Search results for "rmn"
showing 10 items of 52 documents
Yield and Fruit Quality Characterization of Eight Old Sicilian Apple Cultivars
2011
In this trial, we examined the quality of eight old Sicilian apple cultivars (‘Cannamelo’, ‘Cardinale’, ‘Gelata Cola’, ‘Gelata’, ‘Granatino’, ‘San Giuseppe’, ‘Virticchiaro’, ‘Zitella’) and a commercial one (‘Annurca’ traditional clone) through bio-agronomic performances and chemical-physical analyses. We also analyzed flowering time, ripening time, pomological characteristics, and generated a specific descriptor list that indicates a great variability among the cultivars. The data obtained showed interesting characteristics in ‘Granatino’, ‘Virticchiaro’, and ‘Zitella’, such as total soluble solid, fruit size, peel cover color, yield efficiency, and crop load.
Relationships between sodium mobility, in-mouth salt and aroma release, and flavour perception : application to model cheeses
2012
The aim of this work is to understand the effects of changes in the composition of model cheeses on mobility, release and perception of flavor molecules (salt, aroma compounds). Six flavoured model cheeses were formulated (3 lipid/protein (L/P) ratios and 2 salt contents). The microstructure and the rheological properties of the model cheeses were characterized respectively by confocal microscopy and by uniaxial compression test. The mobility of sodium ions was analyzed by 23Na NMR. The kinetics of sodium release was followed in water and then in saliva during consumption of the model cheeses. The retronasal release of aroma compounds was followed by nose-space APCI-MS, simultaneously with …
Relationships between sodium mobility, in-mouth salt and aroma release, and flavour perception : application to model cheeses
2012
The aim of this work is to understand the effects of changes in the composition of model cheeses on mobility, release and perception of flavor molecules (salt, aroma compounds). Six flavoured model cheeses were formulated (3 lipid/protein (L/P) ratios and 2 salt contents). The microstructure and the rheological properties of the model cheeses were characterized respectively by confocal microscopy and by uniaxial compression test. The mobility of sodium ions was analyzed by 23Na NMR. The kinetics of sodium release was followed in water and then in saliva during consumption of the model cheeses. The retronasal release of aroma compounds was followed by nose-space APCI-MS, simultaneously with …
Identification of markers that can be recognised using spectroscopic sensors and which reflect key stages in the cooking of meat and fish
2016
One of the purposes of the Opticook project is to install spectroscopic sensors in ovens, so equipping them with non intrusive tools allowing following cooking process of meat and fish. The hypothesis on which sensors were developed was: are muscular proteins proper probes to discriminate among several cooking degrees? Thus, at the beginning of the project several tools were used to characterise effect of several cooking degrees on macroscopic properties (texture and colour) of beef, chicken and cod fillet samples. Following, calorimetry and spectroscopic techniques were used to study transformations at molecular scale. In particular, visible spectroscopy followed denaturation of haemprotei…
Influence of superplasticizers structure on the hydration, the initial surface creation and the fluidity of cement model systems
2014
Nowadays the use of superplasticizers admixtures becomes unavoidable for concrete. It allows enhancing the rheological properties at the fresh state: the initial flow and slump retention during the 2-3 first hours of the life of a concrete. The understanding of this mechanism is still partly elucidated for PCE (grafted copolymers). The aim of this thesis was to challenge the assumption of the evolution of the adsorbed amount of PCE per instantaneous mineral surface unit as origin of the fluidity temporal evolution during the workability period.On an inert system (calcite), we confirmed that the fluidity is mainly governed by the adsorption level. Thus for a same surface adsorption density, …
Impact on flavour release of the structure of composite gels containing polysaccharides: Example of the fruit préparations
2006
The main objective of this study was to understand the respective rôle of the structure of a food product and of the physicochemical interactions on flavour release. For that purpose, fruit préparations hâve been chosen as model matrices. Those matrices contain a polysaccharide as gelling agent, a cross-linked waxy corn starch (1.4%), a high sucrose content (35%), an acidic buffer and a strawberry aroma (17 molécules). Four matrices were developed by modifying either the composition or the concentration in gelling agent: two matrices of similar texture containing either LM pectin or carrageenan, and two carrageenan based matrices with différent gelled structures. In a first step; two comple…
Identificación de biomarcadores no invasivos de endometriosis mediante metabolómica por RMN
2015
La endometriosis es una enfermedad ginecológica crónica, estrógeno dependiente, asociada a dolor pélvico e infertilidad. Se define por la presencia de tejido endometrial fuera de la cavidad uterina y representa uno de los desórdenes ginecológicos benignos más comunes. Los síntomas de la endometriosis son altamente variables, inespecíficos y comunes en la población general, lo que contribuye a un retraso en el diagnóstico que oscila entre 8-12 años. Actualmente, el “patrón de oro” para el diagnóstico de la endometriosis es la cirugía, normalmente mediante laparoscopia. Sin embargo, se trata de un procedimiento invasivo, que implica riesgos potenciales y no es apropiado para el seguimiento pe…
Interactions entre la beta-lactoglobuline et les arômes : impact au niveau moléculaire
2008
Interactions between β-lactoglobulin (BLG) and aroma compounds were investigated by complementary techniques for a better knowledge of binding mechanisms between proteins and aroma compounds at a molecular scale. Two binding sites have been defined for the monomeric BLG, one internal site within the central calyx, and one external site between the calyx and the α helix. In a first step, a relation between the ligand structure and its binding behaviour was established from the study of impact of a wide range of aroma compounds on the structure of native BLG. We evidenced at least two binding behaviours as a function of the chemical class, the hydrophobicity, or the structure of the ligands. …
LA RMN NEL FOLLOW UP DELLA FUNZIONALITA’ GONADICA NELLE ADOLESCENTI CON S. DI TURNER
2012
Developement of new techniques of Optimal Control in Quantum Dynamics : from nuclear magnetic resonance to molecular physics
2011
The goal of this thesis is to apply the optimal control theory to the dynamics of quantum systems.The first part aim at introducing the tools of optimal control in quantum control which were initially developedin mathematics. This approch has been applied on different kinds of quantum system with small and largedimensions. The first part of this manuscript introduces the optimal control tools which are used with a pointof view suited to a public of physicists. In the second part these techniques are used to control the dynamics ofspins in NMR and MRI. The third part deals with the development of new iterative algorithms applied to thecontrol by laser fields of the rotational dynamics of lin…