Table 1. Raman Band Assignments for Silk Fibroin.

Raman band (cm–1)
GF	RFG	RF	intensitya	assignment
1230	1230		m	amide III (β-sheets)
1267	1267		m	amide III (β-sheets, disordered)
1401			m	β-sheets in silk fibers
1449	1449	1455	m br	CH2-, CH3-bending modes
1666	1666	1671	vs	amide I (β-sheets)
2876	2876	2882	s	CH3 symmetric stretching
2934	2934	2941	vs	CH3 asymmetric stretching
3062	3062	3065	m	C–N–H bending
3285	3285		m br	N–H stretching (β-sheets)

^as, strong; m, medium; br, broad; and v, very.