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Small bioactive molecules as dual functional co-dopants for conducting polymers.

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Biofunctionalizing neural electrode coatings with anti-inflammatory molecules like dexamethasone phosphate (DP) and valproic acid (VA) reduces inflammation. Co-doping PEDOT with DP and VA improves material properties and retains bioactivity for better neural interfaces.

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Polymer Chemistry

Background:

  • Biological responses to neural interfacing electrodes can be modulated by biofunctionalizing conducting polymer (CP) coatings.
  • Small bioactive molecules with anti-inflammatory properties offer a potential strategy for modulating these responses.

Purpose of the Study:

  • To investigate the use of small bioactive molecules, specifically dexamethasone phosphate (DP) and valproic acid (VA), as dopants for poly(ethylenedioxythiophene) (PEDOT) conducting polymers.
  • To explore the impact of DP and VA, individually and as a codoped system, on the material properties and bioactivity of PEDOT coatings.
  • To compare these novel doped systems with conventional p-toluenesulfonate (pTS) doped PEDOT.

Main Methods:

  • Electropolymerization of PEDOT using anionic DP and VA as dopants, both individually and in combination (codoping).
  • Characterization of electrical and mechanical properties of the doped PEDOT coatings.
  • Evaluation of the anti-inflammatory bioactivity using a whole-blood model, measuring levels of the pro-inflammatory cytokine TNF-α.

Main Results:

  • DP and VA doping reduced the electrical properties of PEDOT compared to PEDOT/pTS.
  • Codoping with both DP and VA significantly improved PEDOT electroactivity and attenuated mechanical friability compared to individual doping.
  • All DP and VA doped CP coatings demonstrated significant reduction in TNF-α levels in a whole-blood inflammation model, retaining bioactivity.

Conclusions:

  • Small charged bioactive molecules can effectively act as dopants for conducting polymers.
  • Codoping with ions of varied size and doping affinity offers a strategy to overcome limitations associated with large, bulky biomolecular dopants.
  • This approach holds promise for developing improved neural interfacing electrodes with enhanced biocompatibility and reduced inflammatory responses.