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Hydrogen bond distances of uncrosslinked and cross-linked collagen matrices in the 2400–4000 cm−1 spectral range.
| Stretching Frequency (1/cm) | ν1 | ν2 | ν3 | ν4 |
|---|---|---|---|---|
| H-bond distances (nm) | 0.31 | 0.29 | 0.28 | 0.25 |
| UN film | 3673 (4.4%) | 3490 (18.6%) | 3250 (50.6%) | 3116 (26.4%) |
| DHT film | 3671 (0.0%) | 3482 (16.8%) | 3249 (50.0%) | 3135 (33.2%) |
