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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Polymer Science

Background:

  • Nanostructured surfaces can influence protein behavior, impacting biomaterial performance.
  • Polyethylene single crystals (PE-SC) offer a reproducible nanostructure for studying protein adsorption.
  • Understanding protein orientation on surfaces is crucial for advanced biomaterials.

Purpose of the Study:

  • To test if human plasma fibrinogen (HPF) adsorbs on PE-SC surfaces along specific crystallographic directions.
  • To investigate the effect of pH on HPF assembly and orientation on PE-SC.
  • To advance control over protein assembly on nanostructured polymer surfaces.

Main Methods:

  • Preparation of PE-SC samples via isothermal crystallization.
  • Characterization using atomic force microscopy (AFM) before and after protein adsorption.
  • Adsorption experiments conducted at varying HPF concentrations and pH levels (7.4 and 9.2).

Main Results:

  • At pH 7.4, HPF formed non-oriented multiprotein structures due to protein-protein interactions.
  • At pH 9.2, single HPF molecules adsorbed, with trinodal-rod-shaped molecules showing preferential orientation along [100] and [010] crystallographic directions.
  • HPF molecules aligned on surfaces significantly smaller than their own dimensions.

Conclusions:

  • HPF orientation on PE-SC surfaces is pH-dependent, influenced by protein-protein interactions and surface atom density.
  • Controlled protein adsorption on nanostructured polymers is achievable.
  • Findings contribute to designing improved surfaces for implants and biosensors through controlled protein assembly.