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Journal of Sol-Gel Science and Technology

, Volume 38, Issue 2, pp 121–131 | Cite as

Alternative synthesis of poly(hydroxymethylsiloxane) for lipase immobilization and use of the adsorbates as esterification biocatalysts

  • J. Hetflejs
  • G. KuncovaEmail author
  • S. Sabata
  • V. Blechta
  • J. Brus
Article

Abstract

A medium molar mass poly(hydrogenomethyl- siloxane), Me3Si(O-SiHMe)nOSiMe3, (PHMS), has been used for preparing poly(hydroxymethylsiloxane) supports (PHOMS) for lipase immobilization. The procedure involved the conversion of PHMS to the corresponding poly(alkoxymethylsiloxanes). Me3Si(OSi(OR) Me/nOSiMe3 (PHMS), their alkaline hydrolysis to form poly(siloxanolates) which were then converted to PHOMS by neutralization. The effect of different catalysts and alcohols (methanol, ethanol, 2-propanol) on the course of poly(alkoxymethylsiloxanes) formation is reported. PHOMS supports were characterized by BET and Hg porosimetry, and the degree of their crosslinking was determined by solid-phase NMR. Fluorescence spectroscopy was used to assess surface polarity and determine lipase loading. The efficiency of lipase adsorbed on these supports was tested in the esterification of stearic acid with propanol in hexane. It was found that the activity of the adsorbates is controlled by their porosity. The addition of an inert addend (e.g. hydrotalcite) in the step of alkaline hydrolysis of poly(alkoxymethylsiloxanes) increases the adsorption efficiency of the supports as compared to PHOMS. The potential application of the biocatalysts, lipase-PHOMS adsorbates, was extended by their encapsulation into a RTV silicone rubber containing Si-substituted poly(imide) as a swelling modifier.

Keywords

Lipase Poly(hydroxymethylsiloxane) Esterification biocatalyst Organic-inorganic matrices Silicon rubber encapsulates 113C and 29Si NMR spectra 

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Copyright information

© Springer Science + Business Media, LLC 2006

Authors and Affiliations

  • J. Hetflejs
    • 1
  • G. Kuncova
    • 1
    Email author
  • S. Sabata
    • 1
  • V. Blechta
    • 1
  • J. Brus
    • 2
  1. 1.Institute of Chemical Process Fundamentals ASCRPraha 6-Suchdol, Rozvojova 135Czech Republic
  2. 2.Institute of Macromolecular Chemistry ASCRPraha 6Czech Republic

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