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Amount of immobilised heparin on different polymer substrates *(dependent on PEO spacer length)
| Substrate | Polyurethane-CO2H | Polyurethane-NH2 | Polyurethane-PEO | Polyethylene |
| Heparin [μg/cm2] | 1.40 ± 0.08 | 2.00 ± 0.13 | 0.24 ± 0.04–0.47 ± 0.08* | 4.4 ± 0.1–4.7 ± 0.1 |
