Geology Reference
In-Depth Information
Metasequoia glyptostroboides
a
After extraction
C
16S
FA
m/z 83+85
C
16U
FA
G
G
C
18
FA
P
v
Ps
Ps Ps
G
G
P
Ps
P1
St
C
1
I
C
16U
FA
C
18S
FA
G
Ps
P
s
Ps
Retention time
b
After base hydrolysis
m/z
83+85
G
G
G
P2
Ps
P1
Ps
G
G
Ps
P
St
Ps
Ps
Retention time
Fig. 2.5
Partial ion chromatogram showing the pyrolysis-GC/MS analysis of modern
Metasequoia
glyptostroboides
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). Other legends same as in Figs.
2.2
and
2.3
Figure
2.5a
shows the pyrolysis trace of the gymnosperm
Metasequoia
glyptostroboides
. Lignin, polysaccharides and cutin moieties are abundant, whereas
the
n
-alkanes and
n
-alk-1-enes are detected in extremely subordinate relative abun-
dance (also see inset
m/z
83 + 85 mass chromatogram; Yang et al.
2005
, Fig. 3). The
pyrolysate of Residue 2 post saponifi cation (Fig.
2.5b
) similarly contains polysac-
charide and lignin moieties but no aliphatic component.
Data on all species investigated as part of this study are presented in Table
2.1
. In
all of these apart from
Agave
,
Prunus
and
Clivia
(see above),
n
-alkane/alk-1-ene
homologues were present in the pyrolysate of Residue 1, albeit in low (but variable)
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