Table 2.

Amide wave number and protein secondary structure of silk firoin (SF) [86].

Conformation	Amides and Wavenumbers (cm−1)
	I (CO Stretch)	II (NH Deformation)	III (CN Stretch, NH Bends)
β-sheet	1625–1640	1520–1530	1219–1245
Random coil	1625–1660	1520–1545	1257–1258