-cadin-9-en-15-ol (2.2-14.3%) and 4 βH-muurol-9-en-15-al (4.3-9.3%), were identified as main components of the essential oils obtained from the plant aerial parts. Relative to these, essential oils from the roots differed drastically with high contents of 2,4,5-trimethylbenzaldehyde (39.8%), 2,3,6-trimethylbenzaldehyde (29.0%) and α-muurolene (23.5%). The chemical variability of Corsican and Sardinian E. maritimum essential oils was studied using statistical analysis. A direct correlation between the island of origin of the sample essential oils and their chemical compositions was assessed. Corsican essential oils exhibited higher amounts of hydrocarbon terpenes than Sardinian samples. Relative to other Eryngium species, Corsican and Sardinian E. maritimum essential oils exhibited original compositions with sesquiterpene aldehydes. These compounds, together with total essential oil, were tested for antioxidant properties using the DPPH and ABTS radical-scavenging activity tests. No meaningful activity could be attributed to sesquiterpene aldehydes and the corresponding alcohols but the total essential oil and the oxygenated fraction of E. maritimum both demonstrated strong antioxidant properties. Copyright © 2013 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

ABSTRACT Volatile components of Teucrium marum from Corsica were investigated using a combination of analytical techniques. Analysis of essential oils obtained by hydrodistillation was performed using capillary GC-RI, GC-MS and 13C NMR spectroscopy after fractionation on column chromatography. The emitted volatile fractions from full aerial parts and separated organs of fresh T. marum were investigated using HS-SPME/GC-RI and HS-SPME/GC-MS. The intra-species variations of the chemical compositions of essential oils and volatile fractions from 25 Corsican sample locations were investigated using statistical analysis. The main essential oil components were caryophyllene oxide (0.4-20.5%), ( E)- β-caryophyllene (0.9-18.9%), ( E)- α-bergamotene (1.0-21.5%), (3 Z,6 E,10 E)- α-springene (1.1-17.8%), β-bisabolene (0.4-14.7%), β-sesquiphellandrene (0.9-10.9%) and estragole (0.5-7.0%), while dolichodial (20.0-83.4%), ( E)- α-bergamotene (0.2-20.6%), ( E)- β-caryophyllene (0.3-23.1%), dolicholactone (0.4-20.9%), β-bisabolene (0.2-10.0%), estragole (1.1-10.5%) and β-sesquiphellandrene (0.2-8.3%) were the main volatiles emitted by the plant. The 13C-NMR data of (3 Z,6 E,10 E)- α-springene and its occurrence in T. marum essential oils are reported for the first time. The importance of the sample preparation step is discussed through the absence/occurrence of dolichodial in both liquid and gaseous matrices studied, respectively. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

ABSTRACT The chemical composition of Xanthium italicum Moretti essential oil was established for the first time using gas chromatography and gas chromatography-mass spectrometry. One hundred and seven compounds were identified and accounted for 98.7% of the total amount. The main compounds were limonene (35.3%), borneol (5.6%), sabinene (5.8%), germacrene-D (2.5%), α-bisabolol (2.4%) and α-humulene (2.1%). Twenty-five oil samples were investigated, and their chemical variability was analysed statistically. Two main groups of essential oils were identified in concordance with the morphological characteristics: hydrocarbon-rich oils, which correlated with 100-120 cm plant height and oxygenated-rich oils, which correlated with 5-20 cm plant height. The chemical composition of the oils obtained from separated organs and the concentrations of the main compounds throughout the vegetative cycle of the plant were studied. Stem and leaf oils were characterized by the occurrence of limonene (47.9% g and 22.9%, respectively) and germacrene-D (4.6% and 15.8%, respectively). Flower oils displayed δ-selinene and germacrene-D as the main components (22.4% and 17.0%, respectively). X. italicum fruits yielded oil with a high amount of oxygenated compounds (72.9%), particularly sesquiterpene compounds (61.5%) such as α-bisabolol (43.0%), α-cadinol (5.0%) and ( E, E)- α-farnesol (4.3%). The amount of hydrocarbon compounds remained stable throughout the vegetative cycle, whereas the amounts of oxygenated compounds increased during fructification. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Volatile components extracted from the aerial parts and separated organs of Corsican and Sardinian Teucrium massiliense have been studied. The chemical composition of essential oils obtained by hydrodistillation (HD) has been investigated using GC-RI, GC-MS (EI and CI modes) and 13CNMR spectroscopy. For the first time, a real concentration via calibration curves and response factor calculations has been determined for each oil component. The concentrations of the major components were 6-methyl-3-heptyl acetate (23.83-18.16 g/100 g), 3-octyl acetate (10.55-6.95 g/100 g), isobutyl isovalerate (7.67-2.91 g/100 g), germacrene D (6.13-1.01 g/100 g) and linalool (6.63-5.23 g/100 g). To the best of our knowledge, the occurrence of 6-methyl-3-heptyl acetate as a natural product is reported for the first time. Furthermore, the chemical composition of volatile fractions emitted from the aerial parts and separated organs of T. massiliense L. has been studied by HS-SPME/GC-RI and GC-MS after optimization of SPME parameters. Concerning the contribution of plant organs to the aromatic plant fingerprint, we noted that the flowers produced more volatiles than other organs. The volatile fractions obtained from the different organs were qualitatively quite similar to each other but differed in the percentages of their major components. Also, the influence of HS-SPME extraction parameters (equilibrium and extraction times and temperature) on the chemical composition of the plant volatile fraction is discussed. Copyright © 2010 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

The essential oil of Doronicum corsicum L. (Asteraceae), an endemic species from Corsica, has been studied by GC, GC-MS(EI and CI), 1H- and 13C-NMR; 129 components were identified, representing 80.4% of the total amount. The essential oil was dominated by sesquiterpene hydrocarbons (38.2%) and oxygenated monoterpenes (36.7%). The major components were modhephene (11.6%), ( E)- β-caryophyllene (9.8%), 10-isobutyryloxy-8,9-epoxythymyl angelate (9.9%) and thymyl angelate (8.7%). The structures of the two thymol derivatives, the 13C-NMR data of four other thymol derivatives and the chemical composition of the essential oil of D. corsicum were reported for the first time. Copyright © 2007 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

The chemical composition of Otanthus maritimus L. essential oils obtained from aerial parts, roots and whole plants from Corsica was investigated by capillary GC and GC-MS analysis. A collective oil and some of its main components were tested for antibacterial activity against microorganisms involved in nosocomial infection and food-borne illnesses. With the exception of camphor (7.0-20.4%), the main constituents were irregular monoterpenes: yomogi alcohol (24.4-34.7%), artemisia alcohol (11.5-19.2%) and artemisyl acetate (4.9-12.6%). The antibacterial activity of O. maritimus oil and the antibacterial potential of both artemisia and yomogi alcohols against Staphylococcus aureus and Campylobacter jejuni are reported for the first time. Copyright © 2007 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

The root oil of Fokienia hodginsii from Vietnam was submitted, after fractionation over silica gel, to a combined analysis by GC-RI, GC-MS and 13C-NMR. Forty hydrocarbons and 19 oxygenated compounds, mostly sesquiterpenes, were identified. ( E)-Nerolidol and fokienol were the major components. Copyright © 2005 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

The composition of the essential oil of Teucrium polium subsp. capitatum from Corsica was investigated using a combination of GC-RI, GC-MS (EI and CI) and 13C-NMR spectroscopy after fractionation by column chromatography. The 86 identified compounds accounted for 93% of the total amount of the oil. The main components were α-pinene (28.8%), β-pinene (7.2%) and p-cymene (7.0%). Copyright © 2005 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

The essential oil of Inula graveolens was investigated by GC, GC-MS and 13C-NMR spectroscopy. First, a commercial sample was repeatedly chromatographed and analysis of the fractions led to the identification of 89 components. The main constituents were bornyl acetate (56.8%), borneol (7.6%) and τ-cadinol (7.8%). In the second part, six samples of I. graveolens essential oil, obtained at different stages of development of the plant, were investigated. Bornyl acetate and borneol were always the two major compounds. Then, in order to study the chemical variability, we analysed 22 samples obtained from several plants collected in a restricted area in different localities during the flowering stage. Bornyl acetate (43.1-73.1%) and borneol (3.7-32.2%) were the main compounds for 20 samples. Sample 21 exhibited borneol (41.9%) and bornyl acetate (16.6%) as the major components, while the composition of sample 22 was atypical (borneol 41.9% and τ-cadinol 23.8%). Copyright © 2004 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Four essential oils obtained from the aerial parts of Baeckea frutescens harvested in three provinces of Vietnam were analysed using GC, GC-MS and NMR spectroscopy. Forty-seven components, which represented 90-97% of the global composition, were identified. Two samples were characterized by the pre-eminence of tasmanone, a non-terpenic triketone, which accounted for 22.9% and 24.3%, respectively, of the chemical com-position and which was fully characterized using two-dimensional NMR spectroscopy. The two remaining samples were respectively characterized by high contents of p-cymene, α-thujene and 1,8-cineole for one sample and β-pinene, 1,8-cineole and α-pinene for the second sample. From these results and the literature data, it appears that B. frutescens essential oil exhibits high chemical variability. Copyright © 2004 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]