fulltext.study @t Gmail

Detoxification requirements for bioconversion of softwood dilute acid hydrolyzates to succinic acid

Paper ID Volume ID Publish Year Pages File Format Full-Text
17920 42705 2009 8 PDF Available
Title
Detoxification requirements for bioconversion of softwood dilute acid hydrolyzates to succinic acid
Abstract

In this work an Escherichia coli metabolically engineered to ferment lignocellulosic biomass sugars to succinic acid was tested for growth and fermentation of detoxified softwood dilute sulfuric acid hydrolyzates, and the minimum detoxification requirements were investigated with activated carbon and/or overliming treatments. Detoxified hydrolyzates supported fast growth and complete fermentation of all hydrolyzate sugars to succinate at yields comparable to pure sugar, while untreated hydrolyzates were unable to support either growth or fermentation. Activated carbon treatment was able to remove significantly more HMF and phenolics than overliming. However, in some cases, overliming treatment was capable of generating a fermentable hydrolyzate where activated carbon treatment was not. The implications of this are that in addition to the known organic inhibitors, the changes in the inorganic content and/or composition due to overliming are significant to the hydrolyzate toxicity. It was also found that any HMF remaining after detoxification was completely metabolized during aerobic cell growth on the hydrolyzates that were capable of supporting growth.

Keywords
Softwood hydrolyzate; Succinic acid; Detoxification; Lignocellulose Fermentation; Biomass
First Page Preview
Detoxification requirements for bioconversion of softwood dilute acid hydrolyzates to succinic acid
Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 44, Issue 5, 6 May 2009, Pages 309–316
Authors
, , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering