| Autor: |
De la Cruz FB; Department of Civil, Construction, and Environmental Engineering, Campus Box 7908, North Carolina State University , Raleigh, North Carolina 27695-7908, United States., Yelle DJ, Gracz HS, Barlaz MA |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of agricultural and food chemistry [J Agric Food Chem] 2014 Jul 09; Vol. 62 (27), pp. 6362-74. Date of Electronic Publication: 2014 Jun 26. |
| DOI: |
10.1021/jf501653h |
| Abstrakt: |
The anaerobic decomposition of plant biomass is an important aspect of global organic carbon cycling. While the anaerobic metabolism of cellulose and hemicelluloses to methane and carbon dioxide are well-understood, evidence for the initial stages of lignin decomposition is fragmentary. The objective of this study was to look for evidence of chemical transformations of lignin in woody tissues [hardwood (HW), softwood (SW), and old newsprint (ONP)] after anaerobic decomposition using Klason and acid-soluble lignin, CuO oxidation, and 2D NMR. Tests were conducted under mesophilic and thermophilic conditions, and lignin associations with structural carbohydrates are retained. For HW and ONP, the carbon losses could be attributed to cellulose and hemicelluloses, while carbon loss in SW was attributable to an uncharacterized fraction (e.g., extractives etc.). The 2D NMR and chemical degradation methods revealed slight reductions in β-O-4 linkages for HW and ONP, with no depolymerization of lignin in any substrate. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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