title: Comparison between solid-state and powder-state alkali pretreatment on saccharification and fermentation for bioethanol production from rice straw.
abstract: The efficacy of different concentrations of NaOH (0.25%, 0.50%, 0.75%, and 1.00%) for the pretreatment of rice straw in solid and powder state in enzymatic saccharification and fermentation for the production of bioethanol was evaluated. A greater amount of biomass was recovered through solid-state pretreatment (3.74 g) from 5 g of rice straw. The highest increase in the volume of rice straw powder as a result of swelling was observed with 1.00% NaOH pretreatment (48.07%), which was statistically identical to 0.75% NaOH pretreatment (32.31%). The surface of rice straw was disrupted by the 0.75% NaOH and 1.00% NaOH pretreated samples as observed using field-emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). In Fourier-transform infrared (FT-IR) spectra, absorbance of hydroxyl groups at 1,050 cm(-1) due to the OH group of lignin was gradually decreased with the increase of NaOH concentration. The greatest amounts of glucose and ethanol were obtained in 1.00% NaOH solid-state pretreated and powder-state hydrolyzed samples (0.804 g g(-1) and 0.379 g g(-1), respectively), which was statistically similar to the use of 0.75% NaOH (0.763 g g(-1) and 0.358 g g(-1), respectively). Thus, solid-state pretreatment with 0.75% NaOH and powder-state hydrolysis appear to be suitable for fermentation and bioethanol production from rice straw.
authors: a Department of Forest Products, IALS , Gyeongsang National University , Jinju , South Korea.
authors: Shabina
authors: S
authors: Yeasmin
authors: a Department of Forest Products, IALS , Gyeongsang National University , Jinju , South Korea.
authors: Chul-Hwan
authors: CH
authors: Kim
authors: b Department of Plant Pathology , Patuakhali Science and Technology University , Dumki , Patuakhali , Bangladesh.
authors: Shah Md Asraful
authors: SM
authors: Islam
authors: a Department of Forest Products, IALS , Gyeongsang National University , Jinju , South Korea.
authors: Ji-Young
authors: JY
authors: Lee
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D006868:Hydrolysis; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D012275:Oryza / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D000468:Alkalies; D000431:Ethanol
keywords: Alkali pretreatment; bioethanol; powder-state; rice straw; solid-state