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Applied and Environmental Microbiology, December 2000, p. 5393-5398, Vol. 66, No. 12
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Anaerobic Oxidation of n-Dodecane by an
Addition Reaction in a Sulfate-Reducing Bacterial Enrichment
Culture
Kevin G.
Kropp,
Irene A.
Davidova, and
Joseph M.
Suflita*
Institute for Energy and the Environment and
Department of Botany and Microbiology, University of Oklahoma,
Norman, Oklahoma 73019
Received 14 June 2000/Accepted 2 October 2000
We identified trace metabolites produced during the anaerobic
biodegradation of H26- and
D26-n-dodecane by an enrichment culture that
mineralizes these compounds in a sulfate-dependent fashion. The
metabolites are dodecylsuccinic acids that, in the case of the
perdeuterated substrate, retain all of the deuterium atoms. The
deuterium retention and the gas chromatography-mass spectrometry fragmentation patterns of the derivatized metabolites suggest that they
are formed by C---H or C---D addition across the double bond of
fumarate. As trimethylsilyl esters, two nearly coeluting metabolites of
equal abundance with nearly identical mass spectra were detected from
each of H26- and D26-dodecane, but as methyl esters, only a single metabolite peak was detected for each parent substrate. An authentic standard of protonated
n-dodecylsuccinic acid that was synthesized and derivatized
by the two methods had the same fragmentation patterns as the
metabolites of H26-dodecane. However, the standard gave
only a single peak for each ester type and gas chromatographic
retention times different from those of the derivatized metabolites.
This suggests that the succinyl moiety in the dodecylsuccinic acid
metabolites is attached not at the terminal methyl group of the alkane
but at a subterminal position. The detection of two equally abundant
trimethylsilyl-esterified metabolites in culture extracts suggests that
the analysis is resolving diastereomers which have the succinyl moiety
located at the same subterminal carbon in two different absolute
configurations. Alternatively, there may be more than one methylene
group in the alkane that undergoes the proposed fumarate addition
reaction, giving at least two structural isomers in equal amounts.
*
Corresponding author. Mailing address: Department of
Botany and Microbiology, Institute for Energy and the Environment,
University of Oklahoma, 770 Van Vleet Oval, Room 135, Norman, OK
73019-6131. Phone: (405) 325-5761. Fax: (405) 325-7541. E-mail:
jsuflita{at}ou.edu.
Applied and Environmental Microbiology, December 2000, p. 5393-5398, Vol. 66, No. 12
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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