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Biosensors 2012, 2(2), 205-220; doi:10.3390/bios2020205

Detection of Cardiac Biomarkers Using Single Polyaniline Nanowire-Based Conductometric Biosensors

1
Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA
2
Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA
*
Author to whom correspondence should be addressed.
Received: 20 March 2012 / Revised: 20 April 2012 / Accepted: 25 April 2012 / Published: 14 May 2012
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Abstract

The detection of myoglobin (Myo), cardiac troponin I (cTnI), creatine kinase-MB (CK-MB), and b-type natriuretic peptide (BNP) plays a vital role in diagnosing cardiovascular diseases. Here we present single site-specific polyaniline (PANI) nanowire biosensors that can detect cardiac biomarkers such as Myo, cTnI, CK-MB, and BNP with ultra-high sensitivity and good specificity. Using single PANI nanowire-based biosensors integrated with microfluidic channels, very low concentrations of Myo (100 pg/mL), cTnI (250 fg/mL), CK-MB (150 fg/mL), and BNP (50 fg/mL) were detected. The single PANI nanowire-based biosensors displayed linear sensing profiles for concentrations ranging from hundreds (fg/mL) to tens (ng/mL). In addition, devices showed a fast (few minutes) response satisfying respective reference conditions for Myo, cTnI, CK-MB, and BNP diagnosis of heart failure and for determining the stage of the disease. This single PANI nanowire-based biosensor demonstrated superior biosensing reliability with the feasibility of label free detection and improved processing cost efficiency due to good biocompatibility of PANI to monoclonal antibodies (mAbs). Therefore, this development of single PANI nanowire-based biosensors can be applied to other biosensors for cancer or other diseases.
Keywords: myoglobin; cardiac troponin I; creatine kinase-MB; b-type natriuretic peptide; polyaniline; nanowire; conductometric biosensing myoglobin; cardiac troponin I; creatine kinase-MB; b-type natriuretic peptide; polyaniline; nanowire; conductometric biosensing
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Lee, I.; Luo, X.; Huang, J.; Cui, X.T.; Yun, M. Detection of Cardiac Biomarkers Using Single Polyaniline Nanowire-Based Conductometric Biosensors. Biosensors 2012, 2, 205-220.

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