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US 5,312,636 AGranted
Process for fractioning crop into industrial raw material
AssigneeValtion Teknillinen Tutkimuskeskus
InventorsOlavi Myllymaki, Yrjo Malkki, Karin Autio
Life of this patent
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Abstract
A process for fractioning crops by using a combined dry and wet milling and extraction methods, whereby extruding or percussive devices and operating methods are used in the dry milling step, and a thermal treatment, solvent extraction and mechanical treatment, which destroy most of the enzymes, are combined in the first wet milling step.
Claims4
A process for concentrating and separating dietary fiber, starch, antioxidant oil, protein and gum products from dehulled or hull-less oat grains, comprising:
- (a) dry milling of dehulled or hull-less oat grains by using at least one of pressing, flaking or impacting operations, such that said milling does not include substantial shearing of said grains, whereby a mixture of coarse bran and a first fine endosperm are provided;
- (b) dividing said mixture into a first fine endosperm fraction and a coarse bran fraction;
- (c) forming a suspension of said coarse bran fraction with an extraction mixture of polar organic solvent and water, agitating said suspension, thereby substantially inactivating enzymes present in said coarse bran fraction, and separating said suspension by at least one of sieving, sedimentation and hydrocyclonic treatment into a coarse concentrated bran fraction and a second fine endosperm fraction, and a lipid fraction, whereby said lipid fraction contains antioxidants which are extracted by said extraction mixture of polar organic solvent and water;
- (d) extracting beta glucan from said coarse concentrated bran fraction by successively:
- (i) subjecting said coarse concentrated bran fraction to alkaline solution at a temperature of 50.degree. to 75.degree. C., and separation, such that a degummed coarse concentrated bran fraction and an extract are provided;
- (ii) deproteinizing said extract by isoelectric precipitation and separation to provide a protein product and a deproteinized extract, and
- (iii) precipitating beta glucan from said deproteinized extract by mixing said deproteinized extract with a precipitating agent selected from the group consisting of ethanol, 2-propanol and a solution of ammonium sulphate, thereby forming a fibrous precipitate of beta glucan;
- (e) separating starch from said first or second fine endosperm fraction by extraction with an alkaline solution at about 40.degree. C., followed by at least one of sedimentation, hydrocyclonic treatment or air classification.
5 more elements
Dependencies are inferred from the claim text.