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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