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Biodegradation 2000

Anaerobic utilization of essential oils by denitrifying bacteria.

Samo registrirani uporabniki lahko prevajajo članke
Prijava / prijava
Povezava se shrani v odložišče
J Harder
U Heyen
C Probian
S Foss

Ključne besede

Povzetek

Plant volatile organic compounds are a major carbon source in nature. We studied the degradability of these substances by anaerobic microorganisms in enrichment cultures with representative essential oils as organic substrates and nitrate as electron acceptor. Lemon and pine needle oil supported microbial growth in the presence of pure oil, whereas parsley seed, camphor, sage, fennel, and mint oil supported growth only when the essential oils were dissolved in an overlying phase of 2,2,4,4,6,8,8-heptamethylnonane. Thyme oil did not support denitrification. Analyses of the microbially degraded oils revealed the disappearance of monoterpenes, of several monoterpenoids, and of methoxy-propenyl-benzenes, including apiole and myristicin. Most-probable-number determinations for denitrifying communities in sewage sludge and forest soil yielded 10(6) to 10(7) monoterpene-utilizing cells ml(-1), representing 0.7 to 100% of the total cultivable nitrate-reducing microorganisms. The utilization of essential oils together with the common occurrence of this metabolic trait are indications for an environmentally important, but currently unexplored anaerobic turnover of plant volatile organic compounds in soil.

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