Chemical composition and antimicrobial activities of helichrysum amorginum cultivated in Greece

The chemical composition of the essential oil obtained from the aerial parts of the cultivated Helichrysum amorginum was investigated by GC and GC/MS. From the 29 identified constituents representing 85.0% of the total oil, spathulenol (36.6%) and β-pinene (12.5%) were the major components. Furthermore, it was found that the oil exhibited a moderate antimicrobial activity against four Gram-negative bacteria, two Gram-positive and three pathogenic fungi. © 2004, Taylor & Francis Group, LLC. All rights reserved

Chemical composition and in vitro antimicrobial activity of the essential oils of two Helichrysum species from Tanzania

The chemical composition of the essential oils obtained from the aerial parts of Helichrysum cymosum and H. fulgidum, from Tanzania, were analyzed by GC and GC/MS. A total of sixty-five compounds, representing 92.4% and 88.2% of the two oils, respectively, were identified, trans-Caryophyllene, caryophyllene oxide, β-pinene, p-cymene, spathulenol and β-bourbonene were found to be the main components. Furthermore, the oils were tested against six gram (±) bacteria and three pathogenic fungi. It was found that the oil of H. fulgidum exhibited significant antimicrobial activity, while the oil of H. cymosum was not active at all

Composition and antimicrobial activity of the essential oils of two Origanum species

The essential oils obtained from the aerial parts of Origanum scabrum and Origaum microphyllum, both endemic species in Greece, were analyzed by means of GC and GC-MS. Forty-eight constituents were identified, representing 98.59 and 98.66% of the oils, respectively. Carvacrol, terpinen-4-ol, linalool, sabinene, α-terpinene, and γ-terpinene were found as the major components. Furthermore, both samples exhibited a very interesting antimicrobial profile after they were tested against six Gram-negative and -positive bacteria and three pathogenic fungi

Composition and antimicrobial activity of the essential oil of Hypericum rumeliacum subsp. apollinis (Boiss. & Heldr.)

The composition and the antimicrobial activity of the aerial parts of Hypericum rumeliacum are reported. Analysis was carried out by GC/MS. The major constituents were α-pinene (43.80%), β-pinene (9.82%), dehydro-aromadendrene (6.81%) and α-copaene (5.41%). The essential oil showed a moderate in vitro activity against the six Gram negative and positive bacteria and a stronger one against the three-tested pathogenic activity. Copyright © 2003 John Wiley & Sons, Ltd

Composition and antimicrobial activity of the essential oil of Salvia ringens

The essential oils of Salvia ringens (samples A and B), were analyzed by means of GC and GC/MS. From the seventy-five identified constituents representing 99.82 and 99.86% of the oils, 1,8-cineole and α-pinene were the major components. Furthermore, sample B exhibited a very interesting antimicrobial profile after it was tested against six Gram (±) bacteria and three pathogenic fungi

Composition and antimicrobial activity of the essential oils of two Origanum species

The essential oils obtained from the aerial parts of Origanum scabrum and Origaum microphyllum, both endemic species in Greece, were analyzed by means of GC and GC-MS. Forty-eight constituents were identified, representing 98.59 and 98.66% of the oils, respectively. Carvacrol, terpinen-4-ol, linalool, sabinene, α-terpinene, and γ-terpinene were found as the major components. Furthermore, both samples exhibited a very interesting antimicrobial profile after they were tested against six Gram-negative and -positive bacteria and three pathogenic fungi

Cantleyoside-dimethyl-acetal and Other Iridoid Glucosides from Pterocephalus perennis - Antimicrobial Activities

Cantleyoside-dimethyl-acetal (6), was isolated from the endemic Greek plant Pterocephalus perennis subsp. perennis in addition to five other known iridoid glucosides, loganin, loganic acid, cantleyoside, secologanin, and secologanin-dimethyl-acetal. The structure of these compounds was determined by all spectroscopic means mainly by NMR and MS techniques. The above compounds as well as their acetyl derivatives were tested against six Gram positive and negative bacteria and three pathogenic fungi. © 2002, Verlag der Zeitschrift für Naturforschung. All rights reserved

Composition of fruit volatiles and annual changes in the volatiles of leaves of Eucalyptus camaldulensis Dehn. growing in Greece

The chemical components of the essential oils obtained from fruits of Eucalyptus camaldulensis and of those obtained from its leaves during the course of one year, were analysed by GC and GC-MS. From the identified 52 constituents of the fruit essential oil, representing the 62.0% of the total oil, spathulenol (19.0%), β-pinene (8.8%) and p-cymene (4.8%) were found as the main components, while the concentration of 1,8-cineole, the main leaf constituent, was relatively low (3.8%). The composition of the leaf essential oil varied qualitatively and quantitatively over the course of 1 year. Generally, from the identified 43 constituents representing the 74.7-94.2%, the main constituent was 1,8-cineole (25.3-44.2%). Although spathulenol was the second most abundant constituent (highest concentration 19.2%), there were months when its concentration was exceptionally low (0.5%). Copyright © 2003 John Wiley & Sons, Ltd