Comparison between solid-state and powder-state alkali pretreatment on saccharification and fermentation for bioethanol production from rice straw. Issue 3 (2nd April 2016)

• Record Type: Journal Article
• Authors: Yeasmin, Shabina; Kim, Chul-Hwan; Islam, Shah Md. Asraful; Lee, Ji-Young
• Is Part Of: Preparative biochemistry & biotechnology. Volume 46:Issue 3(2016)
• Page Start: 229
• Page End: 237
• Publication Date: 2016-04-02
• Subjects: Alkali pretreatment -- bioethanol -- powder-state -- rice straw -- solid-state; Biochemistry -- Technique -- Periodicals; Biotechnology -- Technique -- Periodicals; Biochemistry -- methods -- Periodicals; Biotechnology -- methods -- Periodicals; 660.6
• DOI: 10.1080/10826068.2015.1015563
• Languages: English
• ISSNs: 1082-6068

Abstract

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.