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Biocatalytic amide reduction using Clostridium sporogenes
Olutosin Dipeolu1, John Gardiner, Gill Stephens
1School of Chemical Engineering and Analytical Science, University of Manchester, P.O. Box 88, M60 1QD, Manchester, UK.
Biotechnology Letters
|November 30, 2005
Summary
Clostridium sporogenes efficiently converts benzamide to benzylamine using hydrogen as an electron donor. This enzymatic biotransformation offers a promising route for benzylamine production.
Area of Science:
- Microbiology
- Biocatalysis
- Enzymology
Background:
- Benzamide is a chemical compound with various applications.
- Enzymatic reduction of amides is a challenging but valuable biotransformation.
- Clostridium species are known for their diverse metabolic capabilities.
Purpose of the Study:
- To investigate the potential of Clostridium sporogenes for benzamide reduction.
- To determine the optimal conditions for benzylamine production.
- To confirm the enzymatic nature of the amide reduction process.
Main Methods:
- Washed cells of Clostridium sporogenes were used as biocatalysts.
- Benzamide was incubated with cells using H2 as the electron donor.
- Product formation and substrate hydrolysis were monitored over 24 hours.
- Boiled cells were used to confirm enzyme involvement.
Main Results:
- Clostridium sporogenes reduced benzamide to benzylamine with yields up to 73%.
- The biotransformation occurred at concentrations up to 20 mM benzamide.
- Hydrogen served as an effective electron donor.
- Product formation showed complex kinetics with an initial lag phase.
- Minimal substrate hydrolysis was observed (benzoic acid yield ≤ 9%).
- Inactivation of cells by boiling abolished the reduction activity.
Conclusions:
- Clostridium sporogenes possesses enzymatic machinery for efficient benzamide reduction to benzylamine.
- The process is enzyme-catalyzed and can be driven by hydrogen.
- This biocatalytic approach offers a selective method for benzylamine synthesis.
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