Biotechnology Techniques

, Volume 3, Issue 5, pp 333–338 | Cite as

The activity of PEG-modified chymotrypsin in aqueous and organic media

  • Carlo Pina
  • Douglas Clark
  • Harvey Blanch


Polyethylene glycol-modified chymotrypsin was prepared by activation of monomethoxypolyethylene glycols with phenylchloroformates and subsequent coupling with free enzyme. The modification was correlated with enzyme activity in aqueous solution and in organic solvents. The activity in aqueous solution was high (80% of that of non-modified enzyme), even at high degrees of modification. The modified protease was soluble in benzene and DMF and catalyzed transesterification in cyclohexane.


Enzyme Aqueous Solution Enzyme Activity Benzene Polyethylene 
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Copyright information

© Science & Technology Letters 1989

Authors and Affiliations

  • Carlo Pina
    • 2
  • Douglas Clark
    • 1
  • Harvey Blanch
    • 1
  1. 1.Department of Chemical EngineeringUniversity of California at BerkeleyBerkeley
  2. 2.Instituto G. DoneganiNovaraItaly

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