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Surface functionalization of polymer substrates with hydroxyapatite using polymer-binding peptides.

Kazutoshi Iijima1, Hiroumi Nagahama, Akari Takada

  • 1Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, 12-1 Ichigayafunagawara-machi, Shinjuku-ku, Tokyo 162-0826, Japan. mhashizu@ci.kagu.tus.ac.jp.

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Material-binding peptides enable surface functionalization of polyetherimide (PEI) with hydroxyapatite (HAp). This study demonstrates successful HAp coating on PEI films using engineered peptides for biomimetic mineralization and nanoparticle immobilization.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Material-binding peptides offer mild, non-damaging surface functionalization.
  • Polyetherimide (PEI) is a versatile polymer requiring surface modification for specific applications.
  • Hydroxyapatite (HAp) is crucial for bone regeneration and biomimetic coatings.

Purpose of the Study:

  • To functionalize polyetherimide (PEI) surfaces with hydroxyapatite (HAp) using engineered peptides.
  • To investigate biomimetic mineralization and nanoparticle immobilization on PEI.
  • To evaluate the efficacy of two distinct peptide designs for HAp surface modification.

Main Methods:

  • Synthesis of PEI-binding peptides conjugated with triasparate or HAp-binding peptide (HABP).
  • Treatment of PEI films with synthesized peptides.
  • Biomimetic mineralization in simulated body fluids (SBFs).
  • Characterization of surface deposits (HAp and amorphous calcium phosphate (ACP) nanoparticles).

Main Results:

  • PEI films treated with p1-triasparate peptides showed HAp deposits.
  • PEI films treated with p1-HABP peptides successfully immobilized HAp and ACP nanoparticles.
  • Subsequent immersion in SBFs resulted in complete HAp coverage on PEI films modified with p1-HABP peptides.

Conclusions:

  • Engineered peptides effectively facilitate HAp surface functionalization on PEI.
  • The p1-HABP peptide strategy enables robust immobilization and biomimetic growth of HAp.
  • This approach holds promise for developing advanced biomaterials with enhanced osseointegration properties.