Modification of platinum microelectrode with molecularly imprinted over-oxidized polypyrrole for dopamine measurement in rat striatum

Tien Chun Tsai, Huan Zhang Han, Ching Ching Cheng, Li Chia Chen, Hsien Chang Chang, Jia Jin Jason Chen

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

A highly sensitive and selective electrochemical microelectrode using the molecularly imprinted (MIP) electropolymer of over-oxidized polypyrrole (OPPy) was proposed for in vivo detection of dopamine (DA) which process is different from current approaches for in vitro DA detection using MIP-based macroelectrode. The proposed MIP electrosynthesized by our present method under a DA/pyrrole-monomer concentration ratio of 1 mM/10 mM yielded the best results for DA adsorption, reaching 2.6-fold that of similar microelectrodes without imprinting. Differential normal pulse voltammetry techniques was used to evaluate the DA-imprinted OPPy microelectrodes for demonstrating high selectivity for in vitro DA detection under conditions with various competitive electroactive molecules. The validity of the modified OPPy-MIP thin-film microelectrodes was further verified with amperometric i-t measurements, which showed a lower DA levels of detection (10-100 nM) and the low detection limit of 4.5 nM with signal to noise ratio of 3. Good reproducibility with relative standard deviation of 5.45% and long-term stability within two weeks were also observed. The developed OPPy-MIP microelectrode has been successfully applied for acute in vivo DA detection in the striatum of anesthetized rats with 3,4-dihydroxy-l-phenylalanine (l-DOPA) administration, which can be used for future evaluation of novel therapeutic treatments in Parkinsonian rats.

Original languageEnglish
Pages (from-to)93-101
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume171-172
DOIs
Publication statusPublished - 2012 Aug 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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