title: Alkali pretreatment of wheat straw (Triticum aestivum) at boiling temperature for producing a bioethanol precursor.
abstract: We evaluated the effect of dilute sodium hydroxide (NaOH) on wheat straw at boiling temperature for removing lignin and increasing the yield of reducing sugar. Various concentrations of NaOH (0.5% to 2%) were used for pretreating wheat straw at 105 °C for 10 min. Scanning electron microscopy, atomic force microscopy, and Fourier transform infrared spectroscopy studies revealed that the 2% NaOH-pretreated sample exposed more cellulose fiber. The maximum respective removal of lignin and hemicellulose was 70.3% and 68.2% from the 2% NaOH-pretreated liquor. The reducing sugar yield was 84.6% using an enzyme dose containing 20 FPU of cellulase, 40 IU of β-glucosidase and 4 FXU of xylanase/g of substrate. However, 2% NaOH-treated wheat straw had the lowest crystalline index of 52.5%, due to destructured cellulose fibers. The results indicate the effectiveness of producing the bioethanol precursor from wheat straw by using 2% NaOH at boiling temperature.
authors.affiliation: Division of Applied Life Science (BK21 Program), Gyeongsang National University, Chinju, Republic of Korea.
authors.forename: Dhirendra Nath
authors.initials: DN
authors.lastname: Barman
authors.forename: Md Azizul
authors.initials: MA
authors.lastname: Haque
authors.forename: Tae Ho
authors.initials: TH
authors.lastname: Kang
authors.forename: Min Keun
authors.initials: MK
authors.lastname: Kim
authors.forename: Jungho
authors.initials: J
authors.lastname: Kim
authors.forename: Hoon
authors.initials: H
authors.lastname: Kim
authors.forename: Han Dae
authors.initials: HD
authors.lastname: Yun
mesh_terms: D056804:Biofuels; D002482:Cellulose / Q000378:metabolism; D000431:Ethanol / Q000737:chemistry / Q000378:metabolism*; D006868:Hydrolysis / Q000187:drug effects; D007700:Kinetics; D008031:Lignin / Q000378:metabolism; D011134:Polysaccharides / Q000378:metabolism; D012972:Sodium Hydroxide / Q000494:pharmacology*; D044366:Transition Temperature; D014908:Triticum / Q000737:chemistry / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism*
chemical_list: D056804:Biofuels; D011134:Polysaccharides; D000431:Ethanol; D012972:Sodium Hydroxide; C007916:hemicellulose; D002482:Cellulose; D008031:Lignin