title: Amperometric quantification based on serial dilution microfluidic systems.
abstract: This paper describes a microfluidic device fabricated in poly(dimethylsiloxane) that was employed to perform amperometric quantifications using on-chip calibration curves and on-chip standard addition methods. This device integrated a network of Au electrodes within a microfluidic structure designed for automatic preparation of a series of solutions containing an electroactive molecule at a concentration linearly decreasing. This device was first characterized by fluorescence microscopy and then evaluated with a model electroactive molecule such as Fe(CN(6))(4-). Operating a quantification in this microfluidic parallel approach rather than in batch mode allows a reduced analysis time to be achieved. Moreover, the microfluidic approach is compatible with the on-chip calibration of sensors simultaneously to the analysis, therefore preventing problems due to sensor response deviation with time. When using the on-chip calibration and on-chip standard addition method, we reached concentration estimation better than 5%. We also demonstrated that compared to the calibration curve approach, the standard addition mode is less complex to operate. Indeed, in this case, it is not necessary to take into account flow rate discrepancies as in the calibration approach.
authors.affiliation: Institut des Nanotechnologies de Lyon, INL, CNRS UMR5270, Université de Lyon, Lyon, F-69003, France.
authors.forename: Khaled
authors.initials: K
authors.lastname: Stephan
authors.forename: Patrick
authors.initials: P
authors.lastname: Pittet
authors.forename: Monique
authors.initials: M
authors.lastname: Sigaud
authors.forename: Louis
authors.initials: L
authors.lastname: Renaud
authors.forename: Olivier
authors.initials: O
authors.lastname: Vittori
authors.forename: Pierre
authors.initials: P
authors.lastname: Morin
authors.forename: Naim
authors.initials: N
authors.lastname: Ouaini
authors.forename: Rosaria
authors.initials: R
authors.lastname: Ferrigno