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Comparison of Separate Hydrolysis and Fermentation versus Simultaneous Saccharification and Fermentation of Pretreated Wheat Straw to Ethanol by Saccharomyces cerevisiae

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Ethanol production by Saccharomyces cerevisiae NRRL Y-2034 from wheat straw (WS) by separate hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation (SSF) was studied. The yield of glucose from dilute acid pretreated WS (86 g/liter) after enzymatic saccharification was 26.9±0.1 g/liter. The pretreated WS was biologically conditioned to remove inhibitors by growing Coniochaeta ligniaria NRRL 30616 aerobically in the liquid portion for 15 h. The yeast produced 13.2±0.2 g ethanol per liter in 94 h from non-detoxified WS hydrolyzate (WSH) at pH 5.5 and 37 °C. It produced 13.3±0.0 g ethanol per liter in 30 h from the biodetoxified WSH by SHF. In SSF experiments, the strain produced 13.0±0.7 g ethanol per liter in 72 h from the non-detoxified WS but took 48 h to produce 13.1±0.1 g ethanol per liter from biodetoxified WS. By comparison, SSF of washed solid residues yielded 12.6±0.4 g ethanol per liter in 43 h. SSF offered advantage over SHF in reducing the total time of conversion of pretreated WS to ethanol by 53–57%.
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Keywords: BIODETOXIFICATION OF FERMENTATION INHIBITORS; ETHANOL; SACCHAROMYCES CEREVISIAE; SEPARATE HYDROLYSIS AND FERMENTATION; SIMULTANEOUS SACCHARIFICATION AND FERMENTATION; WHEAT STRAW HYDROLYZATE

Document Type: Research Article

Publication date: 01 July 2013

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  • The goal of the creation of a biobased economy is challenging to agriculture, forestry, academia, government and industry. The extractable resources of the Earth are finite, regardless of the quibble over when they will be depleted. The economic, political and social demands for biobased chemicals, materials and energy are expected to radically transform the materials industries, particularly the plastics industry as well as the biofuel industry. These changes will be based on the principles of sustainability, eco-efficiency, industrial ecology, and green chemistry and engineering. In keeping with the growth of knowledge in this field, there is a strong need for a forum to share original research related to biobased materials and bioenergy. The Journal of Biobased Materials and Bioenergy (JBMB) has been created as an international peer-reviewed periodical to fulfill the need for communication in these research areas. This journal will encompass related research activities in all fields of science, engineering and the life sciences.
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