Taro Urase's Laboratory

Biodegradation of pharmaceuticals by whole fungal culture Trametes versicolor

Ngoc Han Tran, Taro Urase, Osamu Kusakabe (2010): Biodegradation characteristics of selected pharmaceutical substances by whole fungal culture Trametes versicolor and its laccase, Journal of Water and Environment Technology, 8, 2, 125-140.

ABSTRACT;

The degradation of 10 selected pharmaceuticals by whole fungal culture Trametes versicolor, culture filtrates and commercial laccase preparation was conducted. Complete removal of diclofenac (DCF), naproxen (NPX), indomethacin (IDM), ibuprofen (IBP), and fenoprofen (FEP) and partial degradation of other selected PhACs were observed after 48 hours of incubation with the 7-day-old liquid fungal culture in the cases of both the presence and the absence of ABTS (2,2f-azino-bis(3-ethyl-benzothiazoline-6-sulfonic acid)) as a laccase-mediator. The catalytic activity of laccase in the degradation of selected PhACs was examined for cases of both crude and commercial extracellular laccase preparations. The results showed that laccase preferentially removed DCF, NPX and IDM among the target PhACs removed by the whole fungal culture. Intracellular enzymes may degrade other compounds. The removal of most selected PhACs was increased with the increase in laccase activity. The presence of redox mediators such as ABTS and HBT (1-hyroxybenzotriazole) promoted the degradation of selected PhACs, in which complete degradation of DCF, NPX and IDM was observed after 3 hours of incubation with laccase activity (2000 U/l) in the presence of ABTS/HBT. The degradation spectrum by laccase for ionic pharmaceuticals with nitrogen containing structure was quite different from that of the activated sludge process.

Keywords; Degradation, white-rot fungal laccase, pharmaceutically active compounds (PhACs).