Process for recovering protein and fibre compositions from brwers' spent grain
AssigneeAnheuser-Busch InBev S.A.
InventorsSteffen MÜNCH, Daniel VALDEPEREZ
Life of this patent
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Abstract
The present disclosure provides processes for the production of protein and fibre compositions from brewer's spent grain. The process comprises micronising dried brewer's spent grain using a pin mill and fractionating the micronised brewer's spent grain using an air classifier. The present disclosure also provides protein and fibre compositions, processes for producing food products incorporating the protein or fibre compositions, and food products comprising the protein or fibre compositions.
Claims47
A process for producing a fibre composition and a protein composition, wherein the process comprises:
- a) providing dried brewer's spent grain having a moisture content of 10% by weight or less;
- b) micronising the dried brewer's spent grain using a pin mill to provide micronised brewer's spent grain;
- c) fractionating the micronised brewer's spent grain using an air classifier to provide a coarse fraction and a fine fraction;
- and
- d) collecting the coarse fraction to provide the fibre composition and collecting the fine fraction to provide the protein composition.
A process according to any preceding claim, wherein the brewer's spent grain has a total dietary fibre content (% dry matter by weight) of from 48% to less than 62%, as determined by AOAC 991.43, and a total protein content (% dry matter by weight) of greater than 20% to less than 35%, as determined by the Kjeldahl method using a conversion factor of 6.25.
A process according to any preceding claim, wherein the step of providing dried brewers' spent grain comprises collecting brewers' spent grain from a brewery and then drying to a moisture content of 10% by weight or less, preferably 8% or less, preferably 5% by weight or less.
A process according to any preceding claim, wherein the dried brewer's spent grain is subjected to declumping before micronising, preferably using a hammer mill.
A process according to any preceding claim, wherein the pin mill is a counter-rotating pin mill.
A process according to any preceding claim, wherein the micronised brewer's spent grain has a bimodal particle size distribution.
A process according to any preceding claim, wherein the micronised brewer's spent grain has a particle size (d50) of from 30 to 130 μm, preferably from 30 to 70 μm, preferably from 40 to 100 μm, preferably from 40 to 60 μm, and a particle size (d90) of from 150 to 350 μm, preferably from 150 to 300 μm, preferably from 190 to 280 μm, preferably from 190 to 260 μm, as determined by laser diffraction.
A process according to any preceding claim, wherein the fractionation comprises selecting the rotational speed and air flow rate of the air classifier to optimise the fractionation into the coarse fraction and the fine fraction.
A process for producing a fibre composition and a protein composition, wherein the process comprises:
- a) providing dried brewer's spent grain having a moisture content of 10% by weight or less;
- b) micronising the dried brewer's spent grain using a pin mill to provide micronised brewer's spent grain;
- c) fractionating the micronised brewer's spent grain using an air classifier to provide a first coarse fraction and a first fine fraction;
- d) micronising the first coarse fraction, preferably using a pin mill, to provide a micronised first coarse fraction;
- e) fractionating the micronised first coarse fraction, preferably using an air classifier, to provide a second coarse fraction and a second fine fraction;
- f) collecting the second coarse fraction to provide the fibre composition;
- and
- g) combining the first and second fine fractions to provide the protein composition.
A process for producing a fibre composition and a protein composition, wherein the process comprises:
- a) providing dried brewer's spent grain having a moisture content of 10% by weight or less;
- b) micronising the dried brewer's spent grain using a pin mill to provide micronised brewer's spent grain;
- c) fractionating the micronised brewer's spent grain using an air classifier to provide a first coarse fraction and a first fine fraction;
- d) fractionating the first coarse fraction, preferably using an air classifier, to provide a second coarse fraction and a second fine fraction;
- e) collecting the second coarse fraction to provide the fibre composition;
- and
- f) combining the first and second fine fractions to provide the protein composition.
A process according to any preceding claim, wherein the fibre composition has a particle size (d90) of between 200 and 500 μm, preferably between 200 and 450 μm, preferably between 250 and 350 μm, as determined by laser diffraction.
A process according to any preceding claim, wherein the fibre composition has a total dietary fibre content (% dry matter by weight) of greater than 55%, preferably greater than 60%, as determined by AOAC 991.43.
A process according to any preceding claim, wherein the fibre composition has a total insoluble fibre content (% dry matter by weight) of between 55 and 75%, preferably between 60 and 70%, and a total soluble dietary fibre content (% dry matter by weight) of between 0 and 10%, preferably between 0 and 5%, as determined by AOAC 2011.25.
A process according to any preceding claim, wherein the fibre composition has a total protein content (% dry matter by weight) of between 15 and 30%, preferably between 18 and 25%, as determined by the Kjeldahl method using a conversion factor of 6.25.
A process according to any preceding claim, wherein the fibre composition has a total combined content of protein and dietary fibre (% dry matter by weight) of between 70 and 100%, preferably between 85 and 100%, and a ratio of protein to dietary fibre (dry matter by weight) of between 0.30 and 0.55, preferably between 0.30 and 0.45, preferably between 0.30 and 0.40, wherein the total dietary fibre content is determined by AOAC 991.43 and the total protein content is determined by the Kjeldahl method using a conversion factor of 6.25.
A process according to any preceding claim, wherein the fibre composition has a bulk density of from 0.34 to 0.45 g/mL, a tapped density of from 0.42 to 0.60 g/mL and a Hausner index of from 1.15 to 1.34, preferably from 1.20 to 1.24.
A process according to any preceding claim, wherein the total dietary fibre content (dry matter by weight) of the fibre composition is at least 10%, preferably at least 12%, preferably at least 14% higher than the total dietary fibre content (dry matter by weight) of the brewer's spent grain, as determined by AOAC 991.43.
A process according to any preceding claim, wherein the total protein content (dry matter by weight) of the fibre composition is at least 16%, preferably at least 18%, preferably at least 20% lower than the total protein content (dry matter by weight) of the brewer's spent grain, as determined by the Kjeldahl method using a conversion factor of 6.25.
A process according to any preceding claim, wherein the fibre composition has an iron content of from 9 to 15 mg, preferably from 10 to 14 mg, per 100 g (dry matter) of the fibre composition.
A process according to any preceding claim, wherein the iron content of the fibre composition is at least 18%, preferably at least 24%, preferably at least 26%, preferably at least 28% lower than the iron content of the brewer's spent grain.
A process according to any preceding claim, wherein the protein composition has a particle size (d90) of between 20 and 200 μm, preferably between 40 and 130 μm, preferably between 50 and 130 μm, preferably between 50 and 100 μm, as determined by laser diffraction.
A process according to any preceding claim, wherein the protein composition has a total dietary fibre content (% dry matter by weight) of greater than 35% and below 55%, as determined by AOAC 991.43.
A process according to any preceding claim, wherein the protein composition has a total insoluble fibre content (% dry matter by weight) of between 30 and 60%, preferably between 35 and 50%, and a total soluble dietary fibre content (% dry matter by weight) of between 0 and 10%, preferably between 1 and 5%, as determined by AOAC 2011.25.
A process according to any preceding claim, wherein the protein composition has a total protein content (% dry matter by weight) of at least 33%, preferably between 33 and 50%, preferably between 35 and 40%, as determined by the Kjeldahl method using a conversion factor of 6.25.
A process according to any preceding claim, wherein the protein composition has a total combined content of protein and dietary fibre (% dry matter by weight) of between 80 and 100% and a ratio of protein to dietary fibre (dry matter by weight) of between 0.75 and 1.5, wherein the total dietary fibre content is determined by AOAC 991.43 and the total protein content is determined by the Kjeldahl method using a conversion factor of 6.25.
A process according to any preceding claim, wherein the protein composition has a bulk density of from 0.25 to 0.35 g/mL, a tapped density of from 0.30 to 0.42 g/mL and a Hausner index of from 1.18 to 1.30, preferably from 1.18 to 1.22.
A process according to any preceding claim, wherein the total protein content (dry matter by weight) of the protein composition is at least 19%, preferably at least 21%, preferably at least 23% higher than the total protein content (dry matter by weight) of the brewer's spent grain, as determined by the Kjeldahl method using a conversion factor of 6.25.
A process according to any preceding claim, wherein the total dietary fibre content (dry matter by weight) of the protein composition is at least 13%, preferably at least 14%, preferably at least 16% lower than the total dietary fibre content (dry matter by weight) of the brewer's spent grain, as determined by AOAC 991.43.
A process according to any preceding claim, wherein the protein composition has an iron content of from 14 to 26 mg, preferably from 17 to 26 mg, preferably from 19 to 25 mg, per 100 g (dry matter) of the protein composition.
A process according to any preceding claim, wherein the iron content of the protein composition is at least 20%, preferably at least 24%, preferably at least 26%, preferably at least 28% higher than the iron content of the brewer's spent grain.
A fibre composition produced from brewer's spent grain, wherein the fibre composition:
- is in the form of a powder having a particle size (d90) of between 200 and 500 μm, preferably between 200 and 450 μm, preferably between 250 and 350 μm, as determined by laser diffraction;
- has a total dietary fibre content (% dry matter by weight) of greater than 55%, preferably greater than 60%, as determined by AOAC 991.43;
- has a total insoluble fibre content (% dry matter by weight) of between 55 and 75%, preferably between 60 and 70%, and a total soluble dietary fibre content (% dry matter by weight) of between 0 and 10%, preferably between 0 and 5%, as determined by AOAC 2011.25;
- and
- has a total protein content (% dry matter by weight) of between 15 and 30%, preferably between 18 and 25%, as determined by the Kjeldahl method using a conversion factor of 6.25.
A protein composition produced from brewer's spent grain, wherein the protein composition:
- is in the form of a powder having a particle size (d90) of between 20 and 200 μm, preferably between 40 and 130 μm, preferably between 50 and 130 μm, preferably between 50 and 100 μm, as determined by laser diffraction;
- has a total dietary fibre content (% dry matter by weight) of greater than 35% and below 55%, as determined by AOAC 991.43;
- has a total insoluble fibre content (% dry matter by weight) of between 30 and 60%, preferably between 35 and 50%, and a total soluble dietary fibre content (% dry matter by weight) of between 0 and 10%, preferably between 1 and 5%, as determined by AOAC 2011.25;
- and
- has a total protein content (% dry matter by weight) of at least 33%, preferably between 33 and 50%, preferably between 35 and 40%, as determined by the Kjeldahl method using a conversion factor of 6.25.
Dependencies are inferred from the claim text.