Search results for "Nerol"

The Politics of Good and Evil

2005

Sex-pairing pheromones and reproductive isolation in three sympatric Cornitermes species (Isoptera, Termitidae, Syntermitinae)

2011

International audience; The species-specificity of pairing has been studied in three sympatric Neotropical termites: Cornitermes bequaerti, Cornitermes cumulans and Cornitermes silvestrii (Termitidae, Syntermitinae). Bioassays showed that sex attraction was highly species-specific between C. bequaerti and C cumulans but not between C. cumulans and C. silvestrii. The sex-pairing pheromone of the three species is secreted by the tergal glands of female alates. It consists of a common compound (3Z,6Z,8E)-dodeca-3,6,8-trien-1-ol. In C. bequaerti, this polyunsaturated alcohol is the only compound of the sex-pairing pheromone, whereas it is associated with the oxygenated sesquiterpene (E)-nerolid…

Determination of terpene alcohols in Sicilian Muscat wines by HS-SPME-GC-MS.

2013

Muscat is a grape family used to obtain several sweet, aromatic white dessert wines common in the Mediterranean area. Currently, three Sicilian cultivars (all classified DOC) are known: 'Moscato di Siracusa' the oldest and very rare today; 'Moscato di Noto', a modern derivative of the first and finally 'Moscato di Pantelleria', now the most common. This study concerns the volatile profile of 15 different Sicilian Muscat wines produced in different years using HS-SPME-GC-MS. In particular, four fundamental terpene alcohols (linalool, geraniol, nerol and citronellol) were considered. The principal aim was to study the evolution of aromatic compounds in wine during aging, and the information o…

Essential oil components of orange peels and antimicrobial activity

2016

In this study, the orange peel of 12 cultivars of Citrus sinensis from central-eastern Sicily was employed to obtain essential oils and extracts. The ones were extracted through steam distillation, the others through extraction in hexane. Chemical constituents were evaluated in terms of qualitative and quantitative analyses by gas chromatography/mass spectrometry. Fifty-four components were identified in the steam essential oils and 44 in the extracts. In all the cultivars, the main component is d-limonene (73.9–97%); discrete percentages of linalool, geraniol and nerol were also found. Cluster analysis based on essential oils composition showed a certain degree of affinity between cultivar…

Composition of essential oil of lemon thyme (Thymus × citriodorus) at different hydrodistillation times.

2018

Distillation time can both to optimise the production and to engineer the composition of essential oil in essential oil bearing plants. Purpose of this study was to evaluate the effect of duration of hydrodistillation on composition of essential oil of Thymus × citriodorus, the natural source of commercially important geraniol and citral, a component with valuable biological properties. Essential oils were isolated by hydrodistillation at different distillation times and analysed by GC/MS analytical methods. Increase in percentage of essential oil during all hydrodistillation time gradient was uneven. Elongation of hydrodistillation time decreased percentages of monoterpenes but increased p…

The Influence of Aroma Compounds on Senzorial Traits of Wines From the Apold Depression

2015

Abstract The present study aims at investigating aroma compounds in three wine varietals (Pinot gris, Traminer roz, Riesling) from Apold, the county of Sibiu, production of 2014, and their importance in realizing the sensorial profile of wines. Thus, it is ascertained that Traminer roz contains the highest amount of esters - 583.846 mg/L, a value that leads to the sensorial identification of floral and fruity notes. Higher alcohols determined through chromatography imprint specific traits to Pinot gris wines: bittersweet, floral notes validated through the determined amount (479.449 mg/L). Another wine trait is the concentration of higher fatty acids which reach an amount of 252.667 mg/L in…

Qualité aromatique de la framboise (Rubus idaeus L.) II. Interprétation de l'indice d'arôme

1982

International audience; La mesure de l'indice d'Arôme, basée sur l'intensité de la coloration bleue qui se développe dans les distillats de framboises aromatiques traités par la vanilline en solution sulfurique concentrée, est interprétée en identifiant les principaux composés participant à cette réaction colorée. Six composés : géraniol, linalol, nérol, α-terpinéol, α- et β-ionones, ont été séparés, révélés et inolés par chromatographie sur couche mince de gel de silice (CCM) et identifiés par couplage chromatographie en phase gazeuse (CPG) et spectrométrie de masse (SM). Ces composés représentent près de 80% de la valeur de l'Indice d'Arôme d'un distillat d'une variété aromatique : Mallin…

Oplopanone derivatives monoterpene glycosides from Artemisia sieberi

1993

Abstract The aerial parts of Artemisia sieberi yielded three new oplopanone derivatives, three new monoterpene glycosides, a new germacrane alcohol and a monoterpene acid related to nerolidol.

Oxygenated nerolidol esters and eudesmane acids fromInula viscosa

1991

Abstract The aerial parts of Inula viscosa yielded three new esters of 9-hydroxynerolidol and two new eudesmane acids, along with several known compounds.

The Roots of Terror

2020

Risk would serve as a fertile ground to move resources, otherwise would be stagnated, so that elite may centralize and solidify “extractive institutions” to enhance the economic performance. The war of all against all, predicated by Hobbes sets the pace to the war of few blocs to yield a supreme authority over the rest. The theory of globalization is reluctant to explain how the world tends to a centralization of resources and violence. Here we come across with a paradox, if the XXth century posed a lot of states making the war to forge their own identity (as it was the case in Europe and US who participated in two total wars), within the state a sentiment of nationhood persisted over other…