title: Carbon coated polyethylene: effect of surface energetics and topography on human platelet adhesion.
abstract: The influence of surface energy and structural properties of carbon coated polyethylene (PE) on the human platelet adhesion was studied. Three types of amorphous carbon coating were obtained by plasma pulse discharge, with the number of pulses grading as 10, 50, 100. Human serum albumin adsorption experiments have been carried out with all samples in vitro. Platelet adhesion analysis by SEM included determination of total quantity of adherent platelets, and respective quantities of platelets at different stages of activation (single, spread, aggregates). Surface topographies ranged from bare PE and such (10 pulses), to globular 0.5 microm in size (50 pulses), and complex fibrillar 3-4 microm structures (100 pulses). Surface free energy varies from 31.7 +/- 0.6 to 40.4 +/- 0.6 mN/m for uncoated PE and 10 pulse coatings, respectively, as determined by contact angle techniques. All studied coatings demonstrate weaker platelet activation properties in comparison with untreated PE. Among all studied coatings, the 50 pulse coated surface seems to be the least suitable for contact with platelets, mainly due to its structural rather than to its energy properties. These data are related to a sharp decrease in the adsorbed protein level for the samples with 50 pulse coatings. The applied analysis of platelet activation enables more accurate characterization of platelet-biomaterial interaction.
authors.affiliation: Research Center for Blood Compatible Biomaterials, Research Institute of Transplantology and Artificial Organs, Moscow, Russia.
authors.forename: I A
authors.initials: IA
authors.lastname: Titushkin
authors.forename: S L
authors.initials: SL
authors.lastname: Vasin
authors.forename: I B
authors.initials: IB
authors.lastname: Rozanova
authors.forename: E N
authors.initials: EN
authors.lastname: Pokidysheva
authors.forename: A P
authors.initials: AP
authors.lastname: Alekhin
authors.forename: V I
authors.initials: VI
authors.lastname: Sevastianov
mesh_terms: D000327:Adsorption / Q000187:drug effects; D002244:Carbon / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D007700:Kinetics; D008422:Materials Testing; D010973:Platelet Adhesiveness / Q000187:drug effects*; D020959:Polyethylene / Q000494:pharmacology*; D012709:Serum Albumin / Q000493:pharmacokinetics; D013499:Surface Properties / Q000187:drug effects*
chemical_list: D012709:Serum Albumin; D002244:Carbon; D020959:Polyethylene