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Detoxification of hemicellulosic hydrolysates from extracted olive pomace by diananofiltration

Paper ID Volume ID Publish Year Pages File Format Full-Text
34839 45051 2014 8 PDF Available
Title
Detoxification of hemicellulosic hydrolysates from extracted olive pomace by diananofiltration
Abstract

•Diananofiltration experiments for the detoxification of olive pomace acid hydrolysate were made.•NF270 membrane was the membrane selected due to its high flux and low rejection for fermentation inhibitors.•Acetic, formic and levulinic acids, 5-hydroxymethylfurfural (HMF) and furfural were depleted from the original hydrolysate.•Detoxified hydrolysate enables the growth and xylitol production by the yeast Debaryomyces hansenii.

Xylitol can be obtained from the pentose-rich hemicellulosic fraction of agricultural residues, such as extracted olive pomace, by fermentation. Dilute acid hydrolysis of lignocellulosic materials, produces the release of potential inhibitory compounds mainly furan derivatives, aliphatic acids, and phenolic compounds. In order to study the potential on the increase of the hydrolysate fermentability, detoxification experiments based on diananofiltration membrane separation processes were made. Two membranes, NF270 and NF90, were firstly evaluated using hydrolysate model solutions under total recirculation mode, to identify the best membrane for the detoxification. NF270 was chosen to be used in the diananofiltration experiment as it showed the lowest rejection for toxic compounds and highest permeate flux. Diananofiltration experiments, for hydrolysate model solutions and hydrolysate liquor, showed that nanofiltration is able to deplete inhibitory compounds and to obtain solutions with higher xylose content. Conversely to non-detoxified hydrolysates, nanofiltration detoxified hydrolysates enabled yeast growth and xylitol production by the yeast Debaryomyces hansenii, clearly pointing out that detoxification is an absolute requirement for extracted olive pomace dilute acid hydrolysate bioconversion.

Keywords
Nanofiltration; Diafiltration; Hydrolysate detoxification; Fermentation inhibitors; Sustainable membrane processing
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 49, Issue 1, January 2014, Pages 173–180
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us