| S.No. | Residuce | Infrared frequency (cm−1) |
| 1 | Alamine | ~1465 |
| 2 | Valanine | ~1450 |
| 3 | Leucine | ~1375 |
| 4 | Isoleucine | - |
| 5 | Serine | 1350 cm−1 - 1250 cm−1 |
| 6 | Thronine | - |
| 7 | Asparagine | 1720 cm−1 |
| 8 | Glutamine | 1560 |
| 9 | Asn | ~1650 |
| 10 | Glycine | 1615 |
| 11 | lysine | 1645-1610, 1550-1485, ~1160, ~1100 |
| 12 | Histidine | - |
| 13 | Phenylalanine | 1602, ~1450, 760, 700 |
| 14 | Tyrosine | ~1600 |
| 15 | Tryptophn | - |