In vitro short-term platelet adhesion on various metals

Yuta Tanaka, Kazuya Kurashima, Haruka Saito, Akiko Nagai, Yusuke Tsutsumi, Hisashi Doi, Naoyuki Nomura, Takao Hanawa

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


The in vitro short-term platelet adhesion on various metals, as accelerated by the addition of Ca2+, was evaluated in this study. Metals used for medical devices [an austenitic stainless steel, a cobalt (Co)-chromium (Cr)-molybdenum (Mo) alloy, a titanium (Ti)-6 aluminum (Al)-4 vanadium (V) alloy, a Ti-6Al-7 niobium (Nb) alloy, a Tinickel (Ni) alloy, and commercially pure Ti] were immersed into a platelet-rich plasma solution for 5 or 20 min, and platelet adhesion and aggregation on the surfaces were observed using a scanning electron microscope. The platelet adhesion level on each metal after 5 min of immersion in a platelet-rich plasma solution was the smallest in this order: Stainless steel ≤ Co-Cr-Mo alloy < Ti-6Al-4V alloy < Ti-6Al-7Nb alloy < Ti-Ni alloy = Ti. The levels after 5 min of immersion were almost the same as those after 20 min of immersion. Platelet adhesion was minimal on stainless steel and Co-Cr-Mo alloy, which have a Cr2O 3-containing passive surface oxide film, but was accelerated on Ti and Ti alloys having a TiO2-contanining film. A Cr2O 3-containing oxide film has a lower relative permittivity than a TiO2-contanining film; it thus supports a larger electrostatic force than the latter, adsorbs more albumins, which work as inhibitory proteins, and inhibits platelet aggregation. Therefore, platelet adhesion and aggregation are controlled by the composition of the surface oxide film on a metal due to the relative permittivity of the metal, which influences the amount of adsorbed proteins.

Original languageEnglish
Pages (from-to)182-186
Number of pages5
JournalJournal of Artificial Organs
Issue number3
Publication statusPublished - 2009 Sept


  • Metals
  • Platelet adhesion
  • Protein adsorption
  • Surface oxide film


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