Biorefinery of sweet sorghum stem

Yu, J. and Zhang, T. and Zhong, J. and Zhang, X. and Tan, T (2012) Biorefinery of sweet sorghum stem. Biotechnology Advances, 30 (4). pp. 811-816.

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Abstract

Sweet sorghum has been considered as a viable energy crop for alcohol fuel production. This review discloses a novel approach for the biorefining of sweet sorghum stem to produce multiple valuable products, such as ethanol, butanol and wood plastic composites. Sweet sorghum stem has a high concentration of soluble sugars in its juice, which can be fermented to produce ethanol by Saccharomyces cerevisiae. In order to obtain high ethanol yield and fermentation rates, concentrated juice with an initial total sugar concentration of 300 g L− 1 was fermented. The maximum ethanol concentration after 54 h reached 140 g L− 1 with a yield of 0.49 g ethanol per g consumed sugar, which is 97% of the theoretical value. Sweet sorghum bagasse, obtained from juice squeezing, was pretreated by acetic acid to hydrolyze 80–90% of the contained hemicelluloses. Using this hydrolysate as raw material (total sugar 55 g L− 1), 19.21 g L− 1 total solvent (butanol 9.34 g, ethanol 2.5 g, and acetone 7.36 g) was produced by Clostridium acetobutylicum. The residual bagasse after pretreatment was extruded with PLA in a twin-screw extruder to produce a final product having a PLA: fiber ratio of 2:1, a tensile strength of 49.5 M and a flexible strength of 65 MPa. This product has potential use for applications where truly biodegradable materials are required. This strategy for sustainability is crucial for the industrialization of biofuels from sweet sorghum.

Item Type: Article
Author Affiliation: Beijing Key Lab of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
Subjects: Plant Production
Crop Improvement
Divisions: Sorghum
Depositing User: Mr. SanatKumar Behera
Date Deposited: 07 Jul 2012 07:27
Last Modified: 07 Jul 2012 07:28
Official URL: http://dx.doi.org/10.1016/j.biotechadv.2012.01.014
URI: http://eprints.icrisat.ac.in/id/eprint/6618

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