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
1680 cm
−1
Unordered random coils and
turns of amide I
*
83
νC= O
*
1
1681 cm
−1
C= O guanine deformation N-H
in plane
*
48
*
1
νC= O
1682 cm
−1
One of the absorption positions
for the C= O stretching
vibrations of cortisone
*
102
C= O
*
1
1684 cm
−1
C= O guanine deformation N-H
in plane
*
48
1685 cm
−1
Amide I (disordered structure;
nonhydrogen bonded)
*
*
7
1690 cm
−1
Peak of nucleic acids due to the
base carbonyl stretching and
ring breathing mode
*
50
1694 cm
−1
A high-frequency vibration of an
antiparallel β-sheet of amide I
*
83
(The amide I band is due to
in-plane stretching of the C= O
band weakly coupled with
stretching of the C-N and
in-plane bending of the N-H
bond.)
1695 cm
−1
νC= O
*
1
1697 cm
−1
Amide I (turns and bands)
*
43
1698/9 cm
−1
C
2
= O guanine
*
48
N-H thymine
*
48
1700-15 cm
−1
The region of the bases
*
23
1700-50 cm
−1
ν(C= O)OH (amino acids aspartic
and glutamic acid)
*
7
1700-800 cm
−1
Fatty acid esters
*
56
Lipids observed during cell
apoptosis (more specifically at
1740 cm
−1
)
*
39
1700/2 cm
−1
C= O guanine
*
48
1702 cm
−1
C= O thymine
*
48
Stretching C= O vibrations that
are H-bonded. (Changes in the
C= O stretching vibrations could
be connected with destruction of
old H-bonds and creation of the
new ones.)
*
48
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