Label-free detection of C-reactive protein using a carbon nanofiber based biosensor.

Label-free detection of C-reactive protein using a carbon nanofiber based biosensor.
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DOI:
10.1016/j.bios.2014.03.027
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发表时间:
2014-09-15
影响因子:
12.6
通讯作者:
Koehne, Jessica E.
Koehne, Jessica E.
中科院分区:
工程技术1区
文献类型:
--
作者:
Gupta, Rakesh K.;Periyakaruppan, Adaikkappan;Meyyappan, M.;Koehne, Jessica E.

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我们报告了使用基于碳纳米纤维的生物传感器平台对 C 反应蛋白(CRP)(一种心脏病的生物标志物)进行灵敏检测。使用等离子体增强化学气相沉积法生长垂直排列的碳纳米纤维,以制造 3 X 3 配置的纳米电极阵列。循环伏安法(CV)和电化学阻抗谱(EIS)用于CRP检测。 CV 响应显示,将抗 CRP 固定在电极上后,氧化还原电流减少了 25%,而从 EIS 中可以看出,电荷转移电阻增加了 30%。 CRP 结合在抗 CRP 固定化表面上,导致氧化还原电流进一步降低,电荷转移电阻增加,与 CRP 靶标浓度成正比。传感器的检测限约为 90 pM 或 11 ng/ml,处于临床相关范围内。使用非特异性肌红蛋白抗原的对照测试证实了本方法的特异性。
We report the sensitive detection of C-reactive protein (CRP), a biomarker for cardiac disease, using a carbon nanofiber based biosensor platform. Vertically aligned carbon nanofibers were grown using plasma enhanced chemical vapor deposition to fabricate nanoelectrode arrays in a 3 X 3 configuration. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used for the CRP detection. The CV responses show a 25 % reduction in redox current upon the immobilization of anti-CRP on the electrode where as a 30% increase in charge transfer resistance is seen from EIS. Further reduction in redox current and increase in charge transfer resistance result from binding of CRP on anti-CRP immobilized surface, proportional to the concentration of the CRP target. The detection limit of the sensor is found to be ~90 pM or ~11 ng/ml, which is in the clinically relevant range. Control tests using non-specific myoglobin antigen confirmed the specificity of the present approach.
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