1,721,139 research outputs found
Seasonal variation of the chemical consituents of the essential oil of Santolina etrusca from Italy
No full textThe seasonal variation of the essential oil, in terms of both yield and composition, of a population of Santolina etrusca (Asteraceae) is reported in detail for different aerial parts, including sterile branches, fertile branches, and capitula. The yields generally increased from November to June, and then decreased in August and September. The main constituents of the sterile branches were 1,8-cineole and viridiflorol. The oil from fertile branches was characterized by myrcene as principal compound, whereas the essential oil obtained from the capitula contained germacrene D as the main constituent. Several compounds, identified by GC and GC/MS, were found to prevail during the cold seaso
Odour gradients and patterns in volatile emission of different plant parts and developing fruits of grapefruit (Citrus paradisi L.)
No full textThe volatiles spontaneously emitted in vivo by different plant parts of grapefruit (Citrus paradisi Macf., Rutaceae) were collected by solid phase micro-extraction (SPME) during the whole vegetative cycle of the plant and characterised by GC–MS to verify their involvement in entomophilous pollination, a controversial topic in the biology of this species. Furthermore, the essential oils obtained by expression of
the pericarp from unripe and ripe fruits were studied. Altogether 127 compounds were identified, accounting from 82.1% to 99.9% of the whole volatiles. The main constituents detected were mono and sesquiterpenes, with limonene (0.5–95.2%), linalool (0.2–52.5%), sabinene (0.5–42.5%), myrcene
(0.2–15.4%), and b-caryophyllene (0.3–41.0%) as the most represented ones.
All the data were submitted to multivariate statistical analysis, highlighting many differences amongst the different plant parts and their developmental stage
Acaricidal agents of natural origin against Psoroptes cuniculi
No full textAbstract: Lavandula angustifolia Miller essential oil and some of its main constituents, i.e. linalool, linalyl acetate, and camphor were tested in vitro for their bioactivities against Psoroptes cuniculi (Delafond, 1859), mite of the rabbit. The essential oil and linalool were found to have very powerful miticidal activities
Activity of plant extracts, essential oils and pure compounds against fungi contaminating foodstuffs and causing infections in human beings and animals: a six-year experience (1995-2000)
No full textThe antifungal activity of plant extracts, essential oils and pure natural compounds has been evaluated against some fungal strains belonging to Aspergillus, Pyricularia, Fusarium, Botrytis, Candida, Saprolegnia and Microsporum genera. These fungi contaminate food-stuffs and cause infections in men and animals. Most of the tested plants belong to Lamiaceae and Asteraceae familie
Composition of the essential oils from leafy parts of the shoots, flowers and fruits of Eryngium amethystinum from Amiata Mount (Tuscany, Italy)
No full textThe essential oils obtained from the leafy parts of the shoots, inflorescences and fruits of Eryngiumnext amethystinum (Apiaceae) from Italy have been studied. The essential oil from the inflorescences was characterised by methyl-derivatives of benzaldehyde (26.4%) and by some phenylpropanoids (3.0%) such as eugenol and (E)-methyl isoeugenol. The essential oil of leafy parts of the shoots showed a higher percentage of sesquiterpenes (31.3%) than monoterpenes (20.2%). The main differences between the two essential oils can be referred to α-pinene and germacrene D: the essential oil of the inflorescences contained much more α-pinene than the other one (25.6% vs. 11.8%), while the contrary is true for germacrene D (14.5% vs. 31.3%
Analysis of the essential oil of the aerial parts of Viola etrusca from Monte Labbro (South Tuscany, Italy) and in vivo analysis of flower volatiles using SPME
No full textThe composition of the essential oil of the endemic Viola etrusca Erben from Monte Labbro (Italy) has been studied for the first time. It was made up almost exclusively of methyl salicylate (96%), together with many other mono- and sesquiterpenes and non-terpenic alcohols and aldehydes. In addition, the SPME technique has been used to evaluate the volatiles emitted in vivo by different-coloured flower
Variability of the essential oil of Viola etrusca
No full textEssential oils obtained from different populations of Viola etrusca from Italy have been analysed to verify the phenotypic discontinuity observed in a previous study. All of the essential oils contained methyl salicylate as a main constituent. However, multivariate analysis showed differences among some populations, in particular between northern and southern ones. Results suggest that this species could be undergoing a slow schizogenetic differentiation process due to its genetic isolatio
Use of solid-phase micro-extraction as a sampling technique in the determination of volatiles emitted by flowers, isolated flower parts and pollen
No full textThe volatiles emitted by fresh whole flowers or isolated flower parts of mandarin, Citrus deliciosa Ten. (Rutaceae), were sampled using solid-phase micro-extraction (SPME). This technique offers several advantages over dynamic headspace sampling techniques used in previous investigations. In particular, SPME requires smaller sample sizes and very short sampling times, which can minimize the formation of artifacts due to damage to the plant, and contaminations or loss of compounds. This was especially applicable to the collection of volatiles from polle
Considerations geobotaniques et phytochimiques au sujet de Hydrocotyle vulgaris L., H. ranunculoides L. et Centella asiatica (L.)Urban.
No full textAnalysis of the essential oil of the leaves and flawers/fruits of Eupatorium cannabinum L. from South Tuscany (Central Italy)
No full textThe essential oils obtained from leaves and flowers/fruits of Eupatorium cannabinum collected on Amiata Mount (South Tuscany, Italy) were studied by GC and GC/MS. Eighty-three constituents were identified in both oils, the major oxygenated components being methyl thymol (7.8% and 12.2%, respectively) and spathulenol (7.3% and 10.8%, respectively) in the leaf and flower/fruit oils, respectively
- …
