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
DNA
*
37
CH
3
deformations
*
1
1480-543 cm
−1
Amide II
*
7
1480-575 cm
−1
Amide II (Largely due to a
coupling of CN stretching and
in-plane bending of the N-H
group; is not often used for
structural studies per se because
it is less sensitive and is subject
to interference from absorption
bounds of amino acid side chain
vibrations. This is extremely
weak in Raman spectra.)
*
24, 30
1480-600 cm
−1
The region of the amide II band
in tissue proteins. Amide II
mainly stems from the C-N
stretching and C-N-H bending
vibrations weakly coupled to the
C= O stretching mode.
*
83
1481 cm
−1
δ
as
(CH
3
)
*
1
1482 cm
−1
Benzene
*
6
1482/3/5 cm
−1
C
8
-H coupled with a ring
vibration of guanine
*
48
1485 cm
−1
G, A (ring breathing modes in the
DNA bases)
*
12
Nucleotide acid purine bases
(guanine and adenine)
*
9
1485-550 cm
−1
NH
3
+
*
15
1486 cm
−1
Deformation C-H
*
23
1487/8 cm
−1
Guanine (N
7
)
*
21
C= C, deformation C-H
*
48
1488 cm
−1
Collagen
*
97
1488/9 cm
−1
Deformation C-H
*
23
1489 cm
−1
In-plane CH bending vibration
*
6
1490 cm
−1
DNA
*
54
C= C, deformation C-H
*
48
In-plane CH bending vibration
*
6
Formalin peak appearing in the
fixed normal and tumour tissues
*
41
1491 cm
−1
C-N stretching vibration coupled
with the in-plane C-H bending
in amino radical cations
*
15
1492 cm
−1
Formalin peak appearing in the
fixed normal and tumour tissues
*
41
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