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A novel microfluidic biosensor based on an electrical detection system for alpha-fetoprotein

Title
A novel microfluidic biosensor based on an electrical detection system for alpha-fetoprotein
Author
안유민
Keywords
Immunoassay; Microbiochip; Immuno-gold silver staining; Microfilter; Microbead; Alpha-fetoprotein
Issue Date
2008-04
Publisher
ELSEVIER ADVANCED TECHNOLOGY
Citation
BIOSENSORS & BIOELECTRONICS, v. 23, No. 9, Page. 1319-1325
Abstract
Conventional immunoassays are labor intensive, expensive and time consuming and require large pieces of equipment for detection. Therefore, we have developed and characterized a novel immunoassay methodology comprised of microbeads and microbiochips. In this method, microbeads are used to filter and immobilize antibodies and an immuno-gold silver staining (IGSS) method is then used to amplify electrical signals that correspond to the bound antibodies. The chip used for this system is composed of an inexpensive and biocompatible polydimethylsiloxane (PDMS) layer over a Pyrex glass substrate that contains a platinum (Pt) microelectrode, which is used to detect the electrical signal in this system, the microelectrode is fabricated on the substrate and a microchannel and pillar-type microfilter is formed in the PDMS layer. A sandwich immunoassay approach was applied to detect alpha-fetoprotein (AFP), a cancer biomarker, using this system. The results of this study showed that the time required for a complete assay was reduced by 1 h and a detection limit as low as 1 ng/mL was attained when this system used, which indicates that similar bead-based electrical detection systems could be used for the diagnosis of many forms of cancer. (C) 2007 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0956566307004873https://repository.hanyang.ac.kr/handle/20.500.11754/80283
ISSN
0956-5663
DOI
10.1016/j.bios.2007.11.019
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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