Aerobic biodegradation of hopanes and other biomarkers by crude oil-degrading enrichment cultures. | Academic Article individual record
abstract

The degradation of petroleum biomarkers was examined using mixed cultures of microorganisms enriched from surface soils at four different hydrocarbon-contaminated sites. These cultures degraded C30 17alpha(H),21beta(H)-hopane and the C31-C34 extended hopanes in Bonny Light crude oil after 21 days of incubation at 30 degrees C. The C35 extended hopanes were conserved, and no 25-norhopanes were detected during the incubation. Denaturing gradient gel electrophoresis (DGGE) analysis of the enrichment cultures demonstrated distinct microbial community profiles. Additional studies with the LC culture demonstrated a consistent biomarker degradation pattern after growth on three crude oils: a Nigerian Bonny Light crude, a Venezuelan crude oil, and Alaskan North Slope 521. The onset of biomarker degradation was observed between days 14 and 21 but only at 30 degrees C and at oil concentrations below 6 mg/mL. The biomarker profiles following degradation by these enrichment cultures are similar to numerous field observations and may represent the dominant biodegradation pattern found in many hydrocarbon-contaminated aerobic surface environments.

author list (cited authors)
Frontera-Suau, R., Bost, F. D., McDonald, T. J., & Morris, P. J.
publication date
2002
keywords
  • Bacteria, Aerobic
  • Petroleum
  • Triterpenes
  • Biological Markers
  • Environmental Monitoring
  • Electrophoresis, Gel, Two-Dimensional
  • Biomarkers
  • Biodegradation, Environmental
citation count

49