BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)

Alkaline extraction of Lessonia vadosa blades collected in Fuerte Bulnes (southern Chile) afforded sodium alginate in 14.5% yield. Partial acid hydrolysis of the sodium alginate gave three fractions which were characterised by one- and two-dimensional nuclear magnetic resonance techniques. Fraction...

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Autores principales:	MATSUHIRO,BETTY, TORRES,SIMONET E, GUERRERO,JUAN
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2007
Materias:	seaweeds alginic acid block composition Lessonia vadosa NMR
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000100009
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spelling	oai:scielo:S0717-970720070001000092007-05-07BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)MATSUHIRO,BETTYTORRES,SIMONET EGUERRERO,JUAN seaweeds alginic acid block composition Lessonia vadosa NMR Alkaline extraction of Lessonia vadosa blades collected in Fuerte Bulnes (southern Chile) afforded sodium alginate in 14.5% yield. Partial acid hydrolysis of the sodium alginate gave three fractions which were characterised by one- and two-dimensional nuclear magnetic resonance techniques. Fraction 1 (17.8 % yield) showed to be mainly composed of alternate heteropolymeric block (MG) and in minor proportions of polymannuronic sequences. Analysis of 13C NMR and 2D HSQC spectra indicated that Fraction 2 (64.5% yield) is a polymannuronic enriched fraction. The minor amount of guluronic acid residues in this fraction showed by 2D ¹H/¹H NOESY NMR spectrum to be present in a 1→4 homopolyguluronic sequence; moreover, the interresidue correlation data indicated that MG blocks were not present. Results are in agreement with data obtained by FT-IR spectroscopy in the solid state. Full assignments of ¹H and 13C signals in the NMR spectra indicated that Fraction 3 (17.7%) presented a regular homopolyguluronic block structureinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.52 n.1 20072007-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000100009en10.4067/S0717-97072007000100009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	seaweeds alginic acid block composition Lessonia vadosa NMR
spellingShingle	seaweeds alginic acid block composition Lessonia vadosa NMR MATSUHIRO,BETTY TORRES,SIMONET E GUERRERO,JUAN BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)
description	Alkaline extraction of Lessonia vadosa blades collected in Fuerte Bulnes (southern Chile) afforded sodium alginate in 14.5% yield. Partial acid hydrolysis of the sodium alginate gave three fractions which were characterised by one- and two-dimensional nuclear magnetic resonance techniques. Fraction 1 (17.8 % yield) showed to be mainly composed of alternate heteropolymeric block (MG) and in minor proportions of polymannuronic sequences. Analysis of 13C NMR and 2D HSQC spectra indicated that Fraction 2 (64.5% yield) is a polymannuronic enriched fraction. The minor amount of guluronic acid residues in this fraction showed by 2D ¹H/¹H NOESY NMR spectrum to be present in a 1→4 homopolyguluronic sequence; moreover, the interresidue correlation data indicated that MG blocks were not present. Results are in agreement with data obtained by FT-IR spectroscopy in the solid state. Full assignments of ¹H and 13C signals in the NMR spectra indicated that Fraction 3 (17.7%) presented a regular homopolyguluronic block structure
author	MATSUHIRO,BETTY TORRES,SIMONET E GUERRERO,JUAN
author_facet	MATSUHIRO,BETTY TORRES,SIMONET E GUERRERO,JUAN
author_sort	MATSUHIRO,BETTY
title	BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)
title_short	BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)
title_full	BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)
title_fullStr	BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)
title_full_unstemmed	BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)
title_sort	block structure in alginic acid from lessonia vadosa (laminariales, phaeophyta)
publisher	Sociedad Chilena de Química
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000100009
work_keys_str_mv	AT matsuhirobetty blockstructureinalginicacidfromlessoniavadosalaminarialesphaeophyta AT torressimonete blockstructureinalginicacidfromlessoniavadosalaminarialesphaeophyta AT guerrerojuan blockstructureinalginicacidfromlessoniavadosalaminarialesphaeophyta
_version_	1718445369363267584

BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA)

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