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.
Referencias:
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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