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Use of micromolded carbon dual electrodes with a palladium decoupler for amperometric detection in microchip electrophoresis
Author(s) -
Mecker Laura C.,
Martin R. Scott
Publication year - 2006
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200600401
Subject(s) - electrode , microelectrode , amperometry , ascorbic acid , materials science , analytical chemistry (journal) , working electrode , capillary electrophoresis , palladium , electrophoresis , carbon fibers , chromatography , nanotechnology , chemistry , electrochemistry , composite number , biochemistry , food science , composite material , catalysis
The fabrication and evaluation of micromolded dual carbon ink electrodes and their integration with a fabricated palladium decoupler for use in microchip electrophoresis is described. As opposed to previous work involving carbon‐based dual electrodes with microchip electrophoresis, this approach results in electrodes that are amenable to mass production in a manner where the decoupler/electrode alignment is fixed and reproducible. In this work, electrode sizes and spacings were optimized to result in dual carbon electrodes that are 1 µm in height and separated by 100 µm. Fluorescence microscopy was used to investigate leakage around the electrode/channel interface as well as to investigate what effect the dual electrodes have on band broadening phenomena. The performance of the microelectrodes was demonstrated by the separation and selective dual electrode detection of neurotransmitters in the presence of ascorbic acid. It was also found that addition of SDS to the buffer system improved both the LODs and collection efficiencies. This approach, which is the first involving carbon‐based dual electrodes with an on‐chip palladium decoupler, will be useful for separating and detecting neurotransmitters that are either collected by in vivo sampling or released from cells on‐chip.