A novel microfluidic biosensor based on an electrical detection system for alpha-fetoprotein
- Authors
- Maeng, Joon-Ho; Lee, Byung-Chul; Ko, Yong-Jun; Cho, Woong; Ahn, Yoomin; Cho, Nahm-Gyoo; Lee, Seoung-Hwan; Hwang, Seung Yong
- Issue Date
- Apr-2008
- Publisher
- Pergamon Press Ltd.
- Keywords
- immunoassay; microbiochip; immuno-gold silver staining; microfilter; microbead; alpha-fetoprotein
- Citation
- Biosensors and Bioelectronics, v.23, no.9, pp.1319 - 1325
- Indexed
- SCIE
SCOPUS
- Journal Title
- Biosensors and Bioelectronics
- Volume
- 23
- Number
- 9
- Start Page
- 1319
- End Page
- 1325
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/42590
- DOI
- 10.1016/j.bios.2007.11.019
- ISSN
- 0956-5663
- 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.
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Collections - COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY > ERICA 의약생명과학과 > 1. Journal Articles
- COLLEGE OF ENGINEERING SCIENCES > DEPARTMENT OF MECHANICAL ENGINEERING > 1. Journal Articles
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