Journal
TALANTA
Volume 81, Issue 4-5, Pages 1250-1257Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2010.02.017
Keywords
Biosensors; Biochips; DNA hybridization; Electrochemical detection; Polypyrrole; Ferrocenyl groups
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A simple and highly sensitive electrochemical DNA sensor based on a ferrocene-functionalizecl polypyrrole has been prepared on a microelectrode array substrate for a multi-DNA detection chip format A copolymer formed with 1-(phthalimidylbutanoate)-1'-(N-(3-butylpyrrole)butanamide)ferrocene (Py-Fe-NHP) and pyrrole was electrocopolymerized on the gold surface of both macroelectrode and biochip formats DNA probes bearing an amino group were covalently grafted by substitution of NHP groups and the hybridization reaction was followed by monitoring the redox signal of the ferrocenyl group acting as the probe The integration of the polymers into chip format produces high-density arrays of individually addressable oligonucleotide microelectrodes Results show that reducing the size of the electrodes from a macroelectrode to the chip format allows a variation of the nucleation and the growth process during electropolymerization of modified pyrrole monomers These modifications enable an increase in Use sensitivity and selectivity of DNA hybridization (C) 2010 Elsevier B.V. All rights reserved
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