Silver Nanocubes as Electrochemical Labels for Bioassays.

Silver Nanocubes as Electrochemical Labels for Bioassays.
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DOI:
10.1021/acssensors.0c02377
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发表时间:
2021-03-26
期刊:
影响因子:
8.9
通讯作者:
Crooks RM
Crooks RM
中科院分区:
化学1区
文献类型:
--
作者:
Peng Y;Rabin C;Walgama CT;Pollok NE;Smith L;Richards I;Crooks RM

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在这里,我们报告了使用40 ± 4 nm的银纳米立方体(AgNC)作为电化学标记的生物测定。模型金属免疫分析结合了电交换(GE)和阳极溶出伏安法(ASV)。结果显示,与具有球形纳米颗粒(NP)的GE相比,通过简单地改变Ag标记的形状来实现检测下限,从而产生具有AgNC的改进的GE。具体地,在电生成的Au 3+和Ag标记之间的GE期间,在NP的表面上形成Au的薄壳。与球形AgNP相比,当GE在AgNC上进行时,该壳更多孔,因此当使用AgNC时发生更多的交换。ASV结果表明,当使用AgNCs时,Ag收集效率(AgCE%)增加高达~57%。当电化学系统完全优化时,检测限为0.1 pM AgNC,这比球形AgNP标记低一个数量级。
Here we report on the use of 40 ± 4 nm silver nanocubes (AgNCs) as electrochemical labels in bioassays. The model metalloimmunoassay combines galvanic exchange (GE) and anodic stripping voltammetry (ASV). The results show that a lower limit of detection is achieved by simply changing the shape of the Ag label yielding improved GE with AgNCs when compared to GE with spherical nanoparticles (NPs). Specifically, during GE between electrogenerated Au3+ and the Ag labels, a thin shell of Au forms on the surface of the NP. This shell is more porous when GE proceeds on AgNCs compared to spherical AgNPs, and therefore more exchange occurs when using AgNCs. ASV results show that the Ag collection efficiency (AgCE%) is increased by up to ~57% when using AgNCs. When the electrochemical system is fully optimized, the limit of detection is 0.1 pM AgNCs, which is an order of magnitude lower than that for spherical AgNP labels.
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