The carrageenan from Iridaea undulosa B.; Analysis, fractionation and alkaline treatment

The carrageenan extracted from the seaweed Iridaea undulosa is devoid of a k‐fraction and is composed of major amounts of ‘intermediate fractions’ (fractions which precipitate at potassium chloride concentrations higher than 0.125M) and lesser amounts of a ‘soluble fraction’ (soluble in 2.0M potassi...

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Autores principales: Matulewicz, María Cristina, Cerezo, Alberto Saúl
Publicado: 1980
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00225142_v31_n2_p203_Matulewicz
http://hdl.handle.net/20.500.12110/paper_00225142_v31_n2_p203_Matulewicz
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00225142_v31_n2_p203_Matulewicz
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spelling paper:paper_00225142_v31_n2_p203_Matulewicz2023-06-08T14:51:16Z The carrageenan from Iridaea undulosa B.; Analysis, fractionation and alkaline treatment Matulewicz, María Cristina Cerezo, Alberto Saúl The carrageenan extracted from the seaweed Iridaea undulosa is devoid of a k‐fraction and is composed of major amounts of ‘intermediate fractions’ (fractions which precipitate at potassium chloride concentrations higher than 0.125M) and lesser amounts of a ‘soluble fraction’ (soluble in 2.0M potassium chloride). It did not form gels in water or milk. The preparative fractionation of the carrageenan gave eight fractions which precipitated in narrow ranges of potassium chloride concentrations and on ultracentrifugation showed only one sharp peak. Analysis of these fractions, their infrared spectra, and the results of the periodate oxidation analysis permitted the identification of some structural units and suggested others. The alkaline treatment of the carrageenan gave a product comprising a k‐fraction and a soluble fraction. The k‐fraction, obtained with a high yield (53.6% of the modified polysaccharide), is capable of gelling. Copyright © 1980 John Wiley & Sons, Ltd Fil:Matulewicz, M.C. 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. 1980 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00225142_v31_n2_p203_Matulewicz http://hdl.handle.net/20.500.12110/paper_00225142_v31_n2_p203_Matulewicz
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 carrageenan extracted from the seaweed Iridaea undulosa is devoid of a k‐fraction and is composed of major amounts of ‘intermediate fractions’ (fractions which precipitate at potassium chloride concentrations higher than 0.125M) and lesser amounts of a ‘soluble fraction’ (soluble in 2.0M potassium chloride). It did not form gels in water or milk. The preparative fractionation of the carrageenan gave eight fractions which precipitated in narrow ranges of potassium chloride concentrations and on ultracentrifugation showed only one sharp peak. Analysis of these fractions, their infrared spectra, and the results of the periodate oxidation analysis permitted the identification of some structural units and suggested others. The alkaline treatment of the carrageenan gave a product comprising a k‐fraction and a soluble fraction. The k‐fraction, obtained with a high yield (53.6% of the modified polysaccharide), is capable of gelling. Copyright © 1980 John Wiley & Sons, Ltd
author Matulewicz, María Cristina
Cerezo, Alberto Saúl
spellingShingle Matulewicz, María Cristina
Cerezo, Alberto Saúl
The carrageenan from Iridaea undulosa B.; Analysis, fractionation and alkaline treatment
author_facet Matulewicz, María Cristina
Cerezo, Alberto Saúl
author_sort Matulewicz, María Cristina
title The carrageenan from Iridaea undulosa B.; Analysis, fractionation and alkaline treatment
title_short The carrageenan from Iridaea undulosa B.; Analysis, fractionation and alkaline treatment
title_full The carrageenan from Iridaea undulosa B.; Analysis, fractionation and alkaline treatment
title_fullStr The carrageenan from Iridaea undulosa B.; Analysis, fractionation and alkaline treatment
title_full_unstemmed The carrageenan from Iridaea undulosa B.; Analysis, fractionation and alkaline treatment
title_sort carrageenan from iridaea undulosa b.; analysis, fractionation and alkaline treatment
publishDate 1980
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00225142_v31_n2_p203_Matulewicz
http://hdl.handle.net/20.500.12110/paper_00225142_v31_n2_p203_Matulewicz
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