Electrochemically assisted solid-phase micro-extraction using L-dopa imprinted conducting polymer electrode fibers: Structural aspects


Carla S. Schmiesing1, Rebecca A. LaRue2, Elwood E. Brooks2, Ahmed Galal3, Khalid R. Temsamani4, and Harry B. Mark Jr.2. (1) Chemistry, Otterbein College, SMC 10219, Westerville, OH 43081, (2) Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, OH 45221-0172, (3) Department of Chemistry, United Arab Emirates University, Faculty of Science, P.O. Box 17551, Al Ain, United Arab Emirates, (4) Department de Chimie, Universite Abdelmalek Essaadi, Tetouan, 93000, Morocco
Studies have been conducted to determine characteristics of conducting polymers incorporating sulfated b-cyclodextrin (SbCD) used for electrochemically assisted preconcentration and speciation via solid phase micro-extraction. In order to deduce structural aspects of these systems, the effect of ratio of monomer to SbCD was explored through NMR studies of liquid phase (pre-electropolymerization) and solid phase (post-polymerization). By using SbCD as counter ions in polypyrrole and polythiophene, the reversibility of the redox reactions for L-dopa can be altered, whereas these polymers without added SbCD exhibit different performance as electrodes for dopa analysis. Information regarding the position and orientation of the SbCD ring within the polymer matrix can be related to surface morphology by comparison of SEM micrographs of poly(3-methylthiophene), polypyrrole, and poly(3,4-ethylenedioxythiophene) when SbCD is included in the polymerization mixture. The final aim is to use imprinting for chiral separation of a racemic mixture by inclusion of L-dopa in the electropolymerization solution.

7:00 PM-9:00 PM, Sunday, March 23, 2003 Convention Center -- Hall G, Poster

Division of Analytical Chemistry
The 225th ACS National Meeting, New Orleans, LA, March 23-27, 2003