Soybean hull peroxidase immobilization on macroporous glycidyl methacrylates with different surface characteristics

Bioprocess Biosyst Eng. 2014 May;37(5):799-804. doi: 10.1007/s00449-013-1050-z. Epub 2013 Sep 24.

Abstract

Soybean hull peroxidase (SHP, E.C. 1.11.1.7) was immobilized by a glutaraldehyde and periodate method onto series of macroporous copolymers of glycidyl methacrylate (GMA) and ethylene glycol dimethacrylate (EGDMA), poly(GMA-co-EGDMA) with various surface characteristics and pore size diameters ranging from 44 to 200 nm. Glutaraldehyde immobilization method and poly(GMA-co-EGDMA) named SGE 20/12 with pore sizes of 120 nm gave immobilized enzyme with highest specific activity of 25 U/g. Deactivation studies showed that immobilization increased stability of SHP and that surface characteristics of the used copolymer had a major influence on a stability of immobilized enzyme at high temperatures and in an organic solvent. The highest thermostability was obtained using the copolymer SGE 20/12 with pore size of 120 nm, while the highest stability in dioxane had SHP immobilized onto copolymer SGE 10/4 with pore size of 44 nm. Immobilized SHP showed a wider pH optimum as compared to the native enzyme especially at alkaline pH values and 3.2 times increased K m value for pyrogallol. After 6 cycles of repeated use in batch reactor, immobilized SHP retained 25 % of its original activity. Macroporous copolymers with different surface characteristics can be used for fine tuning of activity and stability of immobilized SHP to obtain a biocatalyst suitable for phenol oxidation or polymer synthesis in organic solvents.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Enzyme Stability
  • Enzymes, Immobilized / chemistry*
  • Epoxy Compounds / chemistry*
  • Glycine max / enzymology*
  • Hot Temperature
  • Methacrylates / chemistry*
  • Peroxidase / chemistry*
  • Plant Proteins / chemistry*
  • Surface Properties

Substances

  • Enzymes, Immobilized
  • Epoxy Compounds
  • Methacrylates
  • Plant Proteins
  • Peroxidase
  • glycidyl methacrylate