Wavelength, cm–1 Assignment[7,8,9]
490 ν(S–S)
562 ν(S–S)
602 δ(COO−)
753 Trp, ν(C–S)
836 Tyr
941 δ(C–C–N) symmetric, α-helical skeletal
996 R breathing
1003 Phe: asymmetric ring breathing
1183 Tyr, ν(–C–N)
1200–1300 Trp, Phe: δ(R), Amide III – region
1309 Wagging (CH2)
1383 δ(CH3), ν(COO−)
1437 asymmetric δ(CH3), bend (CH2)
1560 Trp: ν(R), ν(r), amide II
1610 NH2 in amino acids