Reference: Sasaki K, et al. (2014) Optimized membrane process to increase hemicellulosic ethanol production from pretreated rice straw by recombinant xylose-fermenting Saccharomyces cerevisiae. Bioresour Technol 169:380-386

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Abstract


Unlabelled: Oligomeric sugars in the liquid fraction of hot water-pretreated rice straw are more amenable to membrane process than monomeric sugars, as lower pressure is required. Following membrane process was employed: nanofiltration (NF) concentration → (dilution → NF concentration) × 2 times → enzymatic hydrolysis (EH) → ultrafiltration (UF) permeation [

Implication: NF for recovery of oligomeric sugars, dilution and NF for removal of low molecular weight fermentation inhibitors, UF for removal of high molecular weight fermentation inhibitors and recovery of monomeric sugars after EH]. This process provided the liquid fraction containing 111.4 g L(-1) of sugars, corresponding to 681.0mM as monomeric sugars, from the original liquid fraction (181.1mM monomeric sugars). Concentrations of low molecular weight fermentation inhibitors, acetic and formic acids, were decreased to 24% and 48%, respectively. Xylose-fermenting recombinant Saccharomyces cerevisiae produced 34.5 ± 2.2 g L(-1) ethanol from the 0.8 times liquid fraction (76% of theoretical yield).

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Sasaki K, Tsuge Y, Sasaki D, Hasunuma T, Sakamoto T, Sakihama Y, Ogino C, Kondo A
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