| Autor: |
Gonçalves Adilson R., Schuchardt Ulf, Bianchi Maria L., Curvelo Antonio A. S. |
| Jazyk: |
angličtina |
| Rok vydání: |
2000 |
| Předmět: |
|
| Zdroj: |
Journal of the Brazilian Chemical Society, Vol 11, Iss 5, Pp 491-494 (2000) |
| Druh dokumentu: |
article |
| ISSN: |
0103-5053 |
| Popis: |
Lignin of piassava (Attalea funifera) was analyzed by ¹H- and 13C-NMR spectroscopy. The HGS-nature of this lignin was confirmed but p-coumarate units are also present in the lignin. Methoxyl and phenolic hydroxyl contents per phenylpropanic unit were determined by ¹HNMR spectroscopy to be 0.57 and 0.68, respectively and are in agreement with wet chemistry methods. A small extent of lignin condensation (35%) was explained by the high content of cinnamyl alcohol structures, evidenced by 13CNMR-DEPT. An extended C9formula for the piassava lignin was established to be |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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