Immobilization and Stabilization of Xylanase by Multipoint Covalent Attachment on Agarose and on Chitosan Supports

Xylanases have important applications in industry. Immobilization and stabilization of enzymes may allow their reuse in many cycles of the reaction, decreasing the process costs. This work proposes the use of a rational approach to obtain immobilized commercial xylanase biocatalysts with optimized f...

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Veröffentlicht in:Applied biochemistry and biotechnology 2010-05, Vol.161 (1-8), p.455-467
Hauptverfasser: Manrich, Anny, Komesu, Andrea, Adriano, Wellington Sabino, Tardioli, Paulo Waldir, Giordano, Raquel Lima Camargo
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container_start_page 455
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creator Manrich, Anny
Komesu, Andrea
Adriano, Wellington Sabino
Tardioli, Paulo Waldir
Giordano, Raquel Lima Camargo
description Xylanases have important applications in industry. Immobilization and stabilization of enzymes may allow their reuse in many cycles of the reaction, decreasing the process costs. This work proposes the use of a rational approach to obtain immobilized commercial xylanase biocatalysts with optimized features. Xylanase NS50014 from Novozymes was characterized and immobilized on glyoxyl-agarose, agarose-glutaraldehyde, and agarose-amino-epoxy support and on differently activated chitosan supports: glutaraldehyde-chitosan, glyoxyl-chitosan, and epoxy-chitosan. Two different chitosan matrices were tested. The best chitosan derivative was epoxy-chitosan-xylanase, which presented 100% of immobilization yield and 64% of recovered activity. No significant increase on the thermal stability was observed for all the chitosan-enzyme derivatives. Immobilization on glyoxyl-agarose showed low yield immobilization and stabilization degrees of the obtained derivative. The low concentration of lysine groups in the enzyme molecule could explain these poor results. The protein was then chemically modified with ethylenediamine and immobilized on glyoxyl-agarose. The new enzyme derivatives were 40-fold more stable than the soluble, aminated, and dialyzed enzyme (70 °C, pH 7), with 100% of immobilization yield. Therefore, the increase of the number of amine groups in the enzyme surface was confirmed to be a good strategy to improve the properties of immobilized xylanase.
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The low concentration of lysine groups in the enzyme molecule could explain these poor results. The protein was then chemically modified with ethylenediamine and immobilized on glyoxyl-agarose. The new enzyme derivatives were 40-fold more stable than the soluble, aminated, and dialyzed enzyme (70 °C, pH 7), with 100% of immobilization yield. 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The low concentration of lysine groups in the enzyme molecule could explain these poor results. The protein was then chemically modified with ethylenediamine and immobilized on glyoxyl-agarose. The new enzyme derivatives were 40-fold more stable than the soluble, aminated, and dialyzed enzyme (70 °C, pH 7), with 100% of immobilization yield. 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subjects Animals
Biochemistry
Biological and medical sciences
Biotechnology
Catalysts
Chemical reactions
Chemistry
Chemistry and Materials Science
Chitosan - chemistry
Comparative studies
Endo-1,4-beta Xylanases - chemistry
Endo-1,4-beta Xylanases - metabolism
Enzyme Stability
Enzymes
Enzymes, Immobilized - chemistry
Enzymes, Immobilized - metabolism
Fundamental and applied biological sciences. Psychology
Gels - chemistry
General aspects
Hydrogen-Ion Concentration
Immobilization techniques
Methods. Procedures. Technologies
Sepharose - chemistry
Temperature
title Immobilization and Stabilization of Xylanase by Multipoint Covalent Attachment on Agarose and on Chitosan Supports
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