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Summary of diagnostic band positions for various moieties in peptide systems, based on previous studies [13, 16, 22-30].
| Chemical moiety and vibrational mode | Band positions |
|---|---|
| Amide NH bend (Amide II) | 1475-1525 |
| Amide CO stretch (Amide I) | 1675-1725 |
| Carboxylic acid CO stretch | 1725-1775 |
| Indole NH stretch | 3480-3520 |
| Carboxylic acid OH stretch | 3540-3600 |
| Sulfate OH stretch | 3580-3600 |
| Alcohol OH stretch | 3600-3675 |
| Phosphate OH stretch | 3650-3700 |
