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Related Experiment Video

Updated: Jul 3, 2026

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Published on: April 3, 2014

Dramatically stabilized phosphotriesterase-polymers for nerve agent degradation.

K E LeJeune¹, A J Mesiano, S B Bower

¹Department of Chemical Engineering-Center for Biotechnology and Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.

Biotechnology and Bioengineering

|April 20, 1997

Summary

This summary is machine-generated.

Immobilized phosphotriesterase (EC 3.1.8.1) in polyurethane foam shows enhanced stability and retains high activity. This enzyme system can degrade large quantities of nerve agent, offering a promising solution for detoxification.

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Area of Science:

Biocatalysis
Enzyme immobilization
Polymer science

Background:

Phosphotriesterase (EC 3.1.8.1) is crucial for hydrolyzing organophosphates.
Enzyme immobilization enhances stability and reusability for industrial applications.
Developing robust enzyme systems for hazardous substance degradation is essential.

Purpose of the Study:

To immobilize phosphotriesterase within a polyurethane foam matrix.
To evaluate the stability, activity, and functional integrity of the immobilized enzyme.
To assess the potential of immobilized phosphotriesterase for nerve agent degradation.

Main Methods:

Enzyme immobilization via prepolymer synthesis within a polyurethane foam.
Assessment of enzyme specific activity post-immobilization.
Evaluation of storage and thermal stability, including net stabilization energy.
Testing protease resistance and functional effects of immobilization.
Investigating the stabilizing effect of dimethyl sulfoxide.

Main Results:

Immobilized phosphotriesterase retained over 50% of its specific activity.
Significant increases in storage and thermal stability were achieved (net stabilization energy = 12.5 kJ/mol).
The immobilized enzyme demonstrated protease resistance and no loss of function.
Dimethyl sulfoxide showed a stabilizing effect on the enzyme system.
A projection indicated 2.5 kg of immobilized enzyme could degrade 30,000 tons of nerve agent annually.

Conclusions:

Polyurethane foam immobilization is an effective strategy for enhancing phosphotriesterase stability and activity.
The immobilized enzyme system exhibits remarkable thermal and storage stability without premodification.
The enzyme's resistance to proteases and functional integrity are maintained.
Organic solvent interactions may further stabilize the enzyme.
Immobilized phosphotriesterase presents a potent solution for large-scale nerve agent detoxification.