Valuation of brewer's spent grain using a fully recyclable integrated process for extraction of proteins and arabinoxylans
•A sequential extraction of proteins and arabinoxylans from BSG with increasing alkali strength was performed.•A ratio of 1:2 (w/v) at room temperature for 24h saves reagents and energy.•A yield of 82–85% of the BSG total proteins and 66–73% of total AX were obtained.•Alkaline extracts were acidifie...
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| Published in | Industrial crops and products Vol. 52; pp. 136 - 143 |
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| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.01.2014
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0926-6690 1872-633X |
| DOI | 10.1016/j.indcrop.2013.10.012 |
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| Abstract | •A sequential extraction of proteins and arabinoxylans from BSG with increasing alkali strength was performed.•A ratio of 1:2 (w/v) at room temperature for 24h saves reagents and energy.•A yield of 82–85% of the BSG total proteins and 66–73% of total AX were obtained.•Alkaline extracts were acidified to pH 3 with citric acid, to obtain the protein-rich fractions.•The AX were recovered by ethanol precipitation and citric acid and ethanol were recycled.
The objective of this work was to design an integrated process to valuate brewer's spent grain (BSG) proteins and arabinoxylans (AX) to be used as food ingredients. For this purpose, a sequential extraction of proteins and AX from BSG with increasing alkali (KOH or NaOH) concentrations of 0.1M, 0.5M, and 4M, was optimized. A ratio of 1:2 (w/v) (weight of BSG by volume of alkali solution) at room temperature for 24h was preferred to minimize reagents and energy consumption. To fully integrate the process, alkaline extracts were acidified to pH3 with citric acid, to obtain the protein-rich fractions. The AX were recovered by ethanol precipitation and citric acid and ethanol were recycled. This integrated extraction process allowed a yield of 82–85% of the BSG total proteins and 66–73% of total AX with formation of a cellulose rich residue almost devoid of nitrogen. |
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| AbstractList | The objective of this work was to design an integrated process to valuate brewer's spent grain (BSG) proteins and arabinoxylans (AX) to be used as food ingredients. For this purpose, a sequential extraction of proteins and AX from BSG with increasing alkali (KOH or NaOH) concentrations of 0.1M, 0.5M, and 4M, was optimized. A ratio of 1:2 (w/v) (weight of BSG by volume of alkali solution) at room temperature for 24h was preferred to minimize reagents and energy consumption. To fully integrate the process, alkaline extracts were acidified to pH3 with citric acid, to obtain the protein-rich fractions. The AX were recovered by ethanol precipitation and citric acid and ethanol were recycled. This integrated extraction process allowed a yield of 82–85% of the BSG total proteins and 66–73% of total AX with formation of a cellulose rich residue almost devoid of nitrogen. •A sequential extraction of proteins and arabinoxylans from BSG with increasing alkali strength was performed.•A ratio of 1:2 (w/v) at room temperature for 24h saves reagents and energy.•A yield of 82–85% of the BSG total proteins and 66–73% of total AX were obtained.•Alkaline extracts were acidified to pH 3 with citric acid, to obtain the protein-rich fractions.•The AX were recovered by ethanol precipitation and citric acid and ethanol were recycled. The objective of this work was to design an integrated process to valuate brewer's spent grain (BSG) proteins and arabinoxylans (AX) to be used as food ingredients. For this purpose, a sequential extraction of proteins and AX from BSG with increasing alkali (KOH or NaOH) concentrations of 0.1M, 0.5M, and 4M, was optimized. A ratio of 1:2 (w/v) (weight of BSG by volume of alkali solution) at room temperature for 24h was preferred to minimize reagents and energy consumption. To fully integrate the process, alkaline extracts were acidified to pH3 with citric acid, to obtain the protein-rich fractions. The AX were recovered by ethanol precipitation and citric acid and ethanol were recycled. This integrated extraction process allowed a yield of 82–85% of the BSG total proteins and 66–73% of total AX with formation of a cellulose rich residue almost devoid of nitrogen. |
| Author | Pinho, Olívia Coelho, Elisabete Saraiva, Jorge A. Ferreira, Isabel M.P.L.V.O. Rocha, M. Angélica M. Coimbra, Manuel A. Vieira, Elsa |
| Author_xml | – sequence: 1 givenname: Elsa surname: Vieira fullname: Vieira, Elsa organization: REQUIMTE – Deapartamento de Ciências Químicas, Laboratório de Bromatologia e Hidrologia, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira 228, 450-313 Porto, Portugal – sequence: 2 givenname: M. Angélica M. surname: Rocha fullname: Rocha, M. Angélica M. organization: QOPNA, Departamento de Química, Universidade de Aveiro, 3810-193 Aveiro, Portugal – sequence: 3 givenname: Elisabete surname: Coelho fullname: Coelho, Elisabete organization: QOPNA, Departamento de Química, Universidade de Aveiro, 3810-193 Aveiro, Portugal – sequence: 4 givenname: Olívia surname: Pinho fullname: Pinho, Olívia organization: REQUIMTE – Deapartamento de Ciências Químicas, Laboratório de Bromatologia e Hidrologia, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira 228, 450-313 Porto, Portugal – sequence: 5 givenname: Jorge A. surname: Saraiva fullname: Saraiva, Jorge A. organization: QOPNA, Departamento de Química, Universidade de Aveiro, 3810-193 Aveiro, Portugal – sequence: 6 givenname: Isabel M.P.L.V.O. surname: Ferreira fullname: Ferreira, Isabel M.P.L.V.O. organization: REQUIMTE – Deapartamento de Ciências Químicas, Laboratório de Bromatologia e Hidrologia, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira 228, 450-313 Porto, Portugal – sequence: 7 givenname: Manuel A. orcidid: 0000-0001-8898-6342 surname: Coimbra fullname: Coimbra, Manuel A. email: mac@ua.pt organization: QOPNA, Departamento de Química, Universidade de Aveiro, 3810-193 Aveiro, Portugal |
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| Snippet | •A sequential extraction of proteins and arabinoxylans from BSG with increasing alkali strength was performed.•A ratio of 1:2 (w/v) at room temperature for 24h... The objective of this work was to design an integrated process to valuate brewer's spent grain (BSG) proteins and arabinoxylans (AX) to be used as food... |
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| SubjectTerms | ambient temperature arabinoxylan Arabinoxylans Brewer's spent grain cellulose citric acid energy ethanol ingredients nitrogen potassium hydroxide Proteins Recycling sodium hydroxide spent grains |
| Title | Valuation of brewer's spent grain using a fully recyclable integrated process for extraction of proteins and arabinoxylans |
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