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Microbial Degradation and Assimilation of n-Alkyl-Substituted Cycloparaffins¹

Department of Microbiology, North Carolina State University, Raleigh, North Carolina 27607

ABSTRACT

Studies were conducted on the oxidation and assimilation of n-alkyl-substituted cycloalkane substrates by several hydrocarbon-utilizing microorganisms. These microorganisms utilized heptadecylcyclohexane and dodecylcyclohexane as the sole source of carbon and energy. Neither methylcyclohexane nor ethylcyclohexane was utilized as a growth substrate by any organisms tested. Gas-liquid chromatographic analyses of fatty acids present in cells after growth on dodecylcyclohexane confirm direct incorporation of both alpha- and beta-oxidation products. Growth patterns of these organisms on n-alkyl-substituted cyclohexane fatty acids of varying chain lengths suggest a greater probability of ring cleavage when the side chain contains an odd number of carbons.

¹ Paper no. 4153 of the Journal Series of the North Carolina State University Agricultural Experiment Station.

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