No Evidence for Cerium Dioxide Nanoparticle Translocation in Maize Plants
No Evidence for Cerium Dioxide Nanoparticle Translocation in Maize Plants
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DOI：
10.1021/es101685f
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发表时间：
2010-11-15
影响因子：
11.4
通讯作者：
Limbach, Ludwig K.
中科院分区：
文献类型：
--
作者：
Birbaum, Karin;Brogioli, Robert;Limbach, Ludwig K.
工程纳米颗粒的产量迅速增加，引发了人们对它们对环境的影响以及它们克服生物重要障碍的机动性的问题。纳米颗粒被发现可以跨越不同的哺乳动物屏障，这在术语易位下被概括为。本工作研究了纳米CeO2在玉米中的吸收和转运，玉米是主要的农作物之一。纳米颗粒被暴露为气雾剂或悬浮液。我们的研究表明，每克叶片中有50微克的Ce被吸附或结合到玉米叶片中。这个量不能通过洗涤步骤去除，也不取决于在黑暗和光照条件下研究的关闭或开放的气孔。然而，在培养气载颗粒物后的玉米植株时，没有发现移位到新长出的叶片中。电感耦合质谱仪的使用使检测下限低于1 ng Ce/g树叶。将植物暴露在灌溉水中具有良好特性的纳米颗粒悬浮液中，也没有检测到移位。这些发现可能表明，植物的生物屏障比哺乳动物的屏障更能抵抗纳米颗粒的移位。
The rapidly increasing production of engineered nanoparticles has raised questions regarding their environmental impact and their mobility to overcome biological important barriers. Nanoparticles were found to cross different mammalian barriers, which is summarized under the term translocation. The present work investigates the uptake and translocation of cerium dioxide nanoparticles into maize plants as one of the major agricultural crops. Nanoparticles were exposed either as aerosol or as suspension. Our study demonstrates that 50 mu g of cerium/g of leaves was either adsorbed or incorporated into maize leaves. This amount could not be removed by a washing step and did not depend on closed or open stomata investigated under dark and light exposure conditions. However, no translocation into newly grown leaves was found when cultivating the maize plants after airborne particle exposure. The use of inductively coupled mass spectrometer allowed detection limits of less than 1 ng of cerium/g of leaf. Exposure of plants to well-characterized nanoparticle suspensions in the irrigation water resulted also in no detectable translocation. These findings may indicate that the biological barriers of plants are more resistant against nanoparticle translocation than mammalian barriers.