Oxidation of pharmaceutically active compounds by a ligninolytic fungal peroxidase |
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Authors: | Gemma Eibes Gianfranco Debernardi Gumersindo Feijoo M. Teresa Moreira Juan M. Lema |
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Affiliation: | 1.Department of Chemical Engineering, School of Engineering,University of Santiago de Compostela,Santiago de Compostela,Spain;2.School of Biochemical Engineering,Pontificia Universidad Católica de Valparaíso,Valparaiso,Chile |
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Abstract: | Pharmaceuticals are an important group of emerging pollutants with increasing interest due to their rising consumption and the evidence for ecotoxicological effects associated to trace amounts in aquatic environments. In this paper, we assessed the potential degradation of a series of pharmaceuticals: antibiotics (sulfamethoxazole), antidepressives (citalopram hydrobromide and fluoxetine hydrochloride), antiepileptics (carbamazepine), anti-inflammatory drugs (diclofenac and naproxen) and estrogen hormones (estrone, 17β-estradiol, 17α-ethinylestradiol) by means of a versatile peroxidase (VP) from the ligninolytic fungus Bjerkandera adusta. The effects of the reaction conditions: VP activity, organic acid concentration and H2O2 addition rate, on the kinetics of the VP based oxidation system were evaluated. Diclofenac and estrogens were completely degraded after only 5–25 min even with a very low VP activity (10 U l−1). High degradation percentages (80%) were achieved for sulfamethoxazole and naproxen. Low or undetectable removal yields were observed for citalopram (up to 18%), fluoxetine (lower than 10%) and carbamazepine (not degraded). |
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