Different toxicity mechanisms between bare and polymer-coated copper oxide nanoparticles in Lemna gibba

作者：Perreault Francois; Popovic Radovan; Dewez David^*

来源：Environmental Pollution, 2014, 185: 219-227.

DOI：10.1016/j.envpol.2013.10.027

• Copper oxide nanoparticle
• Lemna gibba
• Nanotoxicology
• Reactive oxygen species
• Polymer coating

In this report, we investigated how the presence of a polymer shell (poly(styrene-co-butyl acrylate) alters the toxicity of CuO NPs in Lemna gibba. Based on total Cu concentration, core-shell CuO NPs were 10 times more toxic than CuO NPs, inducing a 50% decrease of growth rate at 0.4 g l(-1) after 48-h of exposure while a concentration of 4.5 g l(-1) was required for CuO NPs for a similar effect. Toxicity of CuO NPs was mainly due to NPs solubilization in the media. Based on the accumulated copper content in the plants, core-shell CuO NPs induced 4 times more reactive oxygen species compared to CuO NPs and copper sulfate, indicating that the presence of the polymer shell changed the toxic effect induced in L gibba. This effect could not be attributed to the polymer alone and reveals that surface modification may change the nature of NPs toxicity.

• 出版日期2014-2