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Pharmaceutical wastewater being composite mixture of environmental pollutants may be associated with mutagenicity and genotoxicity

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Abstract

Pharmaceutical industries are amongst the foremost contributor to industrial waste. Ecological well-being is endangered owing to its facile discharge. In the present study, heavy metals and organic contaminants in waste water were characterized using atomic absorption spectrophotometer and GC-MS, respectively. Mutagenicity and genotoxic potential of pharmaceutical waste water were investigated through bacterial reverse mutation assay and in vitro comet assay, respectively. Ames test and comet assay of first sample were carried out at concentrations of 100, 50, 25, 12.5, 6.25 % v/v effluent with distilled water. Chromium (Cr), lead (Pb), arsenic (As), and cadmium (Cd) were found in high concentrations as compared to WHO- and EPA-recommended maximum limits. Arsenic was found to be the most abundant metal and its maximum concentration was 0.8 mg.L−1. GC-MS revealed the presence of lignocaine, digitoxin, trimethoprim, caffeine, and vitamin E in waste water. Dose-dependent decrease in mutagenic index was observed in both strains. Substantial increase in mutagenicity was observed for TA-100, when assay was done by incorporating an enzyme activation system, whereas a slight increase was detected for TA-102. In vitro comet assay of waste water exhibited decrease in damage index and percentage fragmentation with the increase in dilution of waste water. Tail length also decreased with an increase in the dilution factor of waste water. These findings suggest that pharmaceutical waste water being a mix of different heavy metals and organic contaminants may have a potent mutagenic and genotoxic effect on exposed living organisms.

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Acknowledgments

I am thankful to Dr. Imran Altaf for their kind support and supplying us with the strains of bacteria.

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Correspondence to Ali Sharif.

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This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

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Responsible editor: Philippe Garrigues

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Sharif, A., Ashraf, M., Anjum, A.A. et al. Pharmaceutical wastewater being composite mixture of environmental pollutants may be associated with mutagenicity and genotoxicity. Environ Sci Pollut Res 23, 2813–2820 (2016). https://doi.org/10.1007/s11356-015-5478-3

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  • DOI: https://doi.org/10.1007/s11356-015-5478-3

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