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Partition and purification of a thermostable xylanase produced by Paecilomyces thermophila in solid-state fermentation using aqueous two-phase systems

Paper ID Volume ID Publish Year Pages File Format Full-Text
35916 45114 2008 6 PDF Available
Title
Partition and purification of a thermostable xylanase produced by Paecilomyces thermophila in solid-state fermentation using aqueous two-phase systems
Abstract

In the present study, an aqueous two-phase system (ATPS) composed of polyethylene glycol (PEG) and ammonium sulphate ((NH4)2SO4) was used to purify a thermostable xylanase produced by the thermophilic fungus Paecilomyces thermophila J18 in solid-state fermentation (SSF). The effects of PEG, (NH4)2SO4, loading mass and pH on xylanase partition in ATPS were investigated. Xylanase partitioned in the top polymer-rich phase, while the remainder of proteins partitioned in the bottom salt-rich phase. The ATPS composition (w/w) of 12.5% PEG-4000, 25% (NH4)2SO4 and 50% enzyme solution at pH 7.2 was proved to be an excellent system for purification of xylanase in a single-step operation. SDS-PAGE analysis revealed that the purified xylanase was near homogeneity. A purification factor of 5.54 and a 98.7% enzyme yield were achieved in the top phase of this system. However, the xylanase produced in SSF was purified to homogeneity with a recovery yield of 34.5% by three steps. Therefore, ATPS provides an efficient and attractive method for purifying the xylanase in SSF.

Keywords
Aqueous two-phase system; Paecilomyces thermophila; Partition; Purification; Thermostable; Xylanase
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Partition and purification of a thermostable xylanase produced by Paecilomyces thermophila in solid-state fermentation using aqueous two-phase systems
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 43, Issue 1, January 2008, Pages 56–61
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