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Permeation of solutes through an electropolymerized ultrathin poly‐o‐phenylenediamine film used as an enzyme‐entrapping membrane
Author(s) -
Centonze Diego,
Malitesta Cosimino,
Palmisano Francesco,
Zambonin Pier Giorgio
Publication year - 1994
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140060511
Subject(s) - permeation , amperometry , chemistry , membrane , cyclic voltammetry , glassy carbon , polymer , biosensor , electrochemistry , voltammetry , conductive polymer , chemical engineering , inorganic chemistry , electrode , analytical chemistry (journal) , organic chemistry , biochemistry , engineering
Permeation of electroactive organic probes through an electroinactive and passivating poly‐o‐phenylenediamine (PPD) film electropolymerized on Pt and glassy carbon (GC) electrodes has been investigated by cyclic and rotating disk electrode (RDE) voltammetry. The access of solutes to the metal‐polymer interface appears mainly governed by specific chemical interactions, influencing partition, and diffusion phenomena, rather than by exclusion effects based on molecular size or charge. Potential cycling of the film induces fine modifications in the chemical/physical structure of the polymer, as evidenced by electron spectroscopy for chemical analysis (ESCA) measurements and by an enhanced permeation of certain solutes. The membrane is, however, stable in the pH and potential range usually employed in its application, that is, as an enzyme‐entrapping membrane in amperometric biosensors; because of membrane permselectivity, the electrochemical response of the most common electroactive interferents is deeply depressed.