Process for the fractionation of cereal brans

A - Human Necessities – 23 – L

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A23L 1/10 (2006.01) A23D 9/00 (2006.01) A23J 1/12 (2006.01) A23L 1/0534 (2006.01) A23L 1/105 (2006.01) C11B 1/02 (2006.01) C11B 1/10 (2006.01)

Patent

CA 2438270

A process for the fractionation of valuable fractions from cereal brans (e.g. wheat, barley and oat brans, and rice polish) is described. In particular, this invention describes a two step process, in which the said bran is first subjected to a combination of enzymatic treatment and wet milling, followed by sequential centrifugation and ultrafiltration, which aims at physically separating the main bran factions, i.e. insoluble phase (pericarp and aleurone layer), germ-rich fraction, residual endosperm fraction and soluble sugars. A second step consists of fractionating cereal brans substantially free of soluble compounds, hence insoluble phase from the above-mentioned first step, by enzymatic treatment with xylanases and/or beta-glucanase and wet milling, followed by sequential centrifugation and ultrafiltration, which aims at physically separating the main fractions, i.e. insoluble phase (remaining cell wall components), protein-rich fraction, soluble hemicellulose and oligosaccharide, and therefore maximizes the extraction rate of valuable cell wall components and aleurone cells from previously cleaned bran.

L'invention concerne un procédé de fractionnement de fractions valables du son de céréales (notamment du son de blé, d'orge et d'avoine, et les issues de polissage de riz). L'invention concerne notamment un procédé en deux temps. Dans un premier temps, le son est soumis à un traitement enzymatique associé à un concassage humide, puis à une centrifugation et une ultrafiltration séquentielle, qui visent à séparer physiquement les principales fractions de son, notamment la phase insoluble (péricarpe et couche à aleurone), la fraction riche en germes, la fraction albumen résiduelle et les sucres solubles. Dans un deuxième temps, le son de céréale est fractionné de manière à être sensiblement exempt de composés solubles, notamment la phase insoluble susmentionnée à l'étape 1, par traitement enzymatique avec des xylanases et/ou la béta-glucanase et par concassage humide, suivi d'une centrifugation et d'une ultrafiltration séquentielle qui visent à séparer physiquement les principales fractions, notamment la phase insoluble (constituants membranaires restants), la fraction riche en protéines, les hémicelluloses solubles et l'oligosaccharide, et ainsi de maximiser le taux d'extraction des constituants membranaires valables et les cellules aleurone du son précédemment nettoyé.

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