Modification and characterization of cellulosic cotton fibers for efficient immobilization of urease

International Journal of Biological Macromolecules
M Monier, A M A El-Sokkary

Abstract

Cotton fibers were first grafted by polyacrylonitril in the presence of KMnO(4) and oxalic acid as a combined redox initiator. Moreover, modification of the grafted cotton fibers was done by changing the nitrile group (-CN) into hydrazidine group through the reaction with hydrazine hydrate, then the fibers were activated by glutaraldehyde to introduce free aldehyde groups which were able to react with amino groups of urease to form Schiff's base, and result in cotton fibers immobilized urease. The efficiency of the immobilization was evaluated by examining the relative enzymatic activity of enzyme before and after the immobilization of urease. The results showed that the optimum temperature of immobilized urease was 35°C, which was higher than that of the free enzyme (30°C), and the immobilized urease exhibited a higher relative activity than that of free urease over 35°C. The optimal pH for immobilized urease was 6.5, which was lower than that of the free urease (pH 7.0), and the immobilization resulted in stabilization of enzyme over a wider pH range. The kinetic constant value (K(m)) of immobilized urease was higher than that of the free urease. However, the thermal and operational stabilities of immobilized urease have been...Continue Reading

References

Nov 17, 2001·Biomacromolecules·U J KimT Kondo
Dec 12, 2001·Journal of Biotechnology·Keri L BachmeierSookie S Bang

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Citations

Sep 27, 2013·Applied Biochemistry and Biotechnology·Begüm AkdumanSinan Akgöl
Jan 3, 2016·International Journal of Biological Macromolecules·Sapana KumariN S Reddy
Feb 18, 2015·Materials Science & Engineering. C, Materials for Biological Applications·Rajendran RameshNumbi Ramudu Kamini
Apr 30, 2014·The Analyst·Radha S P MalonEmma P Córcoles
Jun 21, 2019·Preparative Biochemistry & Biotechnology·Gokay VardarMelda Altikatoglu Yapaoz
Aug 14, 2014·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Julie Credou, Thomas Berthelot
Jul 14, 2013·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Julie CredouThomas Berthelot
Jan 21, 2020·Biomaterials·Maaike K van GelderKarin G F Gerritsen
Jul 31, 2016·Carbohydrate Polymers·Emine Erdogan Ozseker, Alper Akkaya

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