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
1494 cm
−1
In-plane CH bending vibration
*
6
1495 cm
−1
Adenine, thymine (ring breathing
modes of the DNA/RNA bases)
*
4
1495/6 cm
−1
C= C, deformation C-H
*
48
1499 cm
−1
C-C stretching in benzenoid ring
*
28
1500 cm
−1
In-plane CH bending vibration
from the phenyl rings
*
6
CH in-plane bending
*
6
1504 cm
−1
CH
2',5',6'
in-plane band
*
6
In-plane CH bending vibration
from the phenyl rings
*
6
1506 cm
−1
N-H bending
*
28
1506/08/10 cm
−1
Cytosine
*
21
1510 cm
−1
In-plane CH bending vibration
from the phenyl rings
*
6
CH
2,6
in-plane bend
*
6
(A ring breathing modes in the
DNA bases)
*
12
1513 cm
−1
Cytosine
*
21
1514 cm
−1
ν(C= C), diagnostic for the presence
of a carotenoid structure; most
likely a cellular pigment
*
*
22
ν(C= C) carotenoid
*
33
1515 cm
−1
Cytosine
*
21
1517 cm
−1
Amide II
*
65
β-carotene accumulation (C-C
stretch mode)
*
49
1518 cm
−1
ν(C= C), porphyrin
*
20
Carotenoid peaks due to C-C and
conjugated C= C band stretch
*
20
1519 cm
−1
CH
2',5',6'
in-plane band
*
6
1520 cm
−1
Carotene
*
54
1520-38 cm
−1
-C= C- carotenoid
*
9
1521 cm
−1
CH
2,6
in-plane bend
*
6
1522 cm
−1
(-C= C-) stretching of carotenoid
*
60
1524 cm
−1
Carotenoid (absent in normal
tissues)
*
45
Stretching C= N, C= C
*
48
1525 cm
−1
In-plane vibrations of the
conjugated -C= C-
*
81
1526 cm
−1
C= N guanine
*
48
(
Continued
)
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