Results 191 to 200 of about 7,276 (219)
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Journal of Agricultural and Food Chemistry, 2002
Lignin model compounds, synthetic lignins, and cedar wood have been analyzed by pyrolysis-gas chromatography(-mass spectrometry) in the presence of tetramethylammonium hydroxide (TMAH) to examine the behavior of beta-5 substructures specifically under these conditions. Two model compounds contained a beta-5 linkage and a gamma-CH2OH group. The phenolic
Ken-Ichi, Kuroda +2 more
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Lignin model compounds, synthetic lignins, and cedar wood have been analyzed by pyrolysis-gas chromatography(-mass spectrometry) in the presence of tetramethylammonium hydroxide (TMAH) to examine the behavior of beta-5 substructures specifically under these conditions. Two model compounds contained a beta-5 linkage and a gamma-CH2OH group. The phenolic
Ken-Ichi, Kuroda +2 more
openaire +2 more sources
Journal of Agricultural and Food Chemistry, 2005
The thermochemolytic behavior of 4-O-etherified cinnamyl alcohols and aldehydes in lignin was investigated in the presence of tetramethylammonium hydroxide (TMAH) (315 degrees C/4 s), using veratrylglycol-beta-(coniferyl alcohol) ether (1a), veratrylglycol-beta-(sinapyl alcohol) ether (1b), and veratrylglycol-beta-(coniferyl aldehyde) ether (2).
Ken-ichi, Kuroda, Akiko, Nakagawa-Izumi
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The thermochemolytic behavior of 4-O-etherified cinnamyl alcohols and aldehydes in lignin was investigated in the presence of tetramethylammonium hydroxide (TMAH) (315 degrees C/4 s), using veratrylglycol-beta-(coniferyl alcohol) ether (1a), veratrylglycol-beta-(sinapyl alcohol) ether (1b), and veratrylglycol-beta-(coniferyl aldehyde) ether (2).
Ken-ichi, Kuroda, Akiko, Nakagawa-Izumi
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Journal of Agricultural and Food Chemistry, 2013
Termites are highly effective in lignocellulose degradation; however, the process of lignin deconstruction along the alimentary canal is not well understood. In this study, the wood metabolites in each gut segment were tentatively analyzed using pyrolysis-gas chromatography-mass spectrometry in the presence of tetramethylammonium hydroxide ...
Jing, Ke +2 more
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Termites are highly effective in lignocellulose degradation; however, the process of lignin deconstruction along the alimentary canal is not well understood. In this study, the wood metabolites in each gut segment were tentatively analyzed using pyrolysis-gas chromatography-mass spectrometry in the presence of tetramethylammonium hydroxide ...
Jing, Ke +2 more
openaire +2 more sources
Journal of Analytical and Applied Pyrolysis, 2010
This paper addresses the identification of (E)-5-formyl-2,3,3′,4′-tetramethoxystilbene (11), a major tetramethylammonium hydroxide (TMAH) thermochemolysis product of guaiacyl dehydrogenation polymer (DHP). It was carried out by comparing the mass spectral data and chromatographic behavior with those of authentic (E)-11, which was prepared by off-line ...
Ken-ichi Kuroda +2 more
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This paper addresses the identification of (E)-5-formyl-2,3,3′,4′-tetramethoxystilbene (11), a major tetramethylammonium hydroxide (TMAH) thermochemolysis product of guaiacyl dehydrogenation polymer (DHP). It was carried out by comparing the mass spectral data and chromatographic behavior with those of authentic (E)-11, which was prepared by off-line ...
Ken-ichi Kuroda +2 more
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Organic Geochemistry, 1996
Abstract When analyzed by the TMAH thermochemolysis procedure and solid-state 13C NMR, DHP guaiacyl lignin is found to yield products which are somewhat similar to those observed in fresh or degraded gymnosperm lignin. The relative amounts of the various TMAH products, particularly the stereoisomeric pairs of 3,4-dimethoxyphenyl-trimethoxypropane ...
Patrick G. Hatcher, Robert D. Minard
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Abstract When analyzed by the TMAH thermochemolysis procedure and solid-state 13C NMR, DHP guaiacyl lignin is found to yield products which are somewhat similar to those observed in fresh or degraded gymnosperm lignin. The relative amounts of the various TMAH products, particularly the stereoisomeric pairs of 3,4-dimethoxyphenyl-trimethoxypropane ...
Patrick G. Hatcher, Robert D. Minard
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Journal of Analytical and Applied Pyrolysis, 2007
Gut content analyses of fish are typically conducted using methods based on visual identification. These can lead to inconsistent results because of their subjective nature, especially when sample sizes are limited or food items are not resolvable. New approaches are required to increase the accuracy of gut content analysis.
Cameron P. McIntyre +2 more
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Gut content analyses of fish are typically conducted using methods based on visual identification. These can lead to inconsistent results because of their subjective nature, especially when sample sizes are limited or food items are not resolvable. New approaches are required to increase the accuracy of gut content analysis.
Cameron P. McIntyre +2 more
openaire +1 more source
Organic Geochemistry, 2000
This paper presents the results from an assessment of the application of a new molecular analytical procedure, 13 CTMAH thermochemolysis, to study the chemical modification of lignin by white-rot and brown-rot fungi. This technique diAers from other molecular chemolysis procedures (e.g.
T.R Filley +3 more
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This paper presents the results from an assessment of the application of a new molecular analytical procedure, 13 CTMAH thermochemolysis, to study the chemical modification of lignin by white-rot and brown-rot fungi. This technique diAers from other molecular chemolysis procedures (e.g.
T.R Filley +3 more
openaire +1 more source