Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: POSTERS Interfaces and Thin Films

CPP 28.8: Poster

Mittwoch, 25. März 2009, 17:00–19:00, P3

Voltage-dependent uptake of L-glutamate by polypyrrole films analysed in situ with EQCM — •Kathrin Fuchs, Elizabeth von Hauff, and Jürgen Parisi — Energy- and Semiconductor Research Laboratory, Department of Physics, University of Oldenburg, Carl-von- Ossietzky-Strasse 9-11, D-26111 Oldenburg

L-glutamate is an important neurotransmitter in the human central nervous system. Molecular selective surfaces which can control the concentration of biomolecules such as glutamate could find a broad range of application in the fields of biology and medicine.

For this purpose, electropolymerized polypyrrole (PPy) films doped with glutamate were characterized as glutamate-selective surfaces for the uptake and release of L-glutamate via a variable potential. The films were deposited potentiostatically on gold electrodes and 5 MHz Au-coated AT-cut quartz crystals, respectively, in an aqueous solution containing 0.4 M pyrrole and 0.5 M sodium L-glutamate. After deposition PPy films were overoxidized potientodynamically in aqueous 0,1 M NaOH in order to create a complementary cavity for the recognition of L-glutamate molecules [1]. Subsequently, the efficiency of the PPy film for the uptake and release of L-, D-Glutamate and chlorine depending on the applied voltage was analysed in situ with an electrochemical quartz crystal microbalance (EQCM). Furthermore the morphology of the films were investigated with a scanning electron microscope.

[1] B. Deore, Z. Chen, and T. Nagaoka, Anal. Sci., 15, 827, 1999