Computer Science
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1397s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Issue 9, pp.1397-1405
Computer Science
4
Scientific paper
Lignin derivatives have been isolated for the first time from carbonaceous sections of the silicified (~90% SiO 2 ) conifer Araucarioxylon arizonicum . The products released by sequential high vacuum pyrolysis and identified by combined gas chromatography-mass spectrometry (GC-MS) include a wide variety of alkyl-substituted, phenolic and condensed aromatic compounds. Brauns spruce lignin was pyrolized and analyzed by GC-MS as a comparison for the fossil wood data. The primary pyrolyzates at the 300°C step were CO 2 , H 2 O, ethanol and propanol. The main product at 450°C was 4-methyl-2-methoxyphenol (methyl guaiacol), but at 600°C the pyrolyzates were similar both in product composition and in relative abundance to those from silicified wood. The results suggest that the fossil wood experienced a mild thermal event during which the ether bonds were ruptured and loss of oxygen occurred along with the rearrangement of the original wood into a highly stable polymer.
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