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Highly enantioselective oxidation of racemic phenyl-1,2-ethanediol to optically pure (R)-(−)-mandelic acid by a newly isolated Brevibacterium lutescens CCZU12-1
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Highly enantioselective oxidation of racemic phenyl-1,2-ethanediol to optically pure (R)-(−)-mandelic acid by a newly isolated Brevibacterium lutescens CCZU12-1
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Highly enantioselective oxidation of racemic phenyl-1,2-ethanediol to optically pure (R)-(−)-mandelic acid by a newly isolated Brevibacterium lutescens CCZU12-1
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Journal Article
Highly enantioselective oxidation of racemic phenyl-1,2-ethanediol to optically pure (R)-(−)-mandelic acid by a newly isolated Brevibacterium lutescens CCZU12-1
2013
Overview
Enantioselective oxidation of racemic phenyl-1,2-ethanediol into (
R
)-(−)-mandelic acid by a newly isolated
Brevibacterium lutescens
CCZU12-1 was demonstrated. It was found that optically active (
R
)-(−)-mandelic acid (
e.e.p
> 99.9 %) is produced leaving the other enantiomer (
S
)-(+)-phenyl-1,2-ethanediol intact. Using fed-batch method, a total of 172.9 mM (
R
)-(−)-mandelic acid accumulated in the reaction mixture after the seventh feed. Moreover, oxidation of phenyl-1,2-ethanediol using calcium alginate-entrapped resting cells was carried out in the aqueous system, and efficient biocatalyst recycling was achieved as a result of cell immobilization in calcium alginate, with a product-to-biocatalyst ratio of 27.94 g (
R
)-(−)-mandelic acid g
−1
dry cell weight cell after 16 cycles of repeated use.
Publisher
Springer Berlin Heidelberg,Springer,Springer Nature B.V
Subject
/ Analysis
/ Bacteria
/ Biomedical and Life Sciences
/ Biotechnological Products and Process Engineering
/ Brevibacterium - classification
/ Brevibacterium - isolation & purification
/ Calcium
/ Cells, Immobilized - metabolism
/ Enzymes
/ Ethylene Glycols - metabolism
/ feeds
/ Microbial Genetics and Genomics
/ Oxidation-reduction reaction
/ RNA, Ribosomal, 16S - genetics
/ Studies
