A microfluidic chip for electrochemical conversions in drug metabolism studies

Mathieu Odijk, A. Baumann, W. Lohmann, Floris Teunis Gerardus van den Brink, Wouter Olthuis, U. Karst, Albert van den Berg

    Research output: Contribution to journalArticleAcademicpeer-review

    51 Citations (Scopus)


    We have designed a microfluidic microreactor chip for electrochemical conversion of analytes, containing a palladium reference electrode and platinum working and counter electrodes. The counter electrode is placed in a separate side-channel on chip to prevent unwanted side-products appearing in the measured spectrograms. Using this chip, cyclic voltammograms are measured in volumes of 9.6 nL. Furthermore the conversion efficiency of ferricyanide is characterized using UV/vis-spectroscopy. We have obtained an on-line conversion of 97% using a flow rate of 1 mu L/min. We have used the microreactor chip to study the electrochemical metabolism pathway of amodiaquine using electrochemistry (EC)-liquid chromatography (LC)-mass spectrometry (MS). We have compared our results with measurements obtained with commercially available electrochemical flow-through cells. Using our chip it was possible to obtain similar results. Therefore, we have fabricated an electrochemical cell on-chip which is used successfully in EC-UV/vis and EC-LC-MS experiments.
    Original languageUndefined
    Article number10.1039/b822962g
    Pages (from-to)1687-1693
    Number of pages7
    JournalLab on a chip
    Issue number12
    Publication statusPublished - 2009


    • online electrochemistry
    • cell
    • chromatography/mass spectrometry
    • cou
    • ms
    • redox reaction
    • IR-68301
    • Electrospray mass spectrometry
    • Electrodes
    • Oxidation
    • ed onlin
    • METIS-264114
    • EWI-16441

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