Search results for "GC"
showing 10 items of 606 documents
Le climat de la Terre à l’échelle des temps géologiques.
2011
2 pages; National audience
Mesure des émissions de CO2 en milieu urbain : étude du flux et de ses variations à l’aide des isotopes du carbone.
2013
7 pages; International audience; Dans la ville de Dijon, les émissions de CO2 ont été mesurées. Les variations de la concentration atmosphériquesen CO2 et de la signature isotopiques du CO2 atmosphérique ont permis de mettre en évidence un dôme urbain au dessus dela ville. Ce dôme présente un double mécanisme lié au trafic et à la respiration du sol. Le niveau de base des dômes sesitue sur une droite de mélange (ou une courbe) ayant pour origine les valeurs de la concentration (370 ppm) et du d13C (-8‰) mesurées en zone rurale ainsi que la droite de mélange du trafic. La concentration et la signature isotopique dépendaussi de la respiration du sol. D’autre paramètre comme la température et …
The relationship between copper accumulated in vineyard calcareous soils and soil organic matter and iron
2002
International audience; The intensive use for over 100 yr of copper sulfate (Bordeaux mixt.) to fight mildew in vineyards has led to a substantial accumulation of copper (Cu) in surface soils. To assess the effects of such large concns., the surface soils of 10 Burgundy vineyards were sampled and analyzed for total org. matter (carbon and nitrogen) and metal (copper and iron) contents. Phys. (i.e. size fractionation) and chem. (sequential extn.) methods were used to det. the distribution of these elements. The most Cu-contaminated plots showed the largest accumulation of org. carbon and Cu in the coarse sand and fine sand fractions. Copper was strongly correlated with org. carbon and org. …
Le cycle du carbone à l’échelle des temps géologiques.
2011
2 pages; National audience
U-Pb age constraints on Carboniferous-Permian French continental basins - implications for their depositional history and correlations with European …
2022
International audience; Late Carboniferous to Permian basins of western Europe (~Gzhelian to Artinskian), developed during thelate stages of the Variscan orogeny in equatorial paleolatitudes. The stratigraphic context of most of thesebasins remains poorly constrained, because mainly based on “continental stages” (e.g., Stephanian, Autunian,Saxonian and Thuringian) that are diachronous. Therefore, correlating these basins together and withinternationally recognized stratigraphic marine stages requires precise radiochronologic ages.To the south of the Paris Basin (France), volcanic ash-fall layers (i.e., tonsteins) are interbedded in theCarboniferous-Permian sedimentary successions of the Aum…
Characterization of the aromatic potential of grape berry
2022
IntroductionProbe is a research infrastructure gathering 4 analytical platforms of INRAE and allowing multi-approach and multi-complementarity to be explored and exploited. As a proof of concept, a common study was conducted around the structure and the evolution of the skin of the grape berry and the diffusion of compounds of interest during the winemaking process.Materials and methodsIn this context, the aromatic potential on two Vitis vinifera grape varieties (Carignan and Grenache,) were studied. Berries were harvested at an average potential alcohol of 12% vol. in the vineyard of the Pech Rouge experimental unit (INRAE, Gruissan, France) and separated according to their natural heterog…
Characterization of key aroma compounds in vegetable proteins foods
2021
International audience; The flavour profile of vegetable proteins food is complex due to the presence of a large number of compounds belonging to different chemical classes. The manufacturing process use many parameters of which temperature plays a role in the generation of volatile compounds.The flavour profile of two vegetable proteins sample (high and low thermal processing) were studied. GC-MS analyses detected and identified 71 aroma compounds (pyrazines, alcohols, ketones, aldehydes) in the two samples. Quantification showed a difference between the two thermal treatments. GC-O analysis described 70 olfactive areas, 39 of which attributed to a chemical compound.
Does aroma composition allow to discriminate groups of dark chocolates categorized on the basis of their organoleptic properties? Inputs of direct-in…
2017
International audience
Organoleptic properties of dark chocolates investigated by direct-injection mass spectrometry (PTR-ToF-MS) and GC-MS-Olfactometry
2017
Chapter 68 - Identification of Key Gin Aroma Compounds: An Integrative Approach Based on an Original Selection Procedure
2014
International audience; Potential impact aroma compounds of gin have been identified using Gas Chromatogry Olfactometry Mass-Spectrometry (GC-O-MS). In order to select some of them for a recombination study, we developed a specific procedure. Instead of only choosing the compounds on criteria such as their odor quality or their odor activity values, we also used physico-chemical parameters and information on their botanical origin. Data were organized in blocks homogeneous in terms of parameter type. Different statistical treatments were used in order to classify the compounds either by analyzing the parameters altogether or separately block by block.