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Separation and purification of laccases from two different fungi using aqueous two-phase extraction

Paper ID Volume ID Publish Year Pages File Format Full-Text
34802 45048 2014 12 PDF Available
Title
Separation and purification of laccases from two different fungi using aqueous two-phase extraction
Abstract

•PEG 3000-PO4 ATPS used for laccase purification and separation.•Different influences investigated: tie lines, initial enzyme- and NaCl conc.•Two modes of operation: selective separation and total enzyme purification.

Selective purification still poses a challenge in the downstream processing of biomolecules such as proteins and especially enzymes. In this study a polyethylene glycol 3000 (PEG 3000)–phosphate aqueous two-phase system at 25 °C and pH 7 was successfully used for laccase purification and separation. Initially, the effect of phase forming components on enzyme activities in homogenous systems was studied. In the course of the extraction experiments tie lines, enzyme source, initial enzyme activities, phase ratio and sodium chloride concentrations were varied and their influence on the activity partitioning was determined. Partitioning results were validated using clear-native-PAGE and isoelectric focusing. Based on these results, the separation of laccases from Trametes versicolor and Pleurotus sapidus was investigated using the principle of superposition. Sodium chloride was used to adjust laccase partitioning in the applied aqueous two-phase system (ATPS). Finally, two modes of operation are proposed depending on the aim of the purification task. One mode with 0.133 g g−1 of PEG3000, 0.063 g g−1 of phosphate and without sodium chloride separates P. sapidus laccases from T. versicolor laccases with clearance factors of 5.23 and 6.45, respectively. The other mode of operation with 0.124 g g−1 of PEG3000, 0.063 g g−1 of phosphate and 0.013 g g−1 of sodium chloride enables a partitioning of both laccases into the bottom phase of the ATPS resulting in a purification factor of 2.74 and 96% activity recovery.

Keywords
Aqueous two-phase system; Laccase; Separation; Superposition; Enzyme activity
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Separation and purification of laccases from two different fungi using aqueous two-phase extraction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 49, Issue 2, February 2014, Pages 335–346
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