Biomedical Engineering Reference
In-Depth Information
Table 8.1 ( Continued )
Major Characteristic Peak Frequencies Reported in the Literature
Reference
Number
Peak
Assignment
FT-IR
Raman
2959 cm −1
C-H stretching
*
74
ν as CH 3 of lipids, DNA, and
proteins
*
51
Asymmetric stretching mode of
the methyl groups from cellular
proteins, nucleic acids, and lipids
*
51
Asymmetric stretching of
methoxy (2)
*
6
2960 cm −1
ν as CH 3
*
65
Out-of-plane chain-end
antisymmetric CH 3 stretch band
*
2
2963 cm −1
CH 3 modes
*
57
2965 cm −1
Stretching C-H
*
48
2969 cm −1
Asymmetric stretching of
methoxy (3)
*
6
2970 cm −1
Asymmetric stretching of
methoxy (1)
*
6
ν as CH 3 , lipids, fatty acids
*
7
Cholesterol and cholesterol ester
*
2
2971/3 cm −1
Asymmetric stretching of
methoxy (4)
*
6
2975 cm −1
Stretching N-H, stretching C-H
*
48
2984 cm −1
CH α,α' stretch
*
6
2993/4 cm -1
C-H ring
*
48
2994 cm −1
CH α,α' stretch
*
6
2998/9 cm −1
C-H ring
*
48
3000 cm −1
C-H ring
*
48
CH stretching vibrations (remain
unaltered by the methoxy and
hydroxyl substitution)
*
6
>3000 cm −1
CH stretching
*
90
3000-600 cm −1
N-H stretching
*
83
3007 cm −1
C-H
*
74
3007-10 cm −1
= C-H groups that are related to
olefins bands or unsaturated
fatty acids (absent in cancer
samples)
*
74
3008 cm −1
C-H ring
*
48
ν as (= C-H), lipids, fatty acids
*
7
3010 cm −1
Unsaturated = CH stretch
*
2
3015 cm −1
*
51
ν = CH of lipids
CH stretching band of the phenyl
rings
*
6
 
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