Magnetic-separable robust microbeads using a branched polymer for stable enzyme immobilization

Jinyang Chung, Ee Taek Hwang, Haemin Gang, Man Bock Gu

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Uniform magnetic separable robust microbeads using a branched polymer were successfully developed for stable enzyme immobilization. The changed morphology of the microbeads was shown by scanning electron microscopy (SEM) analysis. The aldehyde groups on the polymers and imine groups derived from the Schiff base reaction between the aldehyde and amine moiety were found as the evidence of these reactions based on Fourier transform infrared (FT-IR) spectroscopy. The amine groups of the enzyme react with the aldehyde groups on the glutaraldehyde polymer so that the stable conjugations are formed. The specific activity of the conjugated enzyme was found to be retained more than 50%, but the reaction rate constant, Km value was not changed, compared to the free enzyme. In addition, the enzyme conjugated in the microbeads was found to be highly stable for more than 50 days, pertaining over 60% of its initial activity, even after being reused more than 15 times repeatedly. Furthermore, the magnetic-driven controllability provided facile separable characters for the repeated recycling. It is expected that these microbeads can be utilized as a key tool for successful realization not only in enzymatic conversion processes but also in extended fields; bio-based sensors or analytical devices, bioprocessing, bioremediation, to name only a few of numerous areas.

Original languageEnglish
Pages (from-to)39-45
Number of pages7
JournalReactive and Functional Polymers
Issue number1
Publication statusPublished - 2013 Jan

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (MEST) (NRFC1ABA001-2010-0020501), and National Research Foundation of Korea Grant from the Korean Government (NRF-2010-220-D00019).

Copyright 2013 Elsevier B.V., All rights reserved.


  • Branched polymers
  • Enzyme conjugation
  • Magnetic separability
  • Micro-hydrogel

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • Biochemistry
  • General Chemical Engineering
  • Polymers and Plastics
  • Materials Chemistry


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