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Beta Oxidation of Phenoxyalkanoic Acids in Soil¹

ABSTRACT

The 2,4-dichlorophenoxyalkanoic acids with aliphatic moieties ranging from butyric to undecanoic were metabolized by the soil microflora to acids of shorter chain length. Phenoxyalkanoic acids with an even number of carbons in the fatty acids consistently were converted to products with an even number of carbons while compounds with an odd number of carbons in the aliphatic moieties were converted to the corresponding 2,4-dichlorophenoxyvalerate, propionate, and ultimately 2,4-dichlorophenol as measured by gas chromatography. The results demonstrate a beta oxidation sequence in the degradation of these pesticides in soil.

¹ Contribution from the Departments of Entomology and Agronomy, New York State College of Agriculture, Cornell University, Ithaca, N. Y. Agronomy Paper No. 628.

² Chemical Analyst, Research Assistant and Associate Professors, respectively. The authors thank May and Baker, Ltd. for gifts of chemicals.

Received for publication July 31, 1963. Accepted for publication August 26, 1963.