Laboratoire des Interactions Ecotoxicologie, Biodiversité, Ecosystèmes, Université Paul Verlaine-Metz, CNRS UMR 7146, Campus Bridoux, Avenue du Général Delestraint, 57070 Metz, France.
Environ Pollut. 2011 Oct;159(10):2515-22. doi: 10.1016/j.envpol.2011.06.020. Epub 2011 Jul 29.
Mineral sunscreen nanocomposites, based on a nano-TiO(2) core, coated with aluminium hydroxide and dimethicone films, were submitted to an artificial ageing process. The resulting Altered TiO(2) Nanocomposites (ATN) were then tested in the liquid phase on the plant model Vicia faba, which was exposed 48 h to three nominal concentrations: 5, 25 and 50 mg ATN/L. Plant growth, photosystem II maximum quantum yield, genotoxicity (micronucleus test) and phytochelatins levels showed no change compared to controls. Oxidative stress biomarkers remained unchanged in shoots while in roots, glutathione reductase activity decreased at 50 mg ATN/L and ascorbate peroxidase activity decreased for 5 and 25 mg ATN/L. Nevertheless, despite the weak response of biological endpoints, ICP-MS measurements revealed high Ti and Al concentrations in roots, and X-ray fluorescence micro-spectroscopy revealed titanium internalization in superficial root tissues. Eventual long-term effects on plants may occur.
基于纳米 TiO(2)核、涂覆有氢氧化铝和二甲基硅油薄膜的矿物防晒霜纳米复合材料，经人工老化处理。然后，将所得的改性 TiO(2)纳米复合材料（ATN）在植物模型 Vicia faba 的液相中进行测试，该模型在三个名义浓度下暴露 48 小时：5、25 和 50 mg ATN/L。与对照组相比，植物生长、光合作用 II 最大量子产量、遗传毒性（微核试验）和植物螯合肽水平没有变化。在芽中，氧化应激生物标志物保持不变，而在根中，谷胱甘肽还原酶活性在 50 mg ATN/L 时降低，5 和 25 mg ATN/L 时抗坏血酸过氧化物酶活性降低。然而，尽管生物终点的反应较弱，但 ICP-MS 测量显示根中 Ti 和 Al 的浓度较高，X 射线荧光微光谱显示钛在根的表层组织中的内化。植物可能会出现长期的影响。
