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Updated: Jul 3, 2026
A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
Published on: September 10, 2014
Electrochemical impedance spectroscopy and surface plasmon resonance studies of DNA hybridization on gold/SiOx
Maël Manesse1, Valerie Stambouli, Rabah Boukherroub
1Laboratoire d'Electrochimie et de Physicochimie des Matériaux et des Interfaces (LEPMI), CNRS-INPG-UJF, 1130 rue de la piscine, BP 75, 38402 St. Martin d'Hères Cedex, France.
Abstract:
The use of Au/SiO(x) interfaces for the investigation of DNA hybridization using electrochemical impedance spectroscopy (EIS) and surface plasmon resonance (SPR) simultaneously is demonstrated. Standard glass chemistry was used to link single-stranded DNA (ss-DNA) on aldehyde-terminated Au/SiO(x) interfaces. The layer thickness and amount of grafted oligonucleotides (ODNs) were calculated from SPR on the basis of a multilayer system of glass/Ti/Au/SiO(x)/grafted molecule. Capacitance and resistance values of the modified interface before and after hybridization were calculated from EIS data using an equivalent circuit and allowed the affinity rate constant, K(A) = 4.07 x 10(5) M(-1), to be determined. The EIS results were comparable to those obtained by SPR hybridization kinetics recorded in parallel.
