Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin

Detalhes bibliográficos
Autor(a) principal: Gonçalves,Adilson R.
Data de Publicação: 2000
Outros Autores: Schuchardt,Ulf, Bianchi,Maria L., Curvelo,Antonio A. S.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Journal of the Brazilian Chemical Society (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000500010
Resumo: 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 <img SRC="http:/img/fbpe/jbchs/v11n5/a10img01.gif">
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spelling Piassava fibers (Attalea funifera): NMR spectroscopy of their ligninpiassava fibersligninNMR-spectroscopyLignin 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 <img SRC="http:/img/fbpe/jbchs/v11n5/a10img01.gif">Sociedade Brasileira de Química2000-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000500010Journal of the Brazilian Chemical Society v.11 n.5 2000reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532000000500010info:eu-repo/semantics/openAccessGonçalves,Adilson R.Schuchardt,UlfBianchi,Maria L.Curvelo,Antonio A. S.eng2001-01-15T00:00:00Zoai:scielo:S0103-50532000000500010Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2001-01-15T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
title Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
spellingShingle Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
Gonçalves,Adilson R.
piassava fibers
lignin
NMR-spectroscopy
title_short Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
title_full Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
title_fullStr Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
title_full_unstemmed Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
title_sort Piassava fibers (Attalea funifera): NMR spectroscopy of their lignin
author Gonçalves,Adilson R.
author_facet Gonçalves,Adilson R.
Schuchardt,Ulf
Bianchi,Maria L.
Curvelo,Antonio A. S.
author_role author
author2 Schuchardt,Ulf
Bianchi,Maria L.
Curvelo,Antonio A. S.
author2_role author
author
author
dc.contributor.author.fl_str_mv Gonçalves,Adilson R.
Schuchardt,Ulf
Bianchi,Maria L.
Curvelo,Antonio A. S.
dc.subject.por.fl_str_mv piassava fibers
lignin
NMR-spectroscopy
topic piassava fibers
lignin
NMR-spectroscopy
description 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 <img SRC="http:/img/fbpe/jbchs/v11n5/a10img01.gif">
publishDate 2000
dc.date.none.fl_str_mv 2000-10-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000500010
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532000000500010
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50532000000500010
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Journal of the Brazilian Chemical Society v.11 n.5 2000
reponame:Journal of the Brazilian Chemical Society (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Journal of the Brazilian Chemical Society (Online)
collection Journal of the Brazilian Chemical Society (Online)
repository.name.fl_str_mv Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv ||office@jbcs.sbq.org.br
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