Characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide
Póster presentado en el 18th International Meeting on Organic Geochemistry. Part I. Abstracts, 22-26 septiembre 1997 (Maastricht) The Netherlands
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1997-09
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dig-irnas-es-10261-1857612019-07-12T11:20:24Z Characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide Río Andrade, José Carlos del Nanny, Mark A. Minard, Robert D. Hatcher, Patrick G. Póster presentado en el 18th International Meeting on Organic Geochemistry. Part I. Abstracts, 22-26 septiembre 1997 (Maastricht) The Netherlands Fungi are the major decomposers of wood and are divided into three classes depending on me characteristic decay pattern each produces. In general, soft-rol fungi are capable of degrading both cellulose and lignin, me latter al lower rate, brown-rot fungi preferentially remove me polysaccharides with only minor alteration of the Lignin framework, and white-rot fungi preferentially remove me Lignin in order to expose me cellulose for use as a carbon source (Fengel and Wegener, 1984; Blancherte et al., 1990; Eriksson el al., 1990). Numerous techniques are available to quantitatively measure Lignin in sediments and degrading vegetation, provide an estimate of me type of vascular plant source from which the lignin is derived, and determine me extent of degradation. The most widely used of these techniques is the CuO oxidation method, which has been utilized extensively to characterize Lignin in soils and sedimentary mixtures containing multiple types of organic matter (Hedges and Mann, 1979; Hedges and Ertel, 1982). This procedure oxidizes me lignin macromolecule and produces a series of quantifiable p-hydroxyphenyl, vanillyl and syringyl compounds, (me aldehyde, carboxylic acid and methyl ketone derivatives). The distribution of these phenolic biomarkers allows for chemotaxonomic distinctions (gymnosperm, angiosperm and herbaceous tissues) and me yields allow evaluation of me extent of degradation (Hedges and Ertel, 1982; Hedges and Mann, 1979; Goñi and Hedges, 1992). Recently, another procedure has been developed for me characterization of Lignin using tetramethylammonium hydroxide (TMAH) in sealed glass ampoules. The procedure effectively cleaves the b(beta)O-4 bonds in Lignin releasing lignin-derived compounds in much me same way as me CuO oxidation procedure (McKinney el al., 1995; Hatcher el al., 1995). In me present work, a large set of fresh and degraded gymnosperm, angiosperm and non-woody tissues were examined by TMAH/thermochemolysis. Various parameters, similar to those used in me CuO method, for determining me content of Lignin and me extent of degradation were calculated. For samples degraded by soft- and white-rol fungi, me values for me ratio of acidic to aldehydic monomers (Ad/Al) increase with increasing decomposition as fungal oxidation alters me Lignin macromolecule al me side-chain sites. Brown-rol fungi cause no significant change in me Ad! AJ ratio, indicating that these fungi do not significantly perturb me lignin side chains. In the case of the parameter A, a measure of me total lignin content, changes depend on me type of degradation me wood has undergone. No 2019-07-10T06:32:32Z 2019-07-10T06:32:32Z 1997-09 póster de congreso http://purl.org/coar/resource_type/c_6670 18th International Meeting on Organic Geochemistry. Part I. Abstracts B96: 525-526 (1997) http://hdl.handle.net/10261/185761 en Sí none |
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English |
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Póster presentado en el 18th International Meeting on Organic Geochemistry. Part I. Abstracts, 22-26 septiembre 1997 (Maastricht) The Netherlands |
| format |
póster de congreso |
| author |
Río Andrade, José Carlos del Nanny, Mark A. Minard, Robert D. Hatcher, Patrick G. |
| spellingShingle |
Río Andrade, José Carlos del Nanny, Mark A. Minard, Robert D. Hatcher, Patrick G. Characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide |
| author_facet |
Río Andrade, José Carlos del Nanny, Mark A. Minard, Robert D. Hatcher, Patrick G. |
| author_sort |
Río Andrade, José Carlos del |
| title |
Characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide |
| title_short |
Characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide |
| title_full |
Characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide |
| title_fullStr |
Characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide |
| title_full_unstemmed |
Characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide |
| title_sort |
characterization of ligning degradation in wood using thermochemolysis with tetramethylammonium hydroxide |
| publishDate |
1997-09 |
| url |
http://hdl.handle.net/10261/185761 |
| work_keys_str_mv |
AT rioandradejosecarlosdel characterizationofligningdegradationinwoodusingthermochemolysiswithtetramethylammoniumhydroxide AT nannymarka characterizationofligningdegradationinwoodusingthermochemolysiswithtetramethylammoniumhydroxide AT minardrobertd characterizationofligningdegradationinwoodusingthermochemolysiswithtetramethylammoniumhydroxide AT hatcherpatrickg characterizationofligningdegradationinwoodusingthermochemolysiswithtetramethylammoniumhydroxide |
| _version_ |
1777665024351797248 |