Document Detail

Biocatalytic synthesis of (R)-(-)-mandelic acid from racemic mandelonitrile by cetyltrimethylammonium bromide-permeabilized cells of Alcaligenes faecalis ECU0401.
MedLine Citation:
PMID:  20411403     Owner:  NLM     Status:  MEDLINE    
The nitrilase from Alcaligenes faecalis ECU0401 belongs to the category of arylacetonitrilase, which could hydrolyze 2-chloromandelonitrile, 3,4-dimethoxyphenylacetonitrile, mandelonitrile, and phenylacetonitrile into the corresponding arylacetic acids. To overcome the permeability barrier and prepare whole cell biocatalysts with high activities, permeabilization of Alcaligenes faecalis ECU0401 in relation to nitrilase activity was optimized by using cetyltrimethylammonium bromide (CTAB) as permeabilizing agent. The nitrilase activity from Alcaligenes faecalis ECU0401 increased 4.5-fold when the cells were permeabilized with 0.3% (w/v) CTAB for 20 min at 25 degrees C and pH 6.5. Consequently, almost all the mandelonitrile was consumed and converted to (R)-(-)-mandelic acid with greater than 99.9% enantiomeric excess (e.e.) by the CTAB-permeabilized cells. The permeability barrier has been significantly reduced in the hydrolysis of mandelonitrile by using CTAB-permeabilized cells and a dynamic resolution was successfully achieved, giving a 100% theoretical yield of (R)-(-)-mandelic acid. Efficient biocatalyst recycling was achieved as a result of cell immobilization in calcium alginate, with a product-to-biocatalyst ratio of 3.82 g (R)-(-)-mandelic acid g(-1) dry cell weight (dcw) cell after 20 cycles of repeated use.
Yu-Cai He; Zhi-Jun Zhang; Jian-He Xu; You-Yan Liu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-04-22
Journal Detail:
Title:  Journal of industrial microbiology & biotechnology     Volume:  37     ISSN:  1476-5535     ISO Abbreviation:  J. Ind. Microbiol. Biotechnol.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-06-16     Completed Date:  2010-09-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9705544     Medline TA:  J Ind Microbiol Biotechnol     Country:  England    
Other Details:
Languages:  eng     Pagination:  741-50     Citation Subset:  IM    
Laboratory of Biocatalysis and Bioprocessing, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
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MeSH Terms
Acetonitriles / chemistry,  metabolism*
Alcaligenes faecalis / chemistry,  metabolism*
Cells, Immobilized / chemistry,  metabolism
Cetrimonium Compounds / chemistry
Mandelic Acids / chemistry,  metabolism*
Reg. No./Substance:
0/Acetonitriles; 0/Cetrimonium Compounds; 0/Mandelic Acids; 532-28-5/mandelonitrile; 6899-10-1/cetrimonium; 90-64-2/mandelic acid

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