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Cell attachment functionality of bioactive conducting polymers for neural interfaces

โœ Scribed by Rylie A. Green; Nigel H. Lovell; Laura A. Poole-Warren


Book ID
104003842
Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
707 KB
Volume
30
Category
Article
ISSN
0142-9612

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โœฆ Synopsis


Bioactive coatings for neural electrodes that are tailored for cell interactions have the potential to produce superior implants with improved charge transfer capabilities. In this study synthetically produced anionically modified laminin peptides DEDEDYFQRYLI and DCDPGYIGSR were used to dope poly(3,4-ethylenedioxythiophene) (PEDOT) electrodeposited on platinum (Pt) electrodes. Performance of peptide doped films was compared to conventional polymer PEDOT/paratoluene sulfonate (pTS) films using SEM, XPS, cyclic voltammetry, impedance spectroscopy, mechanical hardness and adherence. Bioactivity of incorporated peptides and their affect on cell growth was assessed using a PC12 neurite outgrowth assay. It was demonstrated that large peptide dopants produced softer PEDOT films with a minimal decrease in electrochemical stability, compared to the conventional dopant, pTS. Cell studies revealed that the YFQRYLI ligand retained neurite outgrowth bioactivity when DEDEDYFQRYLI was used as a dopant, but the effect was strongly dependant on initial cell attachment. Alternate peptide dopant, DCDPGYIGSR was found to impart superior cell attachment properties when compared to DEDE-DYFQRYLI, but attachment on both peptide doped polymers could be enhanced by coating with whole native laminin.


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