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Conversion of unsaturated fatty acids by bacteria isolated from compost
T Kaneshiro1, T M Kuo, L K Nakamura
1Oil Chemical Reseach, National Center for Agricultural Utilization Research, Agricultural Research Service, U.S. Department of Agriculture, 1815 North University Street, Peoria, IL 61604, USA.
Current Microbiology
|March 9, 1999
Summary
Compost microorganisms transform unsaturated fatty acids (UFAs) into valuable compounds. This study identifies specific bacteria capable of UFA biotransformation through various biochemical mechanisms.
Area of Science:
- Microbiology
- Biochemistry
- Environmental Science
Background:
- Compost environments harbor diverse microorganisms with metabolic capabilities.
- Unsaturated fatty acids (UFAs) are abundant in organic matter and can be transformed by microbial action.
Purpose of the Study:
- To isolate and identify microorganisms from a compost mixture enriched with soybean oil that can transform unsaturated fatty acids (UFAs).
- To elucidate the specific biochemical mechanisms employed by these bacteria for UFA biotransformation.
Main Methods:
- Enrichment culture of compost microorganisms using soybean oil amended compost.
- Isolation and identification of bacterial species based on their ability to transform specific UFAs (oleic acid, 10-ketostearic acid, ricinoleic acid, linoleate).
- Characterization of transformation products and proposed biochemical pathways (decarboxylation, hydroxylation, hydroperoxidation).
Main Results:
- Sphingobacterium thalpophilum, Acinetobacter spp., and Enterobacter cloacae transformed oleic acid and 10-ketostearic acid into hydroxystearic acid and ketostearic acid.
- Enterobacter cloacae, Escherichia sp., and Pseudomonas aeruginosa converted ricinoleic acid into various homologous compounds and trihydroxyoctadecenoate.
- Several Enterobacter, Pseudomonas, and Serratia species demonstrated incomplete linoleate decarboxylation.
Conclusions:
- Compost bacteria, including Sphingobacterium, Acinetobacter, Enterobacter, Escherichia, Pseudomonas, and Serratia species, are capable of significant unsaturated fatty acid (UFA) biotransformation.
- These saprophytic, Gram-negative bacteria utilize decarboxylation, hydroxylation, and hydroperoxidation as key mechanisms for UFA decomposition.
- The identified microbial consortia and their metabolic pathways offer potential for biotechnological applications in fatty acid modification.