Stabilization of glucose oxidase with cyclodextrin-branched carboxymethylcellulose

Madyu Matos, Benjamin K. Simpson, Héctor L. Ramírez, Roberto Cao, Juan J. Torres-Labandeira, Karel Hernández

Research output: Indexed journal article Articlepeer-review

4 Citations (Scopus)

Abstract

We present a methodology for improving some enzymatic characteristics of glucose oxidase (GOx) (EC 1.1.3.4). The enzyme was chemically modified with a β-cyclodextrin-branched carboxymethylcellulose polymer (CMC-CD), using carbodiimide as coupling agent. The obtained neoglycoenzyme had 0.78 mol of polysaccharide per mol of GOx and retained 67% of its initial activity. Comparison of some characteristics of the modified and free enzymes showed a higher Km for derivatized GOx and better thermostability, which increased from 45 ° C to 51 ° C. In addition, derivatization of GOx with CMC-CD increased its resistance to inactivation at 45 ° C by 2.2-fold, protected the molecule against inactivation with the anionic surfactant sodium dodecylsulphate to the point that it retained 75% of its activity after an incubation of 3 h, and extended its pH tolerance toward alkaline pH (7.5). Covalent glycosidation of glucose oxidase with CD-branched carboxymethylcellulose polymer constitutes therefore an effective strategy for enhancing the stability of this enzyme.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
JournalBiotecnologia Aplicada
Volume29
Issue number1
Publication statusPublished - Jan 2012
Externally publishedYes

Keywords

  • Carboxymethylcellulose
  • Cyclodextrin
  • Enzyme stability
  • Glucose oxidase

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