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British Journal of Applied Science & Technology, ISSN: 2231-0843,Vol.: 4, Issue.: 12 (21-30 April)


“Protective” Effects of Titanium Dioxide Nano-particles on Daphnia magna Exposed to UV Radiation


Guillermo Galindo Reyes1* and Giuseppe Rafael Galindo Rodríguez2

1Faculty of Marine Sciences, Autonomous University of Sinaloa Paseo Claussen S/N, Mazatlan, Sinaloa, CP 82000, Mexico.
2Department of Wood Cellulose and Paper, University of Guadalajara, Guadalajara Jalisco, CP 45010, Mexico.

Article Information


(1) Mark Vimalan, Department of Physics, Syed Ammal Arts and Science College, India.


(1) Masoud Karimipour, Vali-E-Asr University of Rafsanjan, Iran.

(2) Anonymous.

(3) Zuoli He, University of Utah, USA.

(4) Sanjay V. Ingale, India.

(5) Anonymous.

Complete Peer review History: http://www.sciencedomain.org/review-history/3902


Aims: Titanium dioxide nano-particles (nano-TiO2) have been used in sunscreen creams to protect skin againstultra violet (UV) radiation; other applications are polarized glasses, wall paints, etc., however, the ecological risks when nano-TiO2 residues reach aquatic ecosystems is not well documented; therefore, the objective of this study is to give some insight on the attenuating effects of nano-TiO2 against UV radiation on Daphnia magna and the toxicity of nano-TiO2 on this organism.
Study Design: Exposing Daphnis to UV radiation in presence and absence of nano-TiO2.
Place and Duration of Study: Biotechnology Institute, CNR, Canada and Toxicology laboratory, Faculty of Marine Sciences, University of Sinaloa Mexico; between April and July 2012.
Methodology: Daphnis (adults and neonates) were exposed to UV light for varying periods in the absence and presence of nano-TiO2. After 48 h incubation, mortalities were recorded for each experiment. Similar experiments were performed using bulk TiO2 instead of nano-TiO2, to know if protective effect is related to particles size. Finally, to know if protective effect is outer (blocking UV radiation) or interior (by cellular processes), Daphnis were pre-treated with nano-TiO2, then exposed to UV radiation, and mortalities recorded.
Results: The mortalities were significantly lower in presence than in absence of nano-TiO2. Alsomortalities were significantly higher in bulk TiO2 than in nano-TiO2, indicating that nano-TiO2 has a protective effect against UV radiation on Daphnis. Also, results indicate that protective effect is exterior, by blocking of UV rather than cellular repair mechanisms (cellular processes). However, at 100mg/L nanoTiO2 concentration, 15% mortality was observed.
Conclusion: Nano-TiO2 is a nanomaterial blocking UV radiation; however if residues reach aquatic ecosystems, could be a risk (toxic) for aquatic organisms, because the highest concentration used in this work caused mortalities in Daphnia magna.

Keywords :

Nano–TiO2; UV radiation; Daphnia magna; aquatic ecosystem.

Full Article - PDF    Page 1858-1868 Article Metrics

DOI : 10.9734/BJAST/2014/8696

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