tailieunhanh - Effect of nanosized TiO2 particles on the development of Xenopus laevis embryos
This paper reports the toxic properties of nano-TiO2 on 2 different early life stages of Xenopus laevis. Synthesis of nano-TiO2 particles was carried out by the hydrothermal method. | Turkish Journal of Biology Turk J Biol (2014) 38: 283-288 © TÜBİTAK doi: Research Article Effect of nanosized TiO2 particles on the development of Xenopus laevis embryos 1 1,2, 1,2 3 Ayşe BİRHANLI , Fatma Bilge EMRE *, Funda SAYILKAN , Abbas GÜNGÖRDÜ Department of Elementary Education, Faculty of Education, İnönü University, Malatya, Turkey 2 Scientific and Technological Research Center, Research and Development Laboratory for Advanced and Technological Materials, İnönü University, Malatya, Turkey 3 Department of Biology, Faculty of Arts and Sciences, İnönü University, Malatya, Turkey 1 Received: Accepted: Published Online: Printed: Abstract: This paper reports the toxic properties of nano-TiO2 on 2 different early life stages of Xenopus laevis. Synthesis of nano-TiO2 particles was carried out by the hydrothermal method. Characterization of nanoparticles was performed using spectral techniques including X-ray diffraction, scanning electron microscopy, and a particle-size analyzer. Embryos at the 8th stage and tadpoles at the 46th stage were exposed to 7 concentrations of nano-TiO2 in the range of 5 to 320 ppm. After 96 h of exposure, the mortality percentage of each exposure concentration was calculated and the activity of enzyme biomarkers acetylcholinesterase, carboxylesterase, glutathione S-transferase, glutathione reductase, lactate dehydrogenase, and aspartate aminotransferase were determined in living embryos and tadpoles. None of the tested concentrations of TiO2 caused statistically significant mortality or malformation (only for the embryo test) as compared to the control groups. Furthermore, we did not observe any significant changes in enzyme activities in tadpole samples from the 46th stage, although some minor changes not related to the concentrations were observed in embryos. Key words: TiO2, hydrothermal process, Xenopus laevis, .
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