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Sensors 2016, 16(7), 1071; doi:10.3390/s16071071

An Optically-Transparent Aptamer-Based Detection System for Colon Cancer Applications Using Gold Nanoparticles Electrodeposited on Indium Tin Oxide

1
Biologically Inspired Sensors and Actuators ( BioSA) Laboratory, Department of Electrical Engineering and Computer Science, Lassonde School of Engineering, York University, Toronto, ON M3J1P3, Canada
2
Department of Life Science Engineering, Faculty of New Sciences &Technologies, University of Tehran, Tehran 14395-1561, Iran
3
Department of Biotechnology and Pharmacy Engineering, Faculty of Chemical Engineering, University of Tehran, Tehran 4563-11155, Iran
4
Research Center of New Technologies in Life Science Engineering, University of Tehran, Tehran 1417-963891, Iran
*
Authors to whom correspondence should be addressed.
Academic Editor: Galina Nemova
Received: 24 April 2016 / Revised: 30 June 2016 / Accepted: 6 July 2016 / Published: 12 July 2016
(This article belongs to the Special Issue SPR, WGM & Nano-Sensors: Advantages and Prospects)
View Full-Text   |   Download PDF [2870 KB, uploaded 19 July 2016]   |  

Abstract

In this paper, a label-free aptamer based detection system (apta-DS) was investigated for detecting colon cancer cells. For this purpose, we employed an aptamer specific to colon cancer cells like HCT116 expressing carcinoembryonic antigen (CEA) on their surfaces. Capture aptamers were covalently immobilized on the surface of gold nanoparticles (GNPs) through self-assembly monolayer of 11-mercaptoundecanoic acid (11-MUA) activated with EDC (1-Ethyl-3-[3-dimethylaminopropyl]carbodiimide)/N-hydroxysuccinimide (NHS). The cyclic voltammetry (CV) and chronopotentiometry (CP) methods were used for electrodeposition of GNPs on the surface of indium tin oxide (ITO). In this work, the CV method was also used to demonstrate the conjugation of GNPs and aptamers and identify the cancer cell capturing events. Additionally, Field Emission Scanning Electron Microscopy (FE-SEM) confirmed the deposition of GNPs on ITO and the immobilization of aptamer on the apta-DS. The electrodeposited GNPs played the role of nanoprobes for cancer cell targeting without losing the optical transparency of the ITO substrate. A conventional optical microscope also verified the detection of captured cancer cells. Based on this study’s results relying on electrochemical and optical microscopic methods, the proposed apta-DS is reliable and high sensitive with a LOD equal to 6 cell/mL for colon cancer detection. View Full-Text
Keywords: apta-DS; Gold Nanoparticle (GNP); indium tin oxide (ITO); cyclic voltammetry (CV); colon cancer; chronopotentiometry (CP) apta-DS; Gold Nanoparticle (GNP); indium tin oxide (ITO); cyclic voltammetry (CV); colon cancer; chronopotentiometry (CP)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ahmadzadeh-Raji, M.; Ghafar-Zadeh, E.; Amoabediny, G. An Optically-Transparent Aptamer-Based Detection System for Colon Cancer Applications Using Gold Nanoparticles Electrodeposited on Indium Tin Oxide. Sensors 2016, 16, 1071.

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