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Table 3 Assignments of amide bands to the secondary structure of peptides and proteins (literature data)

From: Investigation of chemical transformations of thiophenylglycoside of muramyl dipeptide on the fumed silica surface using TPD-MS, FTIR spectroscopy and ES IT MS

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]

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