Twin-screw extrusion technology, an original solution for the extraction of proteins from alfalfa (Medicago sativa)
2013
Colas, Dorothée | Doumeng, Catherine | Pontalier, Pierre-Yves, P.-Y. | Rigal, Luc | Chimie Agro-Industrielle (CAI) ; Institut National de la Recherche Agronomique (INRA)-Ecole nationale supérieure des ingénieurs en arts chimiques et technologiques (ENSIACET) ; Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT)-Université de Toulouse (UT) | Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT) | CP2D program (Chimie et Procedes pour le developpement durable: Chemistry and Processes for Sustainable Development) [ANR 07 CP2D 16-03]
International audience
Mostrar más [+] Menos [-]Inglés. The aim of this study is to develop a new approach to green plant fractionation using twin-screw extrusion, leading to the production of a green filtrate, rich in proteins and a solid fibrous residue, rich in cellulose. The influence of the screw profile on protein recovery in the liquid extract and on plant dehydration was characterized. Two screw profiles were tested, at different temperatures and liquid/solid ratios. Increasing the shearing action on the plant produces a liquid extract richer in protein; from 25% of dry matter to 31% of dry matter when two additional sections of paddle screw elements are inserted onto the screw profile. However, it leads to higher liquid retention in the alfalfa fibers and thus dehydration of the plant is less efficient. The fibrous residue still contains at least 60% humidity when the alfalfa is highly degraded, whereas less than 47% humidity remain with only one section of bilobe paddle screws on the profile. For the two screw profiles tested, the crucial parameter influencing the fraction quality (protein content of the filtrate, dry matter content of the fibrous residue) is the liquid/solid ratio. (C) 2013 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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