Abstract
Resistant strains ofEscherichia coli were obtained by stepwise cultivation in media with increasing concentration of antimicrobially active 1-(methyldodecyl)dimethylamine oxide and 1-(methyldodecyl)trimethylammonium bromide. Adaptive changes were determined in the fatty-acid (FA) composition in an isolated lipopolysaccharide sample from the outer membrane of these strains. The composition of this FA mixture from adapted strains was compared with that of FA from a sensitive strain. The differences were found in level of palmitic, heptadecanoic, heptadecenoic, heptadecadienoic and nonadecenoic acids. In addition, the adapted strains differed from each other in the content of myristic, pentadecanoic, stearic and linoleic acids.
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Abbreviations
- AO:
-
amine oxide(s)
- FA:
-
fatty acid(s)
- FAME:
-
fatty acid methyl ester(s)
- MTB:
-
1-(methyldodecyl)trimethylammonium bromide
- LPS:
-
lipopolysaccharide(s)
- OM:
-
outer membrane
- QAS:
-
quaternary ammonium salt(s)
- MDO:
-
1-(methyldodecyl)dimethylamine oxide
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Dubničková, M., Řezanka, T. & Koščová, H. Adaptive changes in fatty acids ofE. coli strains exposed to a quaternary ammonium salt and an amine oxide. Folia Microbiol 51, 371–374 (2006). https://doi.org/10.1007/BF02931578
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DOI: https://doi.org/10.1007/BF02931578