Abstract
Actinobacterial strain Dietzia maris IEGM 55 T was used for studying biodegradability of dehydroabietic acid (C 20 H 28 O 2 , САS: 1740-19-8, abieta- 8,11,13-trien-18-oic acid, DAC) – a toxic tricyclic diterpenoid accumulated in wastewater of paper-and-pulp industry. A pronounced stability(MIC 390 mg/L) of Dietzia maris IEGM 55Т cells with respect to DAC was revealed. It was established that dietzia do not use DAC as an only source of carbon and energy, practically complete (97 %) destruction of 500 mg/L DAC being observed in 7 days under conditions of pre-cultivation of dietzia in the presence of n -hexadecane. The influence of DAC on the vital capacity and respiratory activity of dietzia was studied. The method of determination of antimicrobial activity was used to show that extracts of the prepared metabolites are not apparently toxic in comparison to that of the initial substrate. The data obtained expand the knowledge on the catalytic activity of actinobacteria and on their potential contribution to decontamination of natural ecosystems from ecotoxicants.
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