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Type: Artigo de periódico
Title: Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
Author: Goncalves, AR
Schuchardt, U
Bianchi, ML
Curvelo, AAS
Abstract: Lignin of piassava (Attalea funifera) was analyzed by H-1- and C-13-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 H-1- NMR 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 C-13-NMR-DEPT. An extended C-9-formula for the piassava lignin was established to be (C9.00H2.25H3.73O0.89)-H-ar-O-al(OH)(0.69)(ph)(OH)(0.86)(al)(OCH3)(0.57).
Subject: piassava fibers
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Journal Of The Brazilian Chemical Society. Soc Brasileira Quimica, v. 11, n. 5, n. 491, n. 494, 2000.
Rights: aberto
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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