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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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Optimization study of fructans extraction from Agave tequilana Weber azul variety Ciênc. Tecnol. Aliment.
SALAZAR-LEYVA,Jesús Aarón; OSUNA-RUIZ,Idalia; RODRÍGUEZ-TIRADO,Víctor Alfonso; ZAZUETA-PATRÓN,Iris Eréndira; BRITO-ROJAS,Héctor Daniel.
Abstract Agave tequilana Weber azul variety is a valuable source of fructans. In this study, a response surface methodology was employed to optimize the extraction yield of fructans from agave pines. A Box Behnken factorial design was applied to evaluate the effects of several conditions such as extraction temperature, water raw material ratio and extraction time on extraction yield. Under the optimum extraction conditions (extraction temperature of 79.1 °C, water raw material ratio of 5.13 mL/g, and extraction time of 1.48 h) fructans extraction yield was 83.12%. The chromatographic profile of the agave crude extract presented four peaks, out of which fructans were the most preponderant (~87%). The obtained results suggest that the response surface...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fructans; Agave; Extraction yield; Optimization; Response surface methodology.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612016000400631
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Possibility of using neural networks for moisture ratio prediction in dried potatoes by means of different drying methods and evaluating physicochemical properties CIGR Journal
Yaghoubi, Marjan; Askari, Bijan; Mokhtarian, Mohsen; Tavakolipour, Hamid; Elhami Rad, Amirhosein; Jafarpour, Afshin; Heidarian, Soodabeh.
Potato cubes were dried by different drying methods.  After the end of drying process, the experimental data were first fitted to the four well-known drying models.  The results indicated that the logarithmic and page models performed better compared with the other models.  Also, in this study neural networks were used in order to possibly predict dried potato moisture ratio (y), based on three input variables of drying time, drying temperature and different methods.  The results revealed that, logsig function based on 10 neurons in the first hidden layer could perform as the best goodness configuration for predicting the moisture ratio.  The comparison of the obtained results of ANNs and classical modeling indicated that, the neural networks have a higher...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Extraction kinetics; Time constant; Extract concentration; Extraction yield; Medicinal herbs.
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2590
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Solid-liquid extraction of sorrel calyces with ethanol CIGR Journal
Olawale, Adegboyega Surajudeen.
  Ethanol extraction of three particle size distributions of sorrel (Hibiscus sabdariffa) calyces was investigated.  Extraction rate was found to increase with reduced particle size, increased temperature and solvent mass (solvent-feed ratio).  At 30oC, maximum yield or concentration was achieved with 50:1 solvent-feed ratio but no substantial increment occurred in these parameters beyond 20:1 ratio.  No degradation of the extract’s components occurred between 27oC and 70oC since linear relation between extraction yield and temperature was sustained.  Peleg equation and a variant of it gave the best fit for extraction kinetics.  The smallest calyx particles (
Tipo: Info:eu-repo/semantics/article Palavras-chave: Extraction kinetics; Time constant; Extract concentration; Extraction yield; Medicinal herbs.
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2577
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