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
2915 cm −1
CH band of lipids and proteins
(The lipid band has a tendency
toward higher levels of energy,
such as 2855 cm −1 , while the
protein band's tendency is
toward lower energy levels like
2920 cm −1 .)
*
27
2916 cm −1
Cholesterol, phospholipids, and
creatine (higher in normal
tissues)
*
62
Stretching vibrations of CH 2 and
CH 3 of phospholipids,
cholesterol, and creatine
*
62
2917/8/9 cm −1
Stretching C-H
*
48
2923-33 cm −1
The strongest C-H stretching
bands in malignant tissues
*
74
2923/5 cm −1
Stretching C-H
*
48
2925 cm −1
The strongest C-H stretching
bands in normal tissues
*
74
ν as CH 2 lipids
*
51
2928 cm −1
Stretching C-H
*
48
Symmetric CH 3 stretch
*
27
Due primarily to protein
*
*
27
2930 cm −1
C-H stretching bands
*
74
ν as CH 2
*
65
2934 cm −1
Asymmetric stretching of
methoxy (2)
*
6
2934/9 cm −1
Asymmetric stretching of
methoxy (3)
*
*
6
2935 cm −1
Chain end CH 3 symmetric band
*
2
2940 cm −1
C-H vibrations in lipids and
proteins
*
89
ν as CH 2 , lipids, fatty acids
*
7
2944 cm −1
Asymmetric stretching of
methoxy (1)
*
6
2947/8 cm −1
Stretching C-H
*
48
2950 cm −1
Asymmetric stretching of
methoxy (4)
*
6
2951 cm −1
Stretching C-H
*
48
2952 cm −1
CH 3 asymmetric stretch
*
95
2951/3/5/6 cm −1
Stretching C-H
*
48
2956/7 cm −1
CH 3 asymmetric stretch
*
95
( Continued )
 
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