Novas fases extratoras SPME baseadas na eletrodeposição de polímeros condutores

Chaves, Andrea R.; Queiroz, Maria Eugênia C.

Palavras-chave: Solid-phase microextraction, conductive polymers, electropolymerization.

Resumo: The techniques, solid phase microextraction (SPME) and gas chromatography, have been successfully applied to the extraction of volatile and semi-volatile drugs from biological samples. However, SPME applications to ionizable compounds have been limited, because of the neutral charge of commercial SPME coatings, which results in low phase/sample partition coefficient and poor analytes recoveries. Thus, the evaluation of new SPME extraction phases, more selective, stable and low cost has been requested. The interest in the use of conductive polymers as an SPME extraction phase is related to the different interactions of the analytes (hydrophobic, π – π, ion exchange and acid-base) with the multifunctional groups on this polymer. The polymerization procedure can be achieved by chemical oxidation or electropolymerization in aqueous solution or organic solvents. The electrochemical method has advantages such as, the polymer or a mixes of polymers can be directly deposited on a metal wire, different functional groups can be incorporated, polymerization can be electrochemically controlled by cyclic voltammetry. This work presents some practical aspects involved in the electropolimerization of conductive polymers (polypyrrole, polythiophene, polyaniline and polyphenylpyrrole) on metal wire to development of new SPME extraction phase for SPME/LC and SPME/CG analyses.

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