The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B

The potassium chloride-soluble fraction of carrageenan from the red seaweed Iridaea undulosa Bory contains both μ-like and λ-like carrageenans. These were partly separated by extraction with hot dimethyl sulfoxide, and characterized by methylation analysis, both before and after alkaline modificatio...

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Autores principales: Stortz, C.A., Cerezo, A.S.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00086215_v145_n2_p219_Stortz
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00086215_v145_n2_p219_Stortz2023-10-03T14:06:20Z The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B Stortz, C.A. Cerezo, A.S. The potassium chloride-soluble fraction of carrageenan from the red seaweed Iridaea undulosa Bory contains both μ-like and λ-like carrageenans. These were partly separated by extraction with hot dimethyl sulfoxide, and characterized by methylation analysis, both before and after alkaline modification. In addition to regions composed of μ- or λ-type repeating units, both fractions contained regions of structural irregularity. Unusual units were found in these last regions, namely: (a) 2- and 6-linked galactose residues, (b) 3-linked, 6-sulfated and 2,6-disulfated residues, and (c) a small amount of branching with galacto- and xylo-pyranose units as nonreducing end groups. The determination of the changes in composition of the samples as a function of the number of methylation steps provided confidence in assignments of structural significance to minor components. These were characterized by g.l.c. and computerized g.l.c.-m.s. techniques under carefully chosen operating conditions, using two different sets of derivatives. © 1986. Fil:Stortz, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cerezo, A.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00086215_v145_n2_p219_Stortz
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The potassium chloride-soluble fraction of carrageenan from the red seaweed Iridaea undulosa Bory contains both μ-like and λ-like carrageenans. These were partly separated by extraction with hot dimethyl sulfoxide, and characterized by methylation analysis, both before and after alkaline modification. In addition to regions composed of μ- or λ-type repeating units, both fractions contained regions of structural irregularity. Unusual units were found in these last regions, namely: (a) 2- and 6-linked galactose residues, (b) 3-linked, 6-sulfated and 2,6-disulfated residues, and (c) a small amount of branching with galacto- and xylo-pyranose units as nonreducing end groups. The determination of the changes in composition of the samples as a function of the number of methylation steps provided confidence in assignments of structural significance to minor components. These were characterized by g.l.c. and computerized g.l.c.-m.s. techniques under carefully chosen operating conditions, using two different sets of derivatives. © 1986.
format JOUR
author Stortz, C.A.
Cerezo, A.S.
spellingShingle Stortz, C.A.
Cerezo, A.S.
The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B
author_facet Stortz, C.A.
Cerezo, A.S.
author_sort Stortz, C.A.
title The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B
title_short The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B
title_full The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B
title_fullStr The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B
title_full_unstemmed The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B
title_sort potassium chloride-soluble carrageenans of the red seaweed iridaea undulosa b
url http://hdl.handle.net/20.500.12110/paper_00086215_v145_n2_p219_Stortz
work_keys_str_mv AT stortzca thepotassiumchloridesolublecarrageenansoftheredseaweediridaeaundulosab
AT cerezoas thepotassiumchloridesolublecarrageenansoftheredseaweediridaeaundulosab
AT stortzca potassiumchloridesolublecarrageenansoftheredseaweediridaeaundulosab
AT cerezoas potassiumchloridesolublecarrageenansoftheredseaweediridaeaundulosab
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