Artículo
Abstract:
Two carrageenans from Iridaea undulosa, isolated by precipitation of the crude polysaccharide at O.70-1.05 M and 1.55-1.65 M KCl concentrations, were studied by methylation analysis. Acid hydrolysis of the methylated derivative of the less soluble carrageenan (molar ratio galactose: 3,6-anhydrogalactose: sulphate 1.00: 0.50: 1.20) yielded major amounts of 2,6-di-O-methylgalactose (51.3 mol %), 4,6-di-O-methylgalactose (25.6%) and 4-O-methylgalactose (51.3mol%), 4,6-di-O-methylgalactose (25.6%) and 4-O-methylgalactose (13.4%). Minor quantities of 3-O-methylgalactose (4.6%) and 6-O-methylgalactose (3.2%) were found together with traces of 2,3,6- and/or 2,4,6-tri-O-methylgalactose, 2-O-methylgalactose and galactose. Oxidative acid hydrolysis produced 3,6-anhydro-2-O-methylgalactonic acid and 3,6-anhydrogalactonic acid in a molar ratio 3.5-4.0:1.0. The methylated derivative of the more soluble carrageenan (molar ratio galactose:3,6-anhydrogalactose:sulphate 1.00:0.04:1.43) gave on acid hydrolysis, 2,3,4,6-tetra-O-methylgalactose (4.6%), 2,3,6-tri-O-methylgalactose (4.2%), 2,4,6-tri-O-methylgalactose (10.7%), 4,6-di-O-methylgalactose (24.1%), 3,6-di-0-methylgalactose (8.0%), 2,3-di-O- methylgalactose (3.4%), 2,4-di-O-methylgalactose (4.6%), 2,6-di-O-methylgalactose (4.2%), 3-O-methylgalactose (19.5%),4-O-methylgalactose (9.6%),6-O-methylgalactose(3.1%),galactose (3.4%)and traces of 2-O-methylgalactose. © 1980.
Registro:
| Documento: | Artículo |
| Título: | Methylation analysis of carrageenans from the seaweed Iridaea undulosa |
| Autor: | Matulewicz, M.C.; Cerezo, A.S. |
| Filiación: | Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellon 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina |
| Palabras clave: | Gigartinaceae; Iridaea undulosa; methylation analysis: carrageenans.; seaweed |
| Año: | 1980 |
| Volumen: | 19 |
| Número: | 12 |
| Página de inicio: | 2639 |
| Página de fin: | 2641 |
| DOI: | http://dx.doi.org/10.1016/S0031-9422(00)83936-9 |
| Título revista: | Phytochemistry |
| Título revista abreviado: | Phytochemistry |
| ISSN: | 00319422 |
| CODEN: | PYTCA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319422_v19_n12_p2639_Matulewicz |
Referencias:
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- Rees, 340. The carrageenan system of polysaccharides. Part I. The relation between the ?- and ?-components (1963) Journal of the Chemical Society (Resumed), p. 1821
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- Lawson, Rees, Stancioff, Stanley, Carrageenans. Part VIII. Repeating structures of galactan sulphates from Furcellaria fastigiata, Gigartina canaliculate, Gigartina chamissoi, Gigartina atropurpurea, Ahnfeltia durvillaei, Gymnogongrus furcellatus, Eucheuma cottonii, Eucheuma spinosum, Eucheuma isiforme, Eucheuma uncinatum, Aghardhiella tenera, Pachymenia hymantophora, and Gloiopeltis cervicornis (1973) Journal of the Chemical Society, Perkin Transactions 1, 1, p. 2177
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- Penman, Rees, Carrageenans. Part IX. Methylation analysis of galactan sulphates from Furcellaria fastigiata, Gigartina canaliculate, Gigartina chamissoi, Gigartina atropurpurea, Ahnfeltia durvillaei, Gymnogongrus furcellatus, Eucheuma isiforme, Eucheuma uncinatum, Aghardhiella tenera, Pachymenia hymantophora, and Gloiopeltis cervicornis. Structure of ?-carrageenan (1973) Journal of the Chemical Society, Perkin Transactions 1, 1, p. 2182
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Citas:
---------- APA ----------
Matulewicz, M.C. & Cerezo, A.S. (1980) . Methylation analysis of carrageenans from the seaweed Iridaea undulosa. Phytochemistry, 19(12), 2639-2641.http://dx.doi.org/10.1016/S0031-9422(00)83936-9
---------- CHICAGO ----------
Matulewicz, M.C., Cerezo, A.S. "Methylation analysis of carrageenans from the seaweed Iridaea undulosa" . Phytochemistry 19, no. 12 (1980) : 2639-2641.http://dx.doi.org/10.1016/S0031-9422(00)83936-9
---------- MLA ----------
Matulewicz, M.C., Cerezo, A.S. "Methylation analysis of carrageenans from the seaweed Iridaea undulosa" . Phytochemistry, vol. 19, no. 12, 1980, pp. 2639-2641.http://dx.doi.org/10.1016/S0031-9422(00)83936-9
---------- VANCOUVER ----------
Matulewicz, M.C., Cerezo, A.S. Methylation analysis of carrageenans from the seaweed Iridaea undulosa. Phytochemistry. 1980;19(12):2639-2641.http://dx.doi.org/10.1016/S0031-9422(00)83936-9
