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Fractionation of the main components of barley spent grains from a microbrewery
- Dehnavi, Gholamali Z. (author)
- Lauceria, Jose L. (author)
- Rodriguez, Dani (author)
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- Beaton, Milagros (author)
- Martin, Carlos (author)
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- (creator_code:org_t)
- 2011
- 2011
- English.
- In: Cellulose Chemistry and Technology. - 0576-9787. ; 45:5-6, s. 339-345
- Journal article (peer-reviewed)
Abstract
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- The chemical composition of barley spent grains generated in a microbrewery and their fractionation by acid hydrolysis and delignification were investigated. The material contained high amount of carbohydrates (60%), while its lignin content was lower than that reported for other sorts of barley spent grains. Different dilute-acid hydrolysis methods were evaluated for separating the main components of the spent grains, without affecting the sugars generated by starch hydrolysis. The utilization of a two-step dilute-acid hydrolysis approach allowed to hydrolyse starch in a first step, at 100 ºC, and hemicelluloses in a second step, at 121 ºC. Acetosolv and alkaline delignification were used for solubilising the lignin fraction. A higher lignin solubilisation (95% of the lignin contained in the raw material) was achieved after alkaline delignification, whereas only 34% of the initial lignin was removed by direct acetosolv. When the acetosolv treatment was combined with acid hydrolysis, lignin solubilisation increased to 74%. Lignin was precipitated from the liquors at recovery rates from 40 to 93%, as depending on the hydrolysis/delignification method used.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Industriell bioteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Industrial Biotechnology (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
Keyword
- barley spent grains
- acid hydrolysis
- alkaline delignification
- acetosolv
- Resursåtervinning
- Resursåtervinning
- Resource Recovery
Publication and Content Type
- ref (subject category)
- art (subject category)
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