Process for the production of light colored food grade protein and dietary fibre from grainby-products
First Claim
1. An integrated process for preparing food grade bleached purified stable protein and dietary fibre concentrates from wheat millfeed comprising the steps of:
- (a) mixing wheat millfeed of particle size less than 1680 μ
m with an alkali solution to produce a slurry with solvent/millfeed ratio in the range of 7;
1 to 10;
1 v/w and having pH in the range of pH 9-11;
(b) separating the slurry to remove the alkali liquid to isolate alkali extract and form a millfeed residue;
(c) removing starch and fat from the alkali extract;
(d) ultrafiltration of the alkali extract to form a retantate using a semi-permeable membrane;
(e) bleaching the retantate by adding hydrogen peroxide and heating;
(f) cooling and drying the bleached retantate to provide a protein concentrate;
(g) adding water and 35-70% w/v hydrogen peroxide to said millfeed residue to produce a slurry;
(h) heating said slurry containing millfeed residue to a temperature of 50°
-100°
C.; and
(i) decanting liquid from the slurry and drying the residue to produce a dietary fibre concentrate.
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Accused Products
Abstract
Food grade protein and dietary fibre concentrates are prepared from wheat millfeed. The process utilizes an efficient alkali extraction to obtain in excess of 75% w/w of the protein present in the millfeed in a solution which is further treated to separate the suspended starch and fat. The clarified liquid containing the protein is passed over a semipermeable membrane during which it is further purified and concentrated. Hydrogen peroxide and heat are introduced to the liquid thereby reducing its color prior to spray drying. The resulting residue from the extraction is dried or further treated with hydrogen peroxide and heat to produce a light colored dietary fibre concentrate.
38 Citations
10 Claims
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1. An integrated process for preparing food grade bleached purified stable protein and dietary fibre concentrates from wheat millfeed comprising the steps of:
-
(a) mixing wheat millfeed of particle size less than 1680 μ
m with an alkali solution to produce a slurry with solvent/millfeed ratio in the range of 7;
1 to 10;
1 v/w and having pH in the range of pH 9-11;(b) separating the slurry to remove the alkali liquid to isolate alkali extract and form a millfeed residue; (c) removing starch and fat from the alkali extract; (d) ultrafiltration of the alkali extract to form a retantate using a semi-permeable membrane; (e) bleaching the retantate by adding hydrogen peroxide and heating; (f) cooling and drying the bleached retantate to provide a protein concentrate; (g) adding water and 35-70% w/v hydrogen peroxide to said millfeed residue to produce a slurry; (h) heating said slurry containing millfeed residue to a temperature of 50°
-100°
C.; and(i) decanting liquid from the slurry and drying the residue to produce a dietary fibre concentrate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for preparing food grade bleached dietary fibre concentrate from wheat millfeed comprising the steps of:
-
(a) mixing wheat grain millfeed of particle size less than 1680 μ
m with a sodium hydroxide solution to produce a slurry with solvent/millfeed ratio in the range of 7;
1 to 10;
1 v/w having pH in the range of pH 9-11;(b) separating the alkali liquid from the slurry to isolate alkali extract and form a millfeed residue; (c) adding water and 35-70% w/v hydrogen peroxide 1-14% to said millfeed residue to produce a slurry; (d) heating said slurry to a temperature of 80°
-100°
C.;(e) decanting the liquid and drying the residue to produce a dietary fibre concentrate. - View Dependent Claims (9, 10)
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Specification