Silver nanocluster based sensitivity amplification of a quartz crystal microbalance gene sensor

Silver nanocluster based sensitivity amplification of a quartz crystal microbalance gene sensor
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基于银纳米簇的石英晶体微天平基因传感器的灵敏度放大

DOI:
10.1007/s00604-015-1728-9
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发表时间:
2016-02
期刊:
影响因子:
5.7
通讯作者:
Cai Jiye
Cai Jiye
中科院分区:
化学2区
文献类型:
--
作者:
Zhou Lin;Lu Peng;Zhu Mingyao;Li Baole;Yang Peihui;Cai Jiye

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该文章描述了一种石英晶体微天平 (QCM) 生物传感器,用于通过银纳米簇 (AgNC) 的 DNA 模板组装来测定核酸,这代表了一种有效信号放大的新方法。 QCM 用探针 DNA 进行修饰,以特异性捕获目标 DNA。然后,组装 DNA 模板 AgNC,通过附着在 DNA 骨架上的 Ag(I) 离子来增强 QCM 传感器的灵敏度,然后通过对苯二酚诱导 AgNC 的还原形成。 TEM 和 AFM 用于进一步确认 DNA 模板 AgNC 的形成。结果表明,使用这种放大模式时,QCM 传感器的频率响应高达 87 倍。在 0.6 至 130 nM 范围内,频率响应与 DNA 浓度之间存在线性关系,检测限为 0.1 nM。在我们看来,这种提高灵敏度的方案提供了一种简单且广泛适用的 DNA 传感工具。 图文摘要 开发了一种新型石英晶体微天平生物传感器,通过银纳米簇的 DNA 模板组装作为有效的信号放大器,用于高灵敏度和无标记的核酸检测。
The article describes a quartz crystal microbalance (QCM) biosensor for the determination of nucleic acids via a DNA-templated assembly of silver nanoclusters (AgNCs) which represents a novel way for efficient signal amplification. A QCM was modified with probe DNA to specifically capture target DNA. Then, DNA-templated AgNCs were assembled to enhance the sensitivity of the QCM sensor via Ag(I) ions attached to the DNA skeleton, this followed by hydroquinone-induced reductive formation of the AgNCs. TEM and AFM were used to further confirm the formation of DNA-templated AgNCs. The results showed that frequency response of QCM sensor is up to 87 times larger when using this mode of amplification. A linear relationship was obtained between the frequency response and DNA concentration over the 0.6 to 130 nM range, with a 0.1 nM detection limit. In our perception, this scheme for improved sensitivity provides a straightforward and widely applicable tool for sensing DNA.Graphical AbstractA novel quartz crystal microbalance biosensor was developed for highly sensitive and label-free detection of nucleic acid through DNA-templated assembly of silver nanoclusters as an efficient signal amplifier.
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