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Abstract
Nanoparticles are increasingly used in paints and lacquers. Little is known of the toxicity of nanoparticles incorporated in complex matrices and released during different phases of the life cycle. DNA damaging activity and inflammogenicity of sanding dust sampled during standardised sanding of boards painted with paints with and without nanoparticles were determined 24 h after intratracheal instillation of a single dose of 54 μg in mice. Dusts from nanoparticle-containing paints and lacquers did not generate pulmonary inflammation or oxidative stress. Sanding dust from both the nanoparticle-containing and the conventional lacquer and the outdoor acrylic-based reference paint increased the level of DNA strand breaks in bronchoalveolar fluid cells. In conclusion, addition of nanoparticles to paint or lacquers did not increase the potential of sanding dust for causing inflammation, oxidative stress or DNA damage, suggesting that the paint/lacquer matrix is more important as determinant of DNA damage than the nanomaterial.
Acknowledgements
The technical assistance from Lourdes Pedersen, Elzbieta Christiansen, Michael Guldbrandsen, Signe H. Nielsen, Maria Hammer and Vivi Kofoed-Sørensen is gratefully acknowledged. The Danish Paint and Lacquer Organization and especially the following Danish paint companies kindly supplied the materials: Flügger, Beck & Jørgensen, Dyrup, Akzo Nobel and Boesens Fabrikker. The Danish Working Environment Research Fund supported the study (Nanokem, grant #20060068816). The experiments were approved by the Danish “Animal Experimental Inspectorate” and carried out following their guidelines for ethical conduct and care when using animals in research.
