Journal
BIOSENSORS & BIOELECTRONICS
Volume 25, Issue 11, Pages 2477-2482Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2010.04.013
Keywords
Prostate cancer; Conducting polymer; Organic electronics; Gold nanoparticle; Immunosensor
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Funding
- WCU Program [R32-2008-000-10124-0]
- Ministry of Education, Science and Technology
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We demonstrated a highly sensitive organic electrochemical transistor (OECT) based immunosensor with a low detection limit for prostate specific antigen/alpha 1-antichymotrypsin (PSA-ACT) complex. The poly(styrenesulfonate) doped poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) based OECT with secondary antibody conjugated gold nanoparticles (AuNPs) provided a detection limit of the PSA-ACT complex as low as 1 pg/ml, as well as improved sensitivity and a dynamic range, due to the role of AuNPs in the signal amplification. The sensor performances were particularly improved in the lower concentration range where the detection is clinically important for the preoperative diagnosis and screening of prostate cancer. This result shows that the OECT-based immunosensor can be used as a transducer platform acceptable to the point-of-care (POC) diagnostic systems and demonstrates adaptability of organic electronics to clinical applications. (C) 2010 Elsevier B.V. All rights reserved.
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