School of Natural Science, Hampshire College, Amherst, MA 01002, USA.
Environ Pollut. 2013 Mar;174:222-8. doi: 10.1016/j.envpol.2012.11.026. Epub 2012 Dec 28.
The tissue level uptake and spatial distribution of gold nanoparticles (AuNPs) in rice (Oryza sativa L.) roots and shoots under hydroponic conditions was investigated using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Rice plants were hydroponically exposed to positively, neutrally, and negatively charged AuNPs [AuNP1(+), AuNP2(0), AuNP3(-)] with a core diameter of 2 nm. Plants were exposed to AuNPs having 1.6 mg Au/L for 5 days or 0.14 mg Au/L for 3 months to elucidate how the surface charges of the nanoparticles affects their uptake into living plant tissues. The results demonstrate that terminal functional groups greatly affected the AuNP uptake into plant tissues. Au concentration determined by LA-ICP-MS in 5 day treated rice roots followed this order: AuNP1(+) > AuNP2(0) > AuNP3(-) but this order was reversed for rice shoots, indicating preferential translocation of AuNP3(-). Bioimages revealed distributions of mesophyll and vascular AuNP dependent on organ or AuNP concentration.
采用激光烧蚀-电感耦合等离子体质谱法(LA-ICP-MS)研究了水培条件下金纳米粒子(AuNPs)在水稻(Oryza sativa L.)根系和地上部分中的组织水平摄取和空间分布。将带正电、中性和带负电的金纳米粒子(AuNP1(+)、AuNP2(0)、AuNP3(-))[核心直径为 2nm]水培暴露于水稻中。将植物以 1.6mg Au/L 的 AuNP1(+)、AuNP2(0)、AuNP3(-)暴露 5 天,或以 0.14mg Au/L 的 AuNP1(+)、AuNP2(0)、AuNP3(-)暴露 3 个月,以阐明纳米粒子的表面电荷如何影响它们进入活体植物组织的摄取。结果表明,末端官能团极大地影响了 AuNP 进入植物组织的摄取。LA-ICP-MS 测定的 5 天处理的水稻根中的 Au 浓度顺序为:AuNP1(+) > AuNP2(0) > AuNP3(-),但对于水稻地上部分,该顺序被反转,表明 AuNP3(-)优先转运。生物图像显示了叶片和叶脉中 AuNP 的分布,这取决于器官或 AuNP 浓度。
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