title: Mass balance and transformation of corn stover by pretreatment with different dilute organic acids.
abstract: Previous studies indicated high xylose yield could be achieved after pretreatment using organic acids, but it is necessary to systematically investigate the effects of different parameters during organic acid pretreatments. Corn stover was pretreated with sulfuric, oxalic, citric, tartaric and acetic acid at 50 and 90 mM from 130 to 190°C. The xylan balance for each different acid was distinct, but all balances were very close to 100% by determining xylan recovery, xylooligomer yield, xylose yield and furfural yield. The effects of combined severity on the recovery or yields of these components were also studied. The acid pK(a) value affected the proportion of xylan degradation products. The maximum value of xylose and xylooligomer yield for specific acid pretreatment was also determined by pK(a) value. The maximum xylose yield was obtained after pretreatment with sulfuric and oxalic acid, but more xylooligomers were obtained after pretreatment with weaker acids.
authors.affiliation: Key Laboratory of Systems Bioengineering, Ministry of Education Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, P.O. Box 6888, Tianjin 300072, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Qin
authors.forename: Zhi-Hua
authors.initials: ZH
authors.lastname: Liu
authors.forename: Bing-Zhi
authors.initials: BZ
authors.lastname: Li
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Dale
authors.forename: Ying-Jin
authors.initials: YJ
authors.lastname: Yuan
mesh_terms: D001709:Biotechnology / Q000379:methods*; D002264:Carboxylic Acids / Q000494:pharmacology*; D006868:Hydrolysis / Q000187:drug effects; D008031:Lignin / Q000378:metabolism; D012995:Solubility / Q000187:drug effects; D014866:Waste Products / Q000032:analysis*; D014990:Xylans / Q000378:metabolism; D014994:Xylose / Q000378:metabolism; D003313:Zea mays / Q000737:chemistry*
chemical_list: D002264:Carboxylic Acids; D014866:Waste Products; D014990:Xylans; D008031:Lignin; D014994:Xylose