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
δ(CH
2
); lipids, fatty acids
*
7
CH
2
twisting modes
*
33
δ(CH), τ(CH
2
) (α-helix)
*
43
CH
2
twisting (lipids)
*
43
CH twist
*
58
-(CH
2
)n- in-phase twist vibration
*
*
30
1300-500 cm
−1
CH bending vibrations, weak NH
vibrations, CH in-plane base
deformations and vertical base
stacking interactions
*
47
1301 cm
−1
Assign from Parker (lipid in
normal tissue)
*
54
Triglycerides (fatty acids)
*
49
τ(CH
2
), lipids
*
43
Indicates the concentration of
lipids (in-phase CH
2
twist mode)
*
38, 92
1302 cm
−1
δ(CH
2
) twisting, wagging,
collagen (protein assignment)
*
20, 33
δ(CH
2
) twisting, wagging,
phospholipids (lipid assignment)
*
20, 33
CH
3
/CH
2
twisting or bending
mode of lipid/collagen
*
3
Amide III (protein)
*
12
Methylene bending mode
(a combination of proteins and
phospholipids)
*
41
(CH
2
) twist, phospholipids and
collagen
*
17
1303/4 cm
−1
CH
3
, CH
2
twisting (collagen
assignment)
*
19
1304 cm
−1
CH
2
deformation (lipid), adenine,
cytosine
*
9
1305 cm
−1
Bending mode of CH
3
CH
2
twisting of proteins
*
35
C-N-C and cyclic C-C stretch
*
14
1306 cm
−1
Unassigned band
*
52
1307 cm
−1
Amide III
*
50
1307 cm
−1
CH
3
/CH
2
twisting or bending
mode of lipid/collagen
*
3
CH
3
/CH
2
twisting, wagging
and/or bending mode of
collagens and lipids
*
3
(
Continued
)
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