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Lipase entrapment in protamine-induced bio-zirconia particles: Characterization and application to the resolution of (R,S)-1-phenylethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
17316 42659 2012 7 PDF Available
Title
Lipase entrapment in protamine-induced bio-zirconia particles: Characterization and application to the resolution of (R,S)-1-phenylethanol
Abstract

Lipase from Burkholderia cepacia was encapsulated inside zirconia particles by biomimetic mineralization of K2ZrF6 induced with protamine, a natural cationic protein. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR) were employed for the characterization of the novel immobilized lipase. SEM and TEM images showed that both the zirconia particles with and without lipase have good spherical structures with average particle sizes of 150 nm. Fluorescence microscopy demonstrated that the lipase was indeed encapsulated inside the zirconia particles. The maximum immobilization capacity of the zirconia particles was 0.15 units/mg under optimum immobilization conditions. Biochemical characterization showed that the encapsulated lipase could retain most of its initial activity. Compared with free lipase, the encapsulated lipase exhibited improved thermal, pH, and recycling stabilities. After 8 weeks of storage, no substantial loss in catalytic activity was observed for the encapsulated lipase. The conversion of the kinetic resolution of (R,S)-1-phenylethanol with vinyl acetate as acetyl donor catalyzed by zirconia-immobilized lipase reached 49.9% with higher ees of 99.9% under the following optimal conditions: octane as solvent, 0.1 M (R,S)-1-phenylethanol, 70 mg immobilized lipase, 180 rpm, 50 °C for 48 h. After 6 cycles (288 h), the conversion and ees were still 43% and 85%, respectively.

► Lipase was entrapped in zirconia particles by bio-mineralization of K2ZrF6. ► Zirconia particles with or without lipase owned good spherical structure of 150 nm. ► The entrapped lipase showed improved thermal, pH, recycling and storage stabilities. ► The resolution of (R,S)-1-phenylethanol could be catalyzed by the entrapped lipase. ► Entrapping enzyme in zirconia induced by protamine is good for enzyme immobilization.

Keywords
Zirconia-encapsulated lipase; Biomimetic mineralization; Kinetic resolution; (R,S)-1-phenylethanol
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Lipase entrapment in protamine-induced bio-zirconia particles: Characterization and application to the resolution of (R,S)-1-phenylethanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 51, Issue 1, 10 June 2012, Pages 40–46
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us