title: Acid-catalyzed autohydrolysis of wheat straw to improve sugar recovery.
abstract: A comparison study of autohydrolysis and acid-catalyzed autohydrolysis of wheat straw was performed to understand the impact of acid addition on overall sugar recovery. Autohydrolysis combined with refining is capable of achieving sugar recoveries in the mid 70s. If the addition of a small amount of acid is capable of increasing the sugar recovery even higher it may be economically attractive. Acetic, sulfuric, hydrochloric and sulfurous acids were selected for acid-catalyzed autohydrolysis pretreatments. Autohydrolysis with no acid at 190 °C showed the highest total sugar in the prehydrolyzate. Enzymatic hydrolysis was performed for all the post-treated solids with and without refining at enzyme loadings of 4 and 10 FPU/g for 96 h. Acid-catalyzed autohydrolysis at 190 °C with sulfurous acid showed the highest total sugar recovery of 81.2% at 4 FPU/g enzyme charge compared with 64.3% at 190 °C autohydrolysis without acid.
authors.affiliation: Department of Forest Industry Engineering, Bursa Technical University, 16200 Bursa, Turkey. Electronic address: murat.ertas@btu.edu.tr.
authors.forename: Murat
authors.initials: M
authors.lastname: Ertas
authors.affiliation: Department of Forest Biomaterials, North Carolina State University, Campus Box 8005, Raleigh, NC 27695-8005, USA.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Han
authors.affiliation: Department of Forest Biomaterials, North Carolina State University, Campus Box 8005, Raleigh, NC 27695-8005, USA.
authors.forename: Hasan
authors.initials: H
authors.lastname: Jameel
mesh_terms: D000143:Acids / Q000494:pharmacology*; D002241:Carbohydrates / Q000302:isolation & purification*; D002384:Catalysis / Q000187:drug effects; D002480:Cellulase / Q000378:metabolism; D043364:Endo-1,4-beta Xylanases / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis / Q000187:drug effects; D013696:Temperature; D014908:Triticum / Q000737:chemistry* / Q000187:drug effects; D014866:Waste Products
chemical_list: D000143:Acids; D002241:Carbohydrates; D014866:Waste Products; D002480:Cellulase; D043364:Endo-1,4-beta Xylanases
keywords: Acid-catalyzed pretreatment; Chemical composition; Enzymatic hydrolysis; Sugar; Wheat straw