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Int. J. Environ. Res. Public Health 2018, 15(3), 416; https://doi.org/10.3390/ijerph15030416

Biotoxicity of TiO2 Nanoparticles on Raphidocelis subcapitata Microalgae Exemplified by Membrane Deformation

Department of Environmental Engineering, Faculty of Engineering, Akdeniz University, Antalya 07058, Turkey
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Received: 23 January 2018 / Revised: 14 February 2018 / Accepted: 23 February 2018 / Published: 27 February 2018
(This article belongs to the Special Issue Nano-Bio Interactions: Nanomedicine and Nanotoxicology)
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Abstract

TiO2 nanoparticles (NPs), which are mainly used in consumer products (mostly cosmetics), have been found to cause ecotoxic effects in the aquatic environment. The green algae Raphidocelis subcapitata, as a representative of primary producers of the freshwater ecosystem, has been frequently used to study the effects of metal oxide NPs. An ecotoxicity study was conducted herein to investigate the effects of TiO2 NPs on survival and membrane deformation of algal cells. Five different concentrations of nano-TiO2 particles (1, 10, 50, 100 and 500 mg/L) were prepared in synthetic surface water samples with five different water quality characteristics (pH 6.4–8.4, hardness 10–320 mg CaCO3/L, ionic strength 0.2–8 mM, and alkalinity 10–245 mg CaCO3/L). Results showed a significant increase in the hydrodynamic diameter of NPs with respect to both NP concentrations and ionic content of the test system. A soft synthetic freshwater system at pH 7.3 ± 0.2 appeared to provide the most effective water type, with more than 95% algal mortality observed at 50, 100 and 500 mg/L NP concentrations. At high exposure concentrations, increased malondialdehyde formations were observed. Moreover, due to membrane deformation, TEM images correlated the uptake of the NPs. View Full-Text
Keywords: TiO2 nanoparticles; synthetic freshwater; membrane deformation; Raphidocelis subcapitata TiO2 nanoparticles; synthetic freshwater; membrane deformation; Raphidocelis subcapitata
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Ozkaleli, M.; Erdem, A. Biotoxicity of TiO2 Nanoparticles on Raphidocelis subcapitata Microalgae Exemplified by Membrane Deformation. Int. J. Environ. Res. Public Health 2018, 15, 416.

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