Biodegradable nitric oxide-releasing poly(diol citrate) elastomers

Haichao Zhao, M. Concepcion Serrano, Daniel A. Popowich, Melina R. Kibbe, Guillermo A. Ameer

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


We have developed novel poly(diol citrate) elastomers, which are capable of providing localized and sustained release of nitric oxide (NO). The elastomer prepolymer was obtained by condensation of citric acid, 1,8-octanediol, and N,N'-bis(2-hydroxyethyl)ethylenediamine at 130°C for 40 min. Films were prepared by solvent casting followed by crosslinking at 80°C for 4 days. Mechanical properties were tested. NO-releasing expanded poly (tetrafluoroethylene) (ePTFE) vascular grafts were fabricated by coating the graft's lumen with the prepolymer and crosslinking it at 80°C for 4 days prior to diazeniumdiolation. Samples were diazeniumdiolated via exposure to pressurized NO. Cell compatibility was assessed by monitoring the proliferation of porcine aortic smooth muscle cells (PASMC) on the elastomers. Degradation in phosphate buffer saline (PBS) (pH = 7) at 37°C was evaluated for up to 6 weeks. The secondary amine-containing poly(diol citrate) films had a Young's modulus that ranged from 5.91 to 32.64 MPa, an ultimate tensile stress that ranged from 1.47 to 10.71 MPa, and an elongation at break from 200 to 260%, depending on the content of secondary amine in the feed monomer. These elastomers were degradable and compatible with PASMC. Furthermore, degradation rate was found to be independent of the content of secondary amines in the prepolymer. The NO release from diazeniumdiolated films and ePTFE grafts was sustained for two days. In conclusion, these novel diazeniumdiolated polyester elastomers may be useful in medical devices that require blood contact or control of cell proliferation.

Original languageEnglish (US)
Pages (from-to)356-363
Number of pages8
JournalJournal of Biomedical Materials Research - Part A
Issue number1
StatePublished - Apr 2010


  • Citric acid
  • Diazeniumdiolate
  • Elastomer
  • Nitric oxide
  • Polyester

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys


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