Stability analysis of Bacillus stearothermophilus L1 lipase immobilized on surface-modified silica gels

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Abstract

This work aims to investigate the effects of surface properties of carriers, and immobilization methods on the stability of a lipase. Factors affecting the lipase stability were divided into the reaction-independent factors (RIFs) and the reaction-dependent factors (RDFs). RIFs include the reaction conditions such as pH and temperature, whereas substrate limitation and product inhibition are examples of RDFs. Oil hydrolysis reactions were conducted at pH 10 and 50°C using free and immobilized lipase, which was derived from Bacillus stearothermophilus L1. Surface-modified silica gels were used as a carrier material for enzyme immobilization. Hydrophilic and hydrophobic silica gels were made by polyethyleneimine coating and silanization, respectively. Covalently bound lipase was found to be more stable than the lipase immobilized by physical adsorption. The effects of RIFs on the enzyme activity were less for the lipase immobilized on the hydrophilic silica gels than for the lipase on the hydrophobic silica gels regardless of immobilization methods. However, the opposite trend was observed for the effects of RDFs. Our study shows that the hydrophilicity and the hydrophobicity of carrier surfaces should be optimized in order to maximize the stability of immobilized lipase.

Original languageEnglish
Pages (from-to)85-90
Number of pages6
JournalBiochemical Engineering Journal
Volume17
Issue number2
DOIs
Publication statusPublished - 2004 Jan 1

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Geobacillus stearothermophilus
Silica Gel
Lipases
Silica gel
Bacilli
Lipase
Immobilization
Hydrophobic and Hydrophilic Interactions
Enzyme immobilization
Polyethyleneimine
Surface Properties
Hydrophilicity
Enzyme activity
Enzymes
Hydrophobicity
Adsorption
Surface properties
Hydrolysis
Oils
Coatings

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Environmental Engineering
  • Biomedical Engineering

Cite this

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abstract = "This work aims to investigate the effects of surface properties of carriers, and immobilization methods on the stability of a lipase. Factors affecting the lipase stability were divided into the reaction-independent factors (RIFs) and the reaction-dependent factors (RDFs). RIFs include the reaction conditions such as pH and temperature, whereas substrate limitation and product inhibition are examples of RDFs. Oil hydrolysis reactions were conducted at pH 10 and 50°C using free and immobilized lipase, which was derived from Bacillus stearothermophilus L1. Surface-modified silica gels were used as a carrier material for enzyme immobilization. Hydrophilic and hydrophobic silica gels were made by polyethyleneimine coating and silanization, respectively. Covalently bound lipase was found to be more stable than the lipase immobilized by physical adsorption. The effects of RIFs on the enzyme activity were less for the lipase immobilized on the hydrophilic silica gels than for the lipase on the hydrophobic silica gels regardless of immobilization methods. However, the opposite trend was observed for the effects of RDFs. Our study shows that the hydrophilicity and the hydrophobicity of carrier surfaces should be optimized in order to maximize the stability of immobilized lipase.",
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AU - Jung, Joon Ki

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