title: Effect of dilute acid pretreatment on the conversion of barley straw with grains to fermentable sugars.
abstract: This study investigated the effects of pretreatment conditions, dilute sulfuric acid concentration and treatment time, on the carbohydrate solubility of a mixture of barley straw and grain. The conditions were expressed as combined severity (CS) to evaluate sugar recovery from pretreated samples. Enzymatic hydrolysates from the lignocellulose pretreatment residues were also included to the results. CS was positively correlating with glucose recovery in all conditions, but in higher acid concentrations CS did not predict xylose recovery. It appeared that the residual xylan better indicate the xylose release. An optimal fermentable sugar yield from the mixture of barley straw and grain was obtained by maintaining the CS at around 1.38, corresponding to an overall glucose yield of 96% and a xylose yield of 57%.
authors: School of Forest Sciences, University of Eastern Finland, P.O. Box 111, FI80101 Joensuu, Finland. Electronic address: ming.yang@uef.fi.
authors: Ming
authors: M
authors: Yang
authors: School of Forest Sciences, University of Eastern Finland, P.O. Box 111, FI80101 Joensuu, Finland.
authors: Suvi
authors: S
authors: Kuittinen
authors: College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling 712100, China.
authors: Junhua
authors: J
authors: Zhang
authors: Department of Biology, University of Eastern Finland, P.O. Box 111, FI80101 Joensuu, Finland.
authors: Markku
authors: M
authors: Keinänen
authors: School of Forest Sciences, University of Eastern Finland, P.O. Box 111, FI80101 Joensuu, Finland.
authors: Ari
authors: A
authors: Pappinen
mesh_terms: D000143:Acids / Q000737:chemistry*; D056804:Biofuels; D018533:Biomass; D002241:Carbohydrates / Q000737:chemistry*; D005285:Fermentation; D008401:Gas Chromatography-Mass Spectrometry; D005947:Glucose / Q000737:chemistry; D001467:Hordeum / Q000378:metabolism*; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D013997:Time Factors; D014990:Xylans / Q000737:chemistry; D014994:Xylose / Q000737:chemistry
chemical_list: D000143:Acids; D056804:Biofuels; D002241:Carbohydrates; D013464:Sulfuric Acids; D014990:Xylans; C036909:lignocellulose; D008031:Lignin; D014994:Xylose; D005947:Glucose; C033158:sulfuric acid
keywords: Barley straw; Dilute-acid pretreatment; Fermentable sugars; Grain