Geology Reference
In-Depth Information
Acer campestre
C
16S
FA
m/z
83+85
a
After extraction
C
16U
FA
C
18U
FA
G
P
v
C
18S
FA
C
29
C
20
+
-
-
+
-
-
+
+
-
+
+
-
-
-
+
+
P1
-
+
-
Ps
G
S
P
S
G
G
S
Ps
C
16S
FA
Ps
P2
C
1
I
I
C
16U
FA
C
18S
FA
C
20
C
29
X
X
X
X
X
X
X
X
X
X
X
X
Retention time
b
After base hydrolysis
I
P1
C
1
I
m/z
83+85
Ps
G
G
Pyr
P
P2
Ps
Ps
G
S
G
S
Retention time
Fig. 2.4
Partial ion chromatogram showing the pyrolysis-GC/MS analysis of modern
Acer camp-
estre
leaf (
a
) after lipid extraction (Residue 1); and (
b
) after lipid extraction followed by saponifi -
cation (Residue 2). Note the presence of long-chain
n
-alkane/alk-1-ene homologues in trace
amounts in the extracted plant tissue and its absence post saponifi cation (as revealed by inset
m/z
83 + 85 mass chromatograms).
Pyr
pyrrole derivative. Other legends same as in Figs.
2.2
and
2.3
in
Agave
or
Prunus
. The
m/z
83 + 85 mass chromatogram (Fig.
2.4a
inset) focuses
on this homologous series of
n
-alkanes and
n
-alk-1-enes, which range in carbon
number to C
31
. The pyrolysate of Residue 2, following saponifi cation, contain
moieties related mainly to polysaccharides and lignin. Fatty acyl moieties and
homologous series of
n
-alkanes and
n
-alk-1-enes are absent (Fig.
2.4b
) in the pyrol-
ysate. Saponifi cation is expected to remove cutin, and the absence of fatty acyl
moieties and vinyl phenol (Tegelaar et al.
1989b
) in the pyrolysates of Residue 2
indicates that this has occurred.
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