title: In vitro biocompatibility evaluation of novel urethane-siloxane co-polymers based on poly(ϵ-caprolactone)-block-poly(dimethylsiloxane)-block-poly(ϵ-caprolactone).
abstract: Novel polyurethane co-polymers (TPUs), based on poly(ϵ-caprolactone)-block-poly(dimethylsiloxane)-block-poly(ϵ-caprolactone) (PCL-PDMS-PCL) as soft segment and 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BD) as hard segment, were synthesized and evaluated for biomedical applications. The content of hard segments (HS) in the polymer chains was varied from 9 to 63 wt%. The influence of the content and length of the HS on the thermal, surface, mechanical properties and biocompatibility was investigated. The structure, composition and HS length were examined using (1)H- and quantitative (13)C-NMR spectroscopy. DSC results implied that the synthesized TPUs were semicrystalline polymers in which both the hard MDI/BD and soft PCL-PDMS-PCL segments participated. It was found that an increase in the average HS length (from 1.2 to 14.4 MDI/BD units) was accompanied by an increase in the crystallinity of the hard segments, storage moduli, hydrophilicity and degree of microphase separation of the co-polymers. Depending on the HS content, a gradual variation in surface properties of co-polymers was revealed by FT-IR, AFM and static water contact angle measurements. The in vitro biocompatibility of co-polymers was evaluated using the endothelial EA.hy926 cell line and protein adsorption on the polyurethane films. All synthesized TPUs adsorbed more albumin than fibrinogen from multicomponent protein mixture, which may indicate biocompatibility. The polyurethane films with high HS content and/or high roughness coefficient exhibit good surface properties and biocompatible behavior, which was confirmed by non-toxic effects to cells and good cell adhesion. Therefore, the non-cytotoxic chemistry of the co-polymers makes them good candidates for further development as biomedical implants.
authors: a Institute of Chemistry, Technology and Metallurgy, University of Belgrade , Studentski trg 12-16 , Belgrade , Serbia.
authors: Marija V
authors: MV
authors: Pergal
authors: Vesna V
authors: VV
authors: Antic
authors: Gordana
authors: G
authors: Tovilovic
authors: Jelena
authors: J
authors: Nestorov
authors: Dana
authors: D
authors: Vasiljevic-Radovic
authors: Jasna
authors: J
authors: Djonlagic
mesh_terms: D000327:Adsorption; D000418:Albumins / Q000737:chemistry; D000818:Animals; D002208:Caproates / Q000737:chemistry; D066241:Carbon-13 Magnetic Resonance Spectroscopy; D002417:Cattle; D002448:Cell Adhesion; D002460:Cell Line; D002470:Cell Survival; D042783:Endothelial Cells / Q000502:physiology; D005340:Fibrinogen / Q000737:chemistry; D006801:Humans; D006860:Hydrogen Bonding; D057927:Hydrophobic and Hydrophilic Interactions; D007783:Lactones / Q000737:chemistry; D008422:Materials Testing; D018625:Microscopy, Atomic Force; D011140:Polyurethanes / Q000737:chemistry; D066244:Proton Magnetic Resonance Spectroscopy; D012833:Siloxanes / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000418:Albumins; D002208:Caproates; D007783:Lactones; D011140:Polyurethanes; D012833:Siloxanes; D014867:Water; C121056:caprolactone; D005340:Fibrinogen