Biogenic Synthesis of Au Nanoparticles Using Vascular Plants
Biogenic Synthesis of Au Nanoparticles Using Vascular Plants
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DOI：
10.1021/ie101600m
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发表时间：
2010-12-15
影响因子：
4.2
通讯作者：
Harris, Andrew T.
中科院分区：
文献类型：
--
作者：
Bali, Roza;Harris, Andrew T.
研究了已知的金属植物芥菜（Brassica juncea）和唾液（Medic:ago唾液）从KAuCl4水溶液中积累和隔离金（Au）的能力，一旦被隔离，一些金属就会以纳米颗粒的形式储存在这两种植物的表皮、皮层和维管组织中，但主要位于木质部薄壁细胞中。唾液中的纳米颗粒大小在2 ~ 2 μ m之间，而唾液中的纳米颗粒大小在2 ~ 1 μ m之间，并且与位置有关，根部纳米颗粒在两种物种中具有相似的大小分布，而在地上组织中的分布则在唾液和唾液中有所不同。B juncea显示更广泛的粒子大小非盟(0)纳米粒子也形成体外接触后根系分泌物和水溶液中KAuCl4导致减少非盟(III)盟(0)最大的粒子的比例范围5 - 10 (B juncea)和10 - 20 nm (M唾液)增长的机制的非盟(0)纳米粒子使用活的植物,在体内和体外都符合Turkevich[黄金牛市1985,18(3),86 - 91年),谁提出Au(0)粒子的形成过程涉及晶体成核、生长和凝固的相互作用
The known metallophytes Brassica juncea (B juncea) and Medic:ago saliva (M saliva) were investigated for their ability to accumulate and sequester gold (Au) from aqueous solutions of KAuCl4 Once sequestered, some of the metal was stored as nanoparticles, throughout the epidermis, cortex, and vascular tissue for both species, but predominantly located in the xylem parenchyma cells Nanoparticle size distribution within the plant tissues was determined In general, particle sizes ranged between 2 nm to 2 mu m in B juncea and 2 nm to 1 mu m in M saliva and was location dependent, root located nanoparticles had similar size distributions in both species, whereas the distribution within above ground tissues differed between M saliva and B juncea, with B juncea showing a much broader range of particle sizes Au(0) nanoparticles were also formed ex vivo following contact between root exudates and an aqueous solution of KAuCl4 resulting in the reduction of Au(III) to Au(0) The largest proportion of particles was in the range 5-10 nm (B juncea) and 10-20 nm (M saliva) The mechanism of growth of Au(0) nanoparticles using live plants, both in vivo and ex vivo is consistent with Turkevich [Gold Bull 1985, 18 (3), 86-91], who suggested that the process of Au(0) particle formation involved the interplay of crystal nucleation, growth, and coagulation