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Related Experiment Videos

A method to protect sensitive molecules from a light-induced polymerizing environment.

Bianca Baroli1, Venkatram Prasad Shastri, Robert Langer

  • 1Department of Chemical Engineering, Room E25-342, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA.

Journal of Pharmaceutical Sciences
|May 23, 2003
PubMed
Summary
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Protecting sensitive biomolecules during in situ polymerization is crucial for tissue engineering and drug delivery. This study developed a novel wet granulation method to shield enzymes, preserving over 94% activity, unlike unprotected enzymes which lost significant function.

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • In situ photopolymerization is vital for tissue engineering and drug delivery.
  • Light-induced polymerization can damage entrapped bioactive agents like enzymes.
  • Protecting sensitive molecules during polymerization is a significant challenge.

Purpose of the Study:

  • To develop and evaluate a method for protecting sensitive biomolecules from photopolymerization damage.
  • To assess the activity retention of enzymes protected using gelatin-based wet granulation.
  • To compare the efficacy of protected versus unprotected enzymes in a photocurable matrix.

Main Methods:

  • Gelatin-based wet granulation was used to encapsulate model enzymes (horseradish peroxidase, alpha-glucosidase).

Related Experiment Videos

  • Protected and unprotected enzymes were incorporated into polyethylene glycol dimethacrylate matrices.
  • Enzyme activity and recovery were measured after diffusion from polymerized matrices.
  • Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF) analyzed enzyme molecular weight changes.

    • Main Results:

    • Unprotected enzymes lost 10-66% activity within 24 hours of diffusion.
    • Protected enzymes retained over 94% activity, regardless of experimental conditions.
    • Activity loss in unprotected enzymes was attributed to the photopolymerizing environment.

    Conclusions:

    • Gelatin-based wet granulation effectively protects sensitive enzymes from photopolymerization-induced degradation.
    • This protection strategy significantly enhances enzyme stability and function in photocurable biomaterials.
    • The method holds promise for improving the utility of in situ polymerizing systems in biomedical applications.