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Cinétique d'acquisition du terroir Marennes-Oléron par l'huître creuse Crassostrea gigas : approche par les isotopes stables ArchiMer
Malet, Nathalie; Sauriau, Pierre-guy; Haure, Joel.
Japanese oysters previously reared in controlled conditions were replaced into the Marennes Oléron Bay on intertidal oyster parks during 2002 summertime. Kinetics of carbon and nitrogen isotope ratios was followed in 5 organs (digestive gland, gills, mantle, muscle and gonads). Results confirmed excepted significant differences in isotopie signatures between organs and revealed differences in the time required reaching equilibrium with the isotopie signatures of local food sources.
Tipo: Text Palavras-chave: Cinétique; Isotopes stables; Bassin de Marennes Oléron; Crassostrea gigas.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-6526.pdf
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Optimisation de procédés innovants pour l'obtention de phycocolloïdes ArchiMer
Vauchel, Peggy.
Alginates are polysaccharides which are naturally present in the cell wall of brown algae and extracted because of their rheological properties. The alginate industry uses an extraction protocol, which central step, the carbonatation, is conducted in batch reactors. It is a high water, reagent and time demanding process. The main objective of this thesis is to optimize the alginate extraction process. A study of the existing process, focused on carbonatation step, enabled to highlight points which could be enhanced to optimize the extraction yield and the quality of extracted alginates. Stirring intensity and algae pieces size have been identified as parameters having an influence on the carbonatation reaction kinetics. A specific analysis on medullar and...
Tipo: Text Palavras-chave: Alginate; Extraction; Laminaria digitata; Extrusion réactive; Optimisation; Modélisation; Distribution des temps de séjour; Cinétique; Rendement; Propriétés rhéologiques; Alginate; Extraction; Laminaria digitata; Reactive extrusion; Optimization; Modeling; Residence time distribution; Kinetics; Extraction yield; Rheological properties.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00002/11364/7937.pdf
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Purification de la chitine par hydrolyse enzymatique à partir de coproduits de crevette Penaeus vannamei. Caractérisations des produits et optimisation du procédé ArchiMer
Le Roux, Karine.
The objective of this study was to optimize the extraction of chitin by acid proteolysis. The novelty of the method is based on the stabilization of pH by the balance between substrate composition and the acid solvent. This principle allows a simultaneous demineralization and deproteinization, the two main reactions associated with the purification of chitin. To evaluate the performance of this purification, the composition of the substrate and products was characterized. Different methods of quantification of chitin and proteins have been compared. As traditional assays were not satisfaying, a direct method of amino acids determination by gaz chromatography was selected to estimate the amount of protein. The estimate of chitin amount was based on indirect...
Tipo: Text Palavras-chave: Coproduits de crustacés; Hydrolyse enzymatique; Protéolyse; Chitine; Extraction; Cinétique; Déminéralisation; Déprotéinisation; Crustacean by-products; Enzymatic hydrolysis; Proteolysis; Chitin; Extraction; Kinetic; Demineralization; Deproteinization.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00087/19828/17470.pdf
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