Dibenzofuran: Bakterielle Mineralisierung

The degradation of uniformly¹⁴C-labelled dibenzofuran (DBF) by the strainPseudomonas sp HH 69 and a consortium consisting of the DBF-degrading Pseudomonas strain NRM and an accompanying Nocardia-like strain NRH, was monitored in liquid-batch cultures and in different soil samples. Experiments involving the strain and a consortium in aereated liquid cultures (batch process) showed that DBF was utilized as a source of energy and carbon. Thereby, more than 65% of DBF is rapidly converted to CO₂, about 20% to biomass and only about 10% to slow-degrading intermediate metabolites, respectively. The same microorganisms also exhibited comparable degrees of degradation efficiency in various types of soils contaminated with DBF. For instance, DBF, uniformly distributed in sterile soil samples, in concentrations between 0.2 to 200 ppm, was converted to CO₂, within 10 days, to the extent of about 75% by the strainPseudomonas sp. HH 69.