Fluoroquinolonas em amostras aquosas ambientais e em teleósteos : quantificação, avaliação de toxicidade e ensaios de biotransformação
Abstract
The presence of drugs in the environment is an important issue in environmental
risk assessment. The fluoroquinolones represent a class of compounds widely used
in human and veterinary medicine, and its apport in the environment is continuous
and lacking of monitoring. In this scope, it is important to evaluate the levels of
these compounds in the environment and their toxicological impact on aquatic
organisms. The present study discuss the development and validation of analytical
methods for direct injection of samples using liquid chromatography coupled to
mass spectrometry for multiresidual determination of fluoroquinolones in effluents of São Carlos – SP, and toxicity tests of ciprofloxacin (CIP) on fish. For monitoring of
effluent samples, six fluoroquinolones were evaluated: CIP, gemifloxacin, moxifloxacin, ofloxacin, enrofloxacin, and norfloxacin (NOR). In effluent samples from wastewater treatment plant, CIP and NOR were quantified at concentrations of 195 ng L-1 and 270 ng L-1, respectively. Toxicity studies of CIP in species of O. niloticus exposed to different concentrations (0.5, 1.0 and 5.0 μg L-1) for periods of 7 and 14 days were evaluated by enzymatic and non-enzymatic systems. The biochemical assays demonstrated that fishes were not able to perform the detoxification, which was evidenced by the severe damage in their cells, especially on the gills and liver of the fishes. In vitro studies were carried out in species of O. mykiss, evaluating the biotransformation and bioaccumulative potential of some drugs commonly used in fish farms, including fluoroquinolones. The results using this in vitro model corroborate to the understanding of similarities and differences among different species of fish, as well as the assessment of environmental impact due to these compounds present in the environment.