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RESEARCH ARTICLE  [Accepted]
Effects of titanium oxide nanoparticles on Oryzias latipes embryos and sac-fry under different irradiation conditions
Sun-Hwa Nam, Yu-Jin Shin, and Youn-Joo An
Department of Environmental Health Science, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
Corresponding Author: Youn-Joo An ,Tel: +82-2-2049-6090, Fax: +82-2-2201-6295, Email: : anyjoo@konkuk.ac.kr
Received: May 4, 2017;  Accepted: June 18, 2017.
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ABSTRACT
Some phototoxicity of titanium dioxide nanoparticles (TiO2 NPs) has been reported in recent years in studies with fish embryos or larvae. However, it is necessary to focus on the potential effects of embryonic exposure due to irreversible abnormalities and mortalities observed in sac-fry, and to expand various fish embryos to generate multiple test species. The aim of this study was to evaluate the effects of TiO2 NPs under different irradiation conditions in exposed Oryzias latipes (O. latipes) at the embryonic and sac-fry stages. The effects of different irradiation conditions were observed using UV and visible light, and the corresponding effects were monitored by determining cumulative mortality and abnormality. O. latipes were exposed for 8 days to 0, 1, 5, 10, or 50 mg/L TiO2 NPs under UV (4818.86 mW/m2 at the bottom of clear vials) or visible light, after which the embryos were transferred to NP-free embryo-rearing solution until day 16. Abnormalities of embryos and sac-fry increased at high TiO2 NP concentrations under UV irradiation, compared to control samples treated with visible light or UV irradiation alone. This work provides information regarding the phototoxicity of TiO2 NPs using O. latipes at the embryonic and sac-fry stages.
Keywords: Fish embryo | Oryzias latipes | Phototoxicity | TiO2 NPs | UV irradiation
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