FTIR and Raman Characteristic Peak Frequencies in Biological Studies - Vibrational Spectroscopy for Tissue Analysis - page 269

Table 8.1 ( Continued )
Major Characteristic Peak Frequencies Reported in the Literature

Reference
Number Peak Assignment FT-IR Raman

Due to the stretching of -C-N
and bending of -N-H group of
R- CONR2

* 30

1550-650 cm −1 Ring stretching vibrations with

little interaction with CH
in-plane bending

* 13

1550-700 cm −1 C= C * 1

1550-800 cm −1 Region of the base vibrations * 48

1552 cm −1 Tryptophan * 20

ν(C= C), tryptophan (protein
assignment)

* 20

ν(C= C), porphyrin * 20

Ring base * 48

1553 cm −1 CO stretching * 64

Predominately α-sheet of amide II
(Amide II band mainly stems
from the C-N stretching and
C-N-H bending vibrations
weakly coupled to the C= O
stretching mode.)

* 83

1554 cm −1 Amide II * 15

1555 cm −1 Ring base * 48

1558 cm −1 Tryptophan * 3

ν(CN) and δ (NH) amide II
(protein assignment)

* 33

ν(C= C) porphyrin * 33

Tyrosine, amide II, COO − * 43

1559 cm −1 Ring base * 48

1560 cm −1 Tryptophan * 42

1560-600 cm −1 COO − * 15

1567 cm −1 Ring base * 48

1570 cm −1 Amide II * 42

1571/3 cm −1 C= N adenine * 48

1573 cm −1 Guanine, adenine, TRP (protein) * 9

1574 cm −1 C= N adenine * 48

Tryptophan, nucleic acids
(guanine, adenine), protein in
tumours

* 17

1575 cm −1 Ring breathing modes in the

DNA bases

* 12

G, A (ring breathing modes of the
DNA/RNA bases)

( Continued )