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Reusable ω-transaminase sol–gel catalyst for the preparation of amine enantiomers

Paper ID Volume ID Publish Year Pages File Format Full-Text
34544 45033 2013 7 PDF Available
Title
Reusable ω-transaminase sol–gel catalyst for the preparation of amine enantiomers
Abstract

•ω-Transaminase from Arthrobacter sp. was immobilized using sol–gel encapsulation.•Isopropyl alcohol was the best additive in encapsulation.•Washing of a maturated gel should be terminated by washing with isopropyl alcohol.•Long-term stability and reuse capacity of the catalyst preparation were good.•Optimized immobilizate works well in the kinetic resolution of primary amines.

Heterogeneous ω-transaminase sol–gel catalysts were prepared and characterized in terms of immobilization degree, loading capacity and catalytic behavior in the kinetic resolution of racemic 1-phenylethylamine (a model compound) with sodium pyruvate in phosphate buffer (pH 7.5). The catalyst obtained when ω-transaminase from Arthrobacter sp. was encapsulated from the aqueous solution of the enzyme, isopropyl alcohol and polyvinyl alcohol in the sol–gel matrices, consisting of the 1:5 mixture of tetramethoxysilane and methyltrialkoxysilane, proved to be optimal including the reuse and storage stabilities of the catalyst. The optimized immobilizate was shown to perform well in the kinetic resolution of four structurally different aromatic primary amines in aqueous DMSO (10, v/v-%). The enzyme preparation showed synthetic potential by enabling the catalyst reuse in five consecutive preparative scale kinetic resolutions using 100 mM 1-phenylethylamine in aqueous DMSO (10, v/v-%). It was typical to fresh catalyst preparations that the kinetic resolution tended to exceed 50% before the reaction stopped leaving the (S)-amine unreacted while thereafter in reuse the reactions stopped at 50% conversion as expectable to highly enantioselective reactions.

Keywords
Kinetic resolution; Amine enantiomers; ω-Transaminase from Arthrobacter sp.; Enzyme immobilization; Sol–gel entrapment; Enzymatic stability enhancement
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Reusable ω-transaminase sol–gel catalyst for the preparation of amine enantiomers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 48, Issue 10, October 2013, Pages 1488–1494
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