Search results for " AROMA"
showing 10 items of 370 documents
Application of an in vivo ptr-tof-ms approach to determine differences in wine aroma release among wines spiked with different types of oenological t…
2017
International audience
In vivo aroma release by APCI-MS and PTR-MS: impact of water content of exhaled air and evidence for competition between aroma compounds
2013
Livre ISBN-13 : 978-3-902811-91-2; International audience; Atmospheric pressure chemical ionization mass spectrometry (APCI-MS) or proton transfer reaction mass spectrometry (PTR-MS) has been in use frequently for in vivo aroma release studies. In APCI-MS, protonated water clusters formed from moisture in the expired air are used as reagent ions. Yet the influence of a change in relative water content in the ionization gas on the data collected have been rarely studied and conflicting results were obtained. In this context our first objective was to study the impact of water content of the expired air on the level of aroma release measured by APCI-MS and to compare with the results obtained…
Chemo-biological analysis applied to the olfaction field
2019
Human are surrounded by numerous molecules in the air from a limited number of olfactory receptors [1], and one odor is not caused by only one compound but by a mixture of molecules [2]. Two different perceptions exist, the first being the heterogeneous perception which is the distinction between the odor components of the mixture. The second perception is homogeneous and consists in a mixture of molecules resulting in a single odor which is not possible to distinguish between odor components of the mixture. There are two types of homogeneous perceptions:1-When one of the mixture components covers the other constituents and we can only smell the odor of one of the mixture components: it is …
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.
Rules and Mechanisms of Perceptual Interaction of Odor Mixtures : Application to Icewine aroma
2021
Icewine was used as an experimental object, and hundreds of wine- or food-related odor mixtures were designed and investigated for the first time based on the identification and analysis of icewine’ odorants. The aim of the thesis work was to explore the key odor elements that affected the perception of odor mixtures and the general laws behind olfactory perceptual interactions. The thesis manuscript contains seven chapters:The first review of the literature gives a brief introduction to the olfactory system and odor perception. Then, odorants’ mixture perception is highlighted through examples of interactions between odorants at the perceptual level. Research progress in perceptual interac…
Aromatyczny charakter zasad azotowych
2017
Zasady azotowe to związki o szczególnym znaczeniu biologicznym, stanowią podstawowy budulec DNA i RNA oraz mają wpływ na całą różnorodność organizmów żywych. Zasady te należą do grupy związków aromatycznych, czyli takich, w których główną rolę odgrywa delokalizacja elektronów typu n w obszarze pierścienia. Aromatyczny charakter zasad azotowych został przedstawiony w oparciu o właściwości geometryczne HOMA (z ang. Harmonic Oscillator Model of Aromaticity) i magnetyczne NICS (z ang. Nucleus Independent Chemical Shift). Celem badań tej grupy związków jest poznanie ich struktury elektronowej, która dostarcza wiele cennych informacji dotyczących ich właściwości chemicznych, fizycznych i biochemi…
Improving the Aromatic Profiles of Catarratto Wines: Impact of Metschnikowia pulcherrima and Glutathione-Rich Inactivated Yeasts
2023
Catarratto is one of the most widely cultivated grape varieties in Sicily. It is an indigenous non-aromatic white grape variety. Despite its widespread use in winemaking, knowledge of the aroma and chemical and microbiological properties of Catarratto wines is quite limited. The influence of Metschnikowia pulcherrima combined with Saccharomyces cerevisiae on the aromatic expression of Catarratto wines was investigated with and without the addition of glutathione-rich inactivated yeast. The substance is a natural specific inactivated yeast with a guaranteed glutathione level used to limit oxidative processes. The aromatic profiles of the final wines were determined through analysis of the vo…
Recent advances in the research on herbicidally active aminomethylelebisphosphonic acids.
1999
Influence of the mode of application of herbicidally active N-pyridylaminomethylenebi-sphosphonic acids on their uptake by plants was studied in some detail. The experimental evidence is given that accounts for a multiple mode of action of these herbicides.
Hydrophobic interactions between aroma compounds and beta-Lactoglobulin using NMR and a fluorescent probe
2010
International audience; beta-lactoglobulin (bLg) is known to interact with aroma compounds affecting their release, and hence, their perception. bLg, composed of two hydrophobic binding sites, was used as a simple model food protein to investigate binding mechanisms as a function of ligand nature. Indeed, binding of small ligands to bLg sites is often selective, although some ligands bind to both sites. Interactions between bLg and one ketone, beta-ionone, and one phenol, guaiacol were investigated by combining two techniques: 2D Nuclear Magnetic Resonance for binding site location, and fluorescence using the 6-propionyl-2-(N, N-dimethylamino)naphthalene (PRODAN) probe for surface hydrophob…
Molecular Basis for Endocrine Disruption by Pesticides Targeting Aromatase and Estrogen Receptor
2020
The intensive use of pesticides has led to their increasing presence in water, soil, and agricultural products. Mounting evidence indicates that some pesticides may be endocrine disrupting chemicals (EDCs), being therefore harmful for the human health and the environment. In this study, three pesticides, glyphosate, thiacloprid, and imidacloprid, were tested for their ability to interfere with estrogen biosynthesis and/or signaling, to evaluate their potential action as EDCs. Among the tested compounds, only glyphosate inhibited aromatase activity (up to 30%) via a non-competitive inhibition or a mixed inhibition mechanism depending on the concentration applied. Then, the ability of the thr…