Aptamer-based electrochemical biosensor for interferon gamma detection.

Aptamer-based electrochemical biosensor for interferon gamma detection.
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DOI:
10.1021/ac101409t
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发表时间:
2010-10-01
影响因子:
7.4
通讯作者:
Revzin, Alexander
Revzin, Alexander
中科院分区:
化学1区
文献类型:
--
作者:
Liu, Ying;Tuleouva, Nazgul;Ramanculov, Erlan;Revzin, Alexander

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在本文中,我们描述了一种基于电化学DNA适体的生物传感器的发展,用于检测IFN-γ。将含有IFN-γ结合适配体的DNA发夹硫化,与亚甲基蓝(MB)氧化还原标签结合,通过自组装固定在金电极上。IFN-γ的结合导致适配体发夹展开,将MB氧化还原分子推离电极,降低电子传递效率。氧化还原电流的变化用方波伏安法(SWV)量化,发现对IFN-γ浓度高度敏感。优化后的生物传感器的检出限为0.06 nM,线性响应扩展到10 nM。在血清蛋白过多的情况下,该适配体传感器对IFN-γ具有特异性。重要的是,通过破坏尿素缓冲液中的适配体- ifn -γ复合物,可以再生相同的适配体传感器,并可多次重复使用。与标准的三明治免疫测定不同,这里描述的适配体传感器允许直接检测IFN-γ结合,而不需要多次洗涤步骤和试剂。本文展示的一种简单灵敏的IFN-γ电化学生物传感器将在免疫学、癌症研究和传染病监测方面有未来的应用。
In this paper, we describe the development of an electrochemical DNA aptamer-based biosensor for detection of IFN-γ. A DNA hairpin containing IFN-γ-binding aptamer was thiolated, conjugated with Methylene Blue (MB) redox tag and immobilized on a gold electrode by self-assembly. Binding of IFN-γ caused the aptamer hairpin to unfold, pushing MB redox molecules away from the electrode and decreasing electron-transfer efficiency. The change in redox current was quantified using Square Wave Voltammetry (SWV) and was found to be highly sensitive to IFN-γ concentration. The limit of detection for optimized biosensor was 0.06 nM with linear response extending to 10 nM. This aptasensor was specific to IFN-γ in the presence of overabundant serum proteins. Importantly, the same aptasensor could be regenerated by disrupting aptamer-IFN-γ complex in urea buffer and re-used multiple times. Unlike standard sandwich immunoassays, the aptasensor described here allowed to detect IFN-γ binding directly without the need for multiple washing steps and reagents. An electrochemical biosensor for simple and sensitive detection of IFN-γ demonstrated in this paper will have future applications in immunology, cancer research and infectious disease monitoring.
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