title: Comparison of aqueous ammonia and dilute acid pretreatment of bamboo fractions: Structure properties and enzymatic hydrolysis.
abstract: The effect of two pretreatments methods, aqueous ammonia (SAA) and dilute acid (DA), on the chemical compositions, cellulose crystallinity, morphologic change, and enzymatic hydrolysis of bamboo fractions (bamboo yellow, timber, green, and knot) was compared. Bamboo fractions with SAA pretreatment had better hydrolysability than those with DA pretreatment. High crystallinity index resulted in low hydrolysis yield in the conversion of SAA pretreated bamboo fractions, not DA pretreated fractions. The increase of cellulase loading had modestly positive effect in the hydrolysis of both SAA and DA pretreated bamboo fractions, while supplement of xylanase significantly increased the hydrolysis of the pretreated bamboo fractions, especially after SAA pretreatment. The results indicated that SAA pretreatment was more effective than DA pretreatment in conversion of bamboo fractions, and supplementation of xylanase was necessary in effective conversion of the SAA pretreated fractions into fermentable sugars.
authors.affiliation: College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling 712100, China.
authors.forename: Donglin
authors.initials: D
authors.lastname: Xin
authors.affiliation: Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Yang
authors.affiliation: College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling 712100, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.affiliation: College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling 712100, China.
authors.forename: Xueru
authors.initials: X
authors.lastname: Xu
authors.affiliation: College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling 712100, China. Electronic address: junhuazhang@nwsuaf.edu.cn.
authors.forename: Junhua
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000143:Acids / Q000737:chemistry / Q000494:pharmacology*; D000641:Ammonia / Q000737:chemistry / Q000494:pharmacology*; D002480:Cellulase / Q000378:metabolism; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism; D005591:Chemical Fractionation; D043364:Endo-1,4-beta Xylanases / Q000378:metabolism; D006868:Hydrolysis / Q000187:drug effects; D031787:Sasa / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D014867:Water / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D000143:Acids; D014867:Water; D000641:Ammonia; D002482:Cellulose; D002480:Cellulase; D043364:Endo-1,4-beta Xylanases
keywords: Aqueous ammonia pretreatment; Bamboo fractions; Dilute acid pretreatment; Enzymatic hydrolysis; Structure properties