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Cross-linked esterase aggregates (CLEAs) using nanoparticles as immobilization matrix.

Nithyakalyani Doraiswamy1, Mahalakshmi Sarathi1, Gautam Pennathur1

  • 1a Center for Biotechnology , Anna University , Chennai , India.

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|February 23, 2019
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Summary
This summary is machine-generated.

This study enhanced acetylesterase enzyme activity and stability using Cross-Linked Enzyme Aggregates (CLEAs) supported by magnetite nanoparticles (MGNP-CLEAs). MGNP-CLEAs demonstrated superior performance and stability compared to free enzymes and other immobilized forms.

Keywords:
Acetylesterasecross-linked enzyme aggregatesenhanced stabilitygraphene oxideimmobilizationmagnetite nanoparticle

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Area of Science:

  • Biocatalysis
  • Enzyme Immobilization
  • Nanotechnology

Background:

  • Acetylesterase enzyme from Staphylococcus spp. exhibits potential for industrial applications.
  • Enzyme immobilization is crucial for enhancing catalytic activity and operational stability.
  • Cross-Linked Enzyme Aggregates (CLEAs) offer a promising immobilization strategy.

Purpose of the Study:

  • To enhance the catalytic activity and stability of Staphylococcus spp. acetylesterase.
  • To develop and optimize nanoparticle-supported Cross-Linked Enzyme Aggregates (CLEAs).
  • To compare the performance of immobilized enzymes with the free enzyme.

Main Methods:

  • Preparation of magnetite and graphene oxide nanoparticles.
  • Immobilization of acetylesterase as Cross-Linked Enzyme Aggregates (CLEAs) on nanoparticles (MGNP-CLEAs, GO-CLEAs).
  • Optimization of CLEA preparation parameters (ammonium sulfate precipitation, glutaraldehyde concentration, cross-linking time).
  • Characterization using Scanning Electron Microscopy (SEM) and Fourier Transform Infrared spectroscopy (FT-IR).

Main Results:

  • Optimal CLEA preparation involved 60% saturated ammonium sulfate and 100 mM glutaraldehyde for 4 hours at 30°C, yielding 99.8% activity recovery.
  • Immobilized acetylesterase retained optimal activity at pH 8.0 and 30°C, similar to the free enzyme.
  • MGNP-CLEAs exhibited significantly improved storage stability and reusability compared to free enzyme and other immobilized forms.
  • SEM confirmed type-I aggregates, and FT-IR verified successful enzyme immobilization.

Conclusions:

  • Magnetite nanoparticle-supported Cross-Linked Enzyme Aggregates (MGNP-CLEAs) represent a highly effective strategy for enhancing acetylesterase activity and stability.
  • The developed MGNP-CLEAs show superior operational performance, stability, and reusability, making them suitable for industrial biocatalysis.
  • Nanoparticle-supported CLEAs offer a robust platform for enzyme immobilization, broadening their applicability.