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Updated: Feb 24, 2026
11:16
Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization
Published on: July 11, 2012
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Enhancing Enzyme Activity and Immobilization in Nanostructured Inorganic-Enzyme Complexes
Xuye Lang1, Lingling Zhu2, Yingning Gao1
1Department of Chemical and Environmental Engineering, University of California , Riverside 92521, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 17, 2017
Summary
Enzyme loading in copper phosphate nanocrystals depends on enzyme charge and synthesis conditions. Optimizing temperature and pH enhances enzyme immobilization for improved catalysis.
Area of Science:
- Biocatalysis
- Materials Science
- Nanotechnology
Background:
- Enzyme-inorganic hybrid complexes are effective for enzyme immobilization.
- Precipitation of phosphate nanocrystals with enzymes yields high surface-to-volume ratio particles with enhanced activity and stability.
Purpose of the Study:
- To understand the mechanism of enzyme loading in enzyme-Cu3(PO4)2·3H2O complexes.
- To identify correlations between particle synthesis conditions, enzyme properties, and enzyme loading.
Main Methods:
- Synthesized enzyme-Cu3(PO4)2·3H2O particles using various enzymes (HRP, AdhD, diaphorase, catalase, GOx, BSA) at different temperatures (4°C, 37°C) and pH (7.4, 8.0).
- Analyzed enzyme loading based on enzyme's predicted isoelectric point (pI) and overall charge at synthesis pH.
- Assessed the effect of enzyme loading on enzyme activity and particle nanostructure using horseradish peroxidase (HRP) as a model.
Main Results:
- Horseradish peroxidase (HRP) loading increased 4.2-fold at 37°C compared to 4°C and was further enhanced at pH 8.0.
- Proteins with lower pI values and negative charges showed higher loading at 4°C synthesis.
- Enzyme activity increased with enzyme loading, with minimal impact on particle nanostructure due to synthesis temperature.
Conclusions:
- Enzyme loading in enzyme-inorganic particles can be controlled by adjusting synthesis temperature and pH, correlating with the enzyme's net charge.
- Optimized enzyme immobilization enhances catalytic activity, opening possibilities for enzyme and multienzyme catalysis.
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