Title of article :
The system of xylogalactans from the red seaweed Jania rubens (Corallinales, Rhodophyta) Original Research Article
Author/Authors :
Diego A. Navarro، نويسنده , , Carlos A. Stortz، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2008
Pages :
10
From page :
2613
To page :
2622
Abstract :
The main acidic polysaccharides from the red seaweed Jania rubens share the general characteristics of corallinans (agar-like xylogalactans). After fractionation by ion-exchange chromatography, ten fractions were separated and characterized by sugar composition, other components, methylation, ethylation, desulfation–methylation, and NMR analyses. The main group of fractions carry the agaran disaccharidic repeating unit [→3)-β-d-Gal-(1→4)-α-l-Gal-(1→] substituted mainly on O-6 of the β-d-Gal unit by β-xylosyl side stubs, and less with sulfate or methoxyl groups, and also on O-2 of the α-l-Gal unit with methoxyl or sulfate, or less on O-3 of the same unit with methoxyl groups. These features are somehow common to the four members of the order already studied. However, a sugar uncommon to the order appears in moderate proportions for all the fractions: it is 3,6-anhydro-l-galactose (partly sulfated or methoxylated on O-2) replacing the l-Gal unit. Besides, several other structural features never found in the order (and uncommon in any polysaccharide) appear in some minor fractions: the presence of side stubs of 2,3-di- and 3-O-methyl-d-galactose, and also part of the 3-O-methyl-l-galactose acting as side stubs. These results show that, although the main features of the corallinean xylogalactans are common to all the species studied, each one has minor characteristics of its own.
Keywords :
Sulfated galactans , Corallinales , Xylogalactans , Jania , 3 , 6-anhydrogalactose , Agaran
Journal title :
Carbohydrate Research
Serial Year :
2008
Journal title :
Carbohydrate Research
Record number :
965594
Link To Document :
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