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Label-free Electrochemical Impedance Detection of Ovarian Cancer Markers CA-125 and CEA

Published online by Cambridge University Press:  31 January 2011

Allison M Whited ,
Kanwar V Singh ,
Raj Solanki  and
David R Evans
Allison M Whited
Affiliation:
allison.whited@gmail.com, Portland State University, Physics, Portland, Oregon, United States
Kanwar V Singh
Affiliation:
vikas@pdx.edu, Portland State University, Physics, Portland, Oregon, United States
Raj Solanki
Affiliation:
solanki@pdx.edu, Portland State University, Physics, Portland, Oregon, United States
David R Evans
Affiliation:
DEvans@sharplabs.com, Sharp Laboratories of America, Camas, Washington, United States
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Abstract

CA-125 and carcinoembryonic antigen (CEA) are two biomarkers present in blood that can indicate the presence of ovarian cancer. They can also be used, both in conjunction with each other and independently, to determine the effectiveness of the treatment being meted for the disease. A label-free multiplexed interdigitated electrode array (IDEA) immunosensor was developed to detect both CA-125 and CEA in buffer solution at levels typically seen in patients with ovarian cancer . Electrochemical impedance spectroscopy was used to measure the increase in impedance when a binding event occurred between the target antigen and its specific antibody that was anchored to the surface of an interdigitated electrode array. CA-125 was detected in concentrations as low as 10units/mL and as high as 80units/mL. CEA was detected in concentrations as low as 1pg/mL and as high as 10μg/mL.

Keywords

biologicalbiological synthesis (assembly)biological synthesis (chemical reaction)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1236: Symposium SS – Biosurfaces and Biointerfaces , 2009 , 1236-SS05-09
Copyright
Copyright © Materials Research Society 2010

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