Table 3 Assignments of amide bands to the secondary structure of peptides and proteins (literature data)
Assignment | Amide I, ν(сm−1) | Amide II, ν(сm−1) | Reference |
---|---|---|---|
α-helix | 1,649; 1,653 to 1,657; 1,655 | 1,545 | [45] |
1,648 to 1,660 | - | [46] | |
1,650 to 1,652 | 1,540 to 1,546; 1,516 | [47] | |
β-sheet | 1,621 to 1,623; 1,630; 1,634 to 1,639; 1,647 to 1,648 | 1,530 | [45] |
1,620 to 1,640; 1,670 to 1,695 | - | [46] | |
1,633 | 1,530 | [47] | |
β-turn | 1,661; 1,667; 1,673; 1,677 | 1,528; 1,577 | [45] |
1,620 to 1,640; 1,650 to 1,695 | - | [46] | |
1,663; 1,670; 1,683; 1,688; 1,694 | [47] | ||
Random coil | 1,648; 1,654; 1,642 to 1,657 | - | [45] |
1,640 to 1,657; 1,660 to 1,670 | - | [46] |