Geology Reference
In-Depth Information
a
Pandinus emperator
cuticle
6
5
f
h
d
e
g
1
10
11
15
2
a
7
12
9
h
6
8
16
b
13 14
c
3
4
b
Limulus
polyphemus
cuticle
Protein
6
Catechol
CH
2
OH
OH
HN
+
N
O
O
O
OH
Chitin
CH2
5
CH2
NH
C=O
C=O
f
e
h
h
1
R
CH
3
8
g
7
2
12
10
3
14
16
c
Limulus polyphemus
C
16
FA
o
o
Methylated chitin/ protein products and
short chain acids
C
18
FA
o
o
o
Retention time
Fig. 7.2
Py-GC-MS analysis of modern scorpion and
Limulus
cuticles. (
a
) Partial Py-GC-MS
chromatogram of modern
Pandinus imperator
cuticle revealing the presence of chitin or protein
and cuticular lipids. (
b
) Partial Py-GC-MS chromatogram of
Limulus
cuticle revealing the same,
with the inset showing the chemical structure of arthropod cuticle (adapted from Stankiewicz et al.
1996
). (
c
) Partial TMAH pyrolysis (thermochemolysis)-GC/MS chromatogram of
Limulus
cuticle
revealing the distribution of fatty acyl moieties (o). Note difference in retention time of the acids
during thermochemolysis (Fig.
7.2c
) compared to that from pyrolysis (Fig.
7.2a
) due to methyla-
tion reactions. Retention time in Fig.
7.2a b
and are different because of different GC programs
used. For key to annotations see Table
7.2
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