Search results for "Essential"

Effects of air pollution on production of essential oil in Feijoa Sellowiana Berg. grown in the "Italian triangle of death"

2010

The composition of the essential oils of fruits from Feijoa sellowiana grown in the district of Acerra is compared with those collected from unpolluted sites. Essential oils from the fruits of F. sellowiana were analysed by GC/MS. Sixty compounds, representing 96.6% and 97.8% (unpolluted site and Acerra site, respectively) of the oils, were identified. The major constituents were β-caryophyllene (12.4% and 16.8%), ledene (9.6% and 11.1%), α-humulene (6.3% and 8.2%), β-elemene (4.9% and 5.3%) and δ-cadinene (4.7% and 5.2%) in the control site and Acerra site, respectively. The antioxidant components were increased in response to polluted condition. The acetonic extracts of F. sellowiana from…

Polymorphonuclear leukocyte integrin profile in essential hypertension

2000

Correspondence

1999

Biomolecular characterization of wild sicilian oregano: phytochemical screening of essential oils and extracts, and evaluation of their antioxidant a…

2013

An extensive survey of wild Sicilian oregano was made. A total of 57 samples were collected from various sites, followed by taxonomic characterization from an agronomic perspective. Based on morphological and production characteristics obtained from the 57 samples, cluster analysis was used to divide the samples into homogeneous groups, to identify the best biotypes. All samples were analyzed for their phytochemical content, applying a cascade-extraction protocol and hydrodistillation, to obtain the non volatile components and the essential oils, respectively. The extracts contained thirteen polyphenol derivatives, i.e., four flavanones, seven flavones, and two organic acids. Their qualitat…

Grapefruit essential oils inhibit quorum sensing of Pseudomonas aeruginosa.

2019

Citrus essential oils are used in food to confer flavor and aromas. The citrus essential oils have been granted as GRAS and could be used as antimicrobial additives to control bacterial quorum sensing from potential food bacterial pathogens. The chemical composition and inhibitory activity of Citrus paradisi (grapefruit) essential oils obtained by cold-pressed method (EOP) and cold-pressed method followed by steam distillation, against Pseudomonas aeruginosa were determined . The GC-MS analyses of the oil indicated the amount of the essential oil components was highest with D-limonene in both cases. However, the extraction method modified the chemical composition. EOP had higher amount of …

Effect of the lemon essential oils on the safety and sensory quality of salted sardines (Sardina pilchardus Walbaum 1792)

2017

The main aim of this research was to investigate the biopreservative effects of lemon essential oil (EO) micro-emulsions on salted sardines. The experimental design included two experimental trials, SR1 and SR2 carried out with 25 ml of lemon EO micro-emulsion at 0.3 and 1.0% (v/v), respectively, and a control trial performed without EO addition. Chemical analyses on salted sardines inoculated with the EOs clearly showed a substantial persistence of several volatile organic compounds (VOCs) belonging to groups of monoterpene hydrocarbons, oxygenated monoterpenes and sesquiterpene hydrocarbons derived from EOs during the entire period of ripening. In particular, the molecules mostly represen…

Use of Spectroscopic Techniques to Monitor Changes in Food Quality during Application of Natural Preservatives: A Review

2020

Publisher's version (útgefin grein)

¿Hay límites a la regresividad de derechos sociales?

2016

La constatación de modificaciones legislativas que afectan negativamente al objeto y alcance de derechos sociales y que dan lugar a retrocesos de los mismos plantea importantes cuestiones sobre sus condiciones de posibilidad. En este artículo se sostiene la tesis de acuerdo con la cual los retrocesos o la reversibilidad de los derechos sociales son decisiones normativas limitadas fundamentalmente por dos expedientes, garantías o salvaguardas. El primero es la posibilidad de determinar un contenido esencial para los derechos sociales. El segundo radica en situar el peso de la justificación de la decisión en la identificación de la legitimidad del fin de la norma. Ambos conducen, en el ámbito…

Phytochemical Studies on Ptilostemon greuteri Raimondo & Domina (Compositae)

2012

Ptilostemon greuteri Raimondo & Domina is described as a new species and its growth is limited to the area of the province of Trapani. Essential oils of aerial parts of P. greuteri were analized by gas chromatography-mass spectrometry (GC-MS). The analysis of acetonic extract of aerial parts led to identification of triterpenes components: α-amyrin, β-amyrin, α-amyrin acetate, β-amyrin acetate, lupeol, lupeol acetate and taraxasterol. CC and preparative TLC of acetonic extracts has yielded lignan lactone and a sesquiterpene lactone that have been isolated previously from other Ptilostemon species.

Chemical composition and antibacterial activity of essential oil of Pulicaria odora L.

2004

The chemical composition of the volatile oil constituent from Pulicaria odora L. roots has been analyzed by GC/MS. Twenty-seven components were identified, being thymol (47.83%) and its derivative isobutyrate (30.05%) the main constituents in the oil. Furthermore, the oil was tested against seven bacteria at different concentrations. Results showed that the oil exhibited a significant antibacterial activity.