Startseite Preparation of aqueous polyaniline-vesicle suspensions with class III peroxidases. Comparison between horseradish peroxidase isoenzyme C and soybean peroxidase
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Preparation of aqueous polyaniline-vesicle suspensions with class III peroxidases. Comparison between horseradish peroxidase isoenzyme C and soybean peroxidase

  • Katja Junker EMAIL logo , Ivan Gitsov , Nick Quade und Peter Walde
Veröffentlicht/Copyright: 3. Mai 2013
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Abstract

Aniline was polymerised enzymatically in aqueous solution at pH = 4.3 and 25°C in the presence of submicrometer-sized vesicles formed from sodium bis(2-ethylhexyl)sulphosuccinate (AOT). H2O2 served as oxidant and the enzyme used was either horseradish peroxidase isoenzyme C (HRPC) or soybean peroxidase (SBP), both being class III peroxidases. From previous studies with HRPC, it is known that stable vesicle suspensions containing the emeraldine salt form of polyaniline (PANI-ES) can be obtained within 1–2 days with a 90–95 % yield, provided that optimal reaction conditions are applied. Unfortunately, HRPC becomes inactivated during polymerisation. In the present study, a linear dendritic block copolymer was added to HRPC, resulting in higher operational enzyme stability; the stabilising effect, however, was too small to afford a substantial decrease in the required amount of enzyme. Moreover, replacing HRPC with SBP was of no advantage, although SBP is known to be more stable towards inactivation by H2O2 than HRPC. By contrast, SBP was found to be much slower in oxidising aniline, and complete inactivation of SBP occurred before all the aniline monomers were oxidised, leading to low yields and the formation of over-oxidised products. The same was observed for HRP isoenzyme A2. Reactions without vesicles indicated that peroxidase inactivation was probably caused by PANI-ES.

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Published Online: 2013-5-3
Published in Print: 2013-8-1

© 2013 Institute of Chemistry, Slovak Academy of Sciences

Artikel in diesem Heft

  1. Recent trends and progress in research into structure and properties of polyaniline and polypyrrole — Topical Issue
  2. Printing polyaniline for sensor applications
  3. Carbonised polyaniline and polypyrrole: towards advanced nitrogen-containing carbon materials
  4. Conducting polymer-silver composites
  5. Electrorheological response of polyaniline and its hybrids
  6. Effect of PPy/PEG conducting polymer film on electrochemical performance of LiFePO4 cathode material for Li-ion batteries
  7. Polyaniline micro-/nanostructures: morphology control and formation mechanism exploration
  8. Self-assembly of aniline oligomers and their induced polyaniline supra-molecular structures
  9. Self-organization of polyaniline during oxidative polymerization: formation of granular structure
  10. Influence of ethanol on the chain-ordering of carbonised polyaniline
  11. X-ray absorption spectroscopy of nanostructured polyanilines
  12. Effect of cations on polyaniline morphology
  13. Preparation of polyaniline in the presence of polymeric sulfonic acids mixtures: the role of intermolecular interactions between polyacids
  14. Chemical degradation of polyaniline by reaction with Fenton’s reagent — a spectroelectrochemical study
  15. Thin mesoporous polyaniline films manifesting a water-promoted photovoltaic effect
  16. Polyamide grafted with polypyrrole: formation, properties, and stability
  17. Effect of ionic liquid on polyaniline chemically synthesised under falling-pH conditions
  18. Polyaniline doped with poly(acrylamidomethylpropanesulphonic acid): electrochemical behaviour and conductive properties in neutral solutions
  19. Electrical transport properties of poly(aniline-co-p-phenylenediamine) and its composites with incorporated silver particles
  20. Bi-hybrid coatings: polyaniline-montmorillonite filler in organic-inorganic polymer matrix
  21. Preparation of aqueous polyaniline-vesicle suspensions with class III peroxidases. Comparison between horseradish peroxidase isoenzyme C and soybean peroxidase
  22. Preparation, characterisation, and dielectric properties of polypyrrole-clay composites
  23. Multi-wall carbon nanotubes with nitrogen-containing carbon coating
  24. Conducting poly(o-anisidine)-coated steel electrodes for supercapacitors
  25. Conducting polyaniline/multi-wall carbon nanotubes composite paints on low carbon steel for corrosion protection: electrochemical investigations
  26. Preparation of a miniaturised iodide ion selective sensor using polypyrrole and pencil lead: effect of double-coating, electropolymerisation time, and current density
  27. Role of polyaniline morphology in Pd particles dispersion. Hydrogenation of alkynes in the presence of Pd-polyaniline catalysts
  28. Nanostructured polyaniline-coated anode for improving microbial fuel cell power output
  29. Antibacterial properties of polyaniline-silver films
  30. Effect of compression pressure on mechanical and electrical properties of polyaniline pellets
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