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Appl Environ Microbiol. 1984 January; 47(1): 7-11
Copyright © 1984, American Society for Microbiology. All Rights Reserved.

Microbial Transformation of Esters of Chlorinated Carboxylic Acids

D. F. Paris*, N. L. Wolfe and W. C. Steen

Environmental Research Laboratory, U.S. Environmental Protection Agency, Athens, Georgia 30613

ABSTRACT

Two groups of compounds were selected for microbial transformation studies. In the first group were carboxylic acid esters having a fixed aromatic moiety and an increasing length of the alkyl component. Ethyl esters of chlorine-substituted carboxylic acids were in the second group. Microorganisms from environmental waters and a pure culture of Pseudomonas putida U were used. The bacterial populations were monitored by plate counts, and disappearance of the parent compound was followed by gas-liquid chromatography as a function of time. The products of microbial hydrolysis were the respective carboxylic acids. Octanol-water partition coefficients (Kow) for the compounds were measured. These values spanned three orders of magnitude, whereas microbial transformation rate constants (kb) varied only 50-fold. The microbial rate constants of the carboxylic acid esters with a fixed aromatic moiety increased with an increasing length of alkyl substituents. The regression coefficient for the linear relationships between log kb and log Kow was high for group 1 compounds, indicating that these parameters correlated well. The regression coefficient for the linear relationships for group 2 compounds, however, was low, indicating that these parameters correlated poorly.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1984 January; 47(1): 7-11
Copyright © 1984, American Society for Microbiology. All Rights Reserved.





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Copyright © 1984 by the American Society for Microbiology. All rights reserved.