Aerobic biodegradation of hopanes and norhopanes in Venezuelan crude oils | Academic Article individual record

The microbial degradation of two Venezuelan crude oils enriched in 25-norhopanes was examined after a 5-week aerobic incubation using a microbial enrichment culture. Analysis of the oils using gas chromatography-mass spectrometry revealed degradation of the C28 tricyclic terpane, the C29-C34 17α(H), 21β(H)-hopanes, and the C29 17α(H), 21β(H)-25-norhopane. The C35 17α(H), 21β(H)-hopane and 18α(H)-oleanane were conserved. Further, the C28C-34 17α(H),21β(H)-25-norhopanes were degraded and no formation of 25-norhopanes was observed. Degradation caused preferential removal of the 22R versus the 22S isomer in both the extended hopanes and 25-norhopanes, implying that bacteria remove these compounds in aerobic environments. These data demonstrate 25-norhopane degradation on a time scale similar to that for other biomarkers. © 2001 Elsevier Science Ltd.

author list (cited authors)
Bost, F. D., Frontera-Suau, R., McDonald, T. J., Peters, K. E., & Morris, P. J.
publication date
Elsevier BV Publisher
published in
  • Hopane
  • 25-Norhopane
  • Venezuela
  • Crude Oil
  • Biodegradation
citation count