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Updated: Aug 13, 2026

Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization
Published on: July 11, 2012
Armored Enzyme-Nanohybrids and Their Catalytic Function Under Challenging Conditions
Omkar V Zore1, Rajeswari M Kasi1, Challa V Kumar1
1University of Connecticut, Storrs, CT, United States; Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, United States.
Researchers developed highly stable enzyme-polymer-graphene oxide biocatalysts. These novel hybrid materials maintain full enzymatic activity under harsh conditions, paving the way for advanced biofuel cells.
Area of Science:
- Biocatalysis and Nanomaterials Science
- Enzyme Engineering and Stabilization
- Green Chemistry and Sustainable Technologies
Background:
- Enzyme stability is crucial for practical applications, especially in biofuel cells and biobatteries.
- Protecting enzymes from denaturation under operational conditions remains a significant challenge.
- Graphene oxide (GO) offers a promising platform for enzyme immobilization due to its large surface area and functional groups.
Purpose of the Study:
- To synthesize and characterize highly stable bienzyme-polymer triads on graphene oxide.
- To enhance enzyme stability and functionality using a dual protection strategy.
- To explore the potential of these hybrid biocatalysts in energy production applications.
Main Methods:
- Covalent conjugation of enzymes (glucose oxidase and horseradish peroxidase) with polyacrylic acid (PAA) to form enzyme-polymer armor.
- Adsorption of PAA-armored enzymes onto layered graphene oxide (GO) nanosheets.
- Characterization using techniques including agarose gel electrophoresis, zeta potential, circular dichroism, and transmission electron microscopy.
Main Results:
- Successfully synthesized and characterized the enzyme-polymer-nanosheet hybrid biocatalyst (GOx-HRP-PAA/GO).
- The armored biocatalysts demonstrated full enzymatic activity and stability across a wide pH range (2.5-7.4) and at elevated temperatures (65°C).
- Significant retention of enzymatic activity was observed in the presence of chemical denaturants (4mM sodium dodecyl sulfate), unlike unprotected enzyme mixtures.
Conclusions:
- A novel and powerful approach combining enzyme conjugation with PAA and GO adsorption yields super-stable hybrid biocatalysts.
- These biocatalysts function effectively under harsh environmental conditions, overcoming limitations of traditional enzyme preparations.
- The developed method provides a general strategy for designing green, biocompatible, and biodegradable biocatalysts for biofuel cells and biobatteries.
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