title: Comparison of sodium carbonate-oxygen and sodium hydroxide-oxygen pretreatments on the chemical composition and enzymatic saccharification of wheat straw.
abstract: Pretreatment of wheat straw with a combination of sodium carbonate (Na2CO3) or sodium hydroxide (NaOH) with oxygen (O2) 0.5MPa was evaluated for its delignification ability at relatively low temperature 110°C and for its effect on enzymatic hydrolysis efficiency. In the pretreatment, the increase of alkali charge (as Na2O) up to 12% for Na2CO3 and 6% for NaOH, respectively, resulted in enhancement of lignin removal, but did not significantly degrade cellulose and hemicellulose. When the pretreated solid was hydrolyzed with a mixture of cellulases and hemicellulases, the sugar yield increased rapidly with the lignin removal during the pretreatment. A total sugar yield based on dry matter of raw material, 63.8% for Na2CO3-O2 and 71.9% for NaOH-O2 was achieved under a cellulase loading of 20FPU/g-cellulose. The delignification efficiency and total sugar yield from enzymatic hydrolysis were comparable to the previously reported results at much higher temperature without oxygen.
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China; Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA. Electronic address: whgeng8@gmail.com.
authors.forename: Wenhui
authors.initials: W
authors.lastname: Geng
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China. Electronic address: ht_th_ht@163.com.
authors.forename: Ting
authors.initials: T
authors.lastname: Huang
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China. Electronic address: jinyongcan@njfu.edu.cn.
authors.forename: Yongcan
authors.initials: Y
authors.lastname: Jin
authors.affiliation: Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China. Electronic address: junlong.song@gmail.com.
authors.forename: Junlong
authors.initials: J
authors.lastname: Song
authors.affiliation: Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA. Electronic address: hchang@ncsu.edu.
authors.forename: Hou-Min
authors.initials: HM
authors.lastname: Chang
authors.affiliation: Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA. Electronic address: jameel@ncsu.edu.
authors.forename: Hasan
authors.initials: H
authors.lastname: Jameel
mesh_terms: D000468:Alkalies; D056804:Biofuels; D002254:Carbonates / Q000737:chemistry; D008031:Lignin / Q000737:chemistry*; D010100:Oxygen; D011312:Pressure; D012972:Sodium Hydroxide / Q000737:chemistry; D013696:Temperature; D014908:Triticum / Q000737:chemistry*
chemical_list: D000468:Alkalies; D056804:Biofuels; D002254:Carbonates; C005686:sodium carbonate; D012972:Sodium Hydroxide; D008031:Lignin; D010100:Oxygen
keywords: Alkali-oxygen pretreatment; Enzymatic hydrolysis; Lignin removal; Sugar; Wheat straw