Biomedical Engineering Reference
In-Depth Information
Table 2.2
Assignment for the Most Characteristic Raman and IR Bands
Chemical Groups
Representatives
FT-Raman (cm
-1
)
Assignment
ATR-IR (cm
-1
)
Assignment
Proteins
1655
Amide I
**
1655
Amide I
**
α-Helix
>1275
Amide III
***
Anti-parallel β-sheet
1670
Amide I
1670
Amide I
1235
Amide III
Disordered structure
1665
Amide I
1665
Amide I
(solvated)
1245
Amide III
Disordered structure
1685
Amide I
1685
Amide I
(non-hydrogen bonded)
1235
Amide III
1543-1480
Amide II
****
Lipids/fatty acids
3008
ν
as
(=C-H)
2970
ν
as
(CH
3
)
2940
ν
as
(CH
2
)
2885
ν
as
(CH
3
)
2850
ν
as
(CH
2
)
1750
ν(C=O)
1750
ν(C=O)
1670
ν(C=C)
trans
1670
ν(C=C)
trans
1660
ν(C=C)
cis
1660
ν(C=C)
cis
1444
δ(CH
2
)
1444
δ(CH
2
)
1300
τ
ip
(CH
2
)
1266
δ
ip
(=C-H)
cts
1100-800
ν(C-C)
Monosaccharides
α-Glucose
847
(C-O-C) skeletal mode
β-Glucose
898
(C-O-C) skeletal mode
β-Fructose
868
(C-O-C) skeletal mode
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