Fabrication of Disposable Sensors for Biomolecule Detection Using Hydrazine Electrocatalyst

Shiddiky, Muhammad J. A., Rahman, Md. Aminur, Cheol , Chang Seung and Shim, Yoon-Bo (2008) Fabrication of Disposable Sensors for Biomolecule Detection Using Hydrazine Electrocatalyst. Analytical Biochemistry, 379 2: 170-175. doi:10.1016/j.ab.2008.05.004


Author Shiddiky, Muhammad J. A.
Rahman, Md. Aminur
Cheol , Chang Seung
Shim, Yoon-Bo
Title Fabrication of Disposable Sensors for Biomolecule Detection Using Hydrazine Electrocatalyst
Journal name Analytical Biochemistry   Check publisher's open access policy
ISSN 0003-2697
Publication date 2008-05-07
Sub-type Article (original research)
DOI 10.1016/j.ab.2008.05.004
Volume 379
Issue 2
Start page 170
End page 175
Total pages 6
Editor William B. Jacoby
Place of publication United States
Publisher Academic Press
Language eng
Subject C1
Abstract We have developed electrochemical DNA and protein sensors on screen-printed electrodes based on the catalytic activity of hydrazine. The sensors use carboxylic acid-functionalized conductive polymer, poly- 5,20,50,20 0-terthiophene-30-carboxylic acid (polyTTCA) to make firm immobilization of dendrimer (DEN) through the covalent bond formation between the carboxylic acid groups of polymer and amine groups of dendrimer. The gold nanoparticles (AuNPs)were adsorbed on the remaining amine groups of dendrimer. The thiolated DNA probe or primary antibody was subsequently immobilized on the AuNP-covered dendrimer surfaces. Avidin-labeled hydrazine (Av–Hyd) was then immobilized on the sensor surfaces through the avidin–biotin interaction between the Av–Hyd unit and the biotinylated DNA or secondary antibody. The electrocatalytic reduction current of H2O2 was measured by differential pulse voltammetry. The detection signal was amplified by the polyTTCA/DEN assembly loaded with AuNPs (3.5 nm) onto which target analyte- linked Av–Hyd was adsorbed. Linear dynamic ranges for the electrocatalytic detection of DNA and human immunoglobulin G (IgG) extending from 50 fM to 7.5 nM and from 40 fg/ml to 2.5 ng/ml, respectively, were observed along with detection limits of approximately 30 fM and 25 fg/ml, respectively. The low detection limit of the disposable sensors offers good promise for practical DNA and protein detection
Keyword Ultrasensitive detection
DNA and protein
Screen-printed electrode
Hydrazine electrocatalyst
Conductive polymer
Q-Index Code C1
Q-Index Status Provisional Code

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Tue, 02 Nov 2010, 11:05:36 EST by Dr Muhammad J. A. Shiddiky on behalf of Aust Institute for Bioengineering & Nanotechnology