Biocatalysis pp 129-140 | Cite as

Immobilization of Rhodococcus AJ270 and Use of Entrapped Biocatalyst for the Production of Acrylic Acid

  • John Colby
  • David Snella
  • Gary W. Black


Rhodococcus AJ270 is adsorbed by Dowex 1 at 15.4 mg dry weight per g resin with maximum amidase specific activity observed at lower loadings. Bacteria form a monolayer on the resin surface, and adsorption is complete within 2 min AJ270 can be entrapped in agar and agarose gels (optimum loading: 20 mg dry weight bacteria per cm3 gel). Adsorption and entrapment improve amidase thermal stability 3-4 fold, and entrapment shifts the pH optimum from 8 to 7. Adsorbed and free bacteria show similar values for Km and Vmax, but entrapped bacteria have higher Km values. Compared with bacteria adsorbed to Dowex, the activity per cm3 of matrix of agar-entrapped AJ270 is eight-fold higher. In stirred-tank reactors, exposure to acrylic acid reduces the amidase activity of the biocatalyst in the hydrolysis of acrylamide. In column reactors, entrapped AJ270 suffers little reduction in amidase activity against 0.25 M acrylamide over 22 h continuous operation.


Acrylic Acid Anionic Exchange Resin Column Reactor Nitrile Hydratase Immobilize Biocatalyst 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Vienna 2000

Authors and Affiliations

  • John Colby
    • 1
  • David Snella
    • 1
  • Gary W. Black
    • 1
  1. 1.School of SciencesUniversity of SunderlandUK

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