Sugar production from barley straw biomass pretreated by combined alkali and enzymatic extrusion

A pretreatment that combines a thermo-mechanical process (extrusion) with chemical and biological catalysts to produce fermentable sugars from barley straw (BS) biomass was investigated. BS was firstly extruded with alkali and then, the pretreated material (extrudate) was submitted to extrusion with...

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Bibliographic Details
Published in:Bioresource technology 2014-04, Vol.158, p.262-268
Main Authors: DUQUE, A, MANZANARES, P, BALLESTEROS, I, NEGRO, M. J, OLIVA, J. M, GONZALEZ, A, BALLESTEROS, M
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Alkalies - chemistry
Barley straw
Biological and medical sciences
Biomass
Biotechnology
Carbohydrates - biosynthesis
Enzymes - chemistry
Extrusion
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Glucose
Hordeum - metabolism
Hydrolysis
Pretreatment
Sugars
Use of agricultural and forest wastes. Biomass use, bioconversion
Xylose
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Summary:A pretreatment that combines a thermo-mechanical process (extrusion) with chemical and biological catalysts to produce fermentable sugars from barley straw (BS) biomass was investigated. BS was firstly extruded with alkali and then, the pretreated material (extrudate) was submitted to extrusion with hydrolytic enzymes (bioextrusion). The bioextrudate was found to have 35% (w/w dwb) of total solids in soluble form, partly coming from carbohydrate hydrolysis during bioextrusion. About 48% of soluble solids dry weight is comprised by sugars, mostly glucose and xylose. Further enzymatic hydrolysis of bioextrudate could be successfully carried out at high solid loading level of 30% (w/v), with sugar production yield of 32 g glucose and 18 g xylose/100g bioextrudate at 72 h incubation (equivalent to 96 and 52 g/l concentration, respectively). These results, together with the high level of integration of the process, indicate a great potential of this pretreatment technology for sugar production from lignocellulosic substrates.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2014.02.041