Process for obtaining solid soy isoflavone-containing products

A - Human Necessities – 23 – J

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A23J 3/14 (2006.01) A23J 3/16 (2006.01) A23L 1/30 (2006.01) C07D 311/36 (2006.01)

Patent

CA 2403584

A process for obtaining a solid soy isoflavone- and protein-containing isolate in which isoflavones constitute at least 7% of the isolate and are present in predominantly glycoside form, (genistin + genistein) constitute at least 50% of the isoflavones, the weight ratio (genistin + genistein):(daidzin + daidzein) is at least 1.5:1 and the bulk density is at least 0.57 g/ml.The process includes the sequential steps of (a) heating a soy soluble extract (SSE), made by aqueous alcohol extraction of defatted soy solids and evaporation of the alcohol, at acid pH and at a temperature within the range 70° -90°C to cause sedimentation of an insoluble fraction containing saponin, trypsin inhibitor and isoflavone compounds; (b) cooling the mixture from step (a) to a temperature of not lower than 30°C and separating the insoluble fraction from supernatant liquid in the mixture of step (a) at a temperature of not lower than 30°C; and (c) drying the separated insoluble fraction in a drying system adapted to produce a bulk density of at least 0.57 g/ml in the solid isolate.

L'invention porte sur un procédé d'obtention d'un isolat riche en isoflavones et protéines de soja dont les isoflavones, qui représentent au moins 7 %, sont majoritairement (au moins 50%) des glycosides, le rapport pondéral (génistine + génistéïne): (daïdzine + daïdzéïne) étant d'au moins 1,5/1, et la densité apparente d'au moins 0,57 g/ml. Le procédé comporte les étapes suivantes: (a) chauffer un extrait soluble de soja obtenu par extraction alcoolique de solides dégraissés de soja, puis évaporation de l'alcool avec un pH acide et sous une température comprise entre 70 DEG et 90 DEG C pour entraîner la sédimentation de la fraction insoluble contenant: de la saponine, un inhibiteur de la trypsine et des composés d'isoflavone; (b) refroidir le mélange de l'étape (a) jusqu'à une température non inférieure à 30 DEG C, et séparer la fraction insoluble dudit mélange du liquide surnageant à une température non inférieure à 30 DEG C; et (c) faire sécher la fraction insoluble séparée dans un système de séchage conçu pour produire une densité apparente d'au moins 0,57 g/ml dans l'isolat solide.

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