Polysaccharides seaweed

Detergent Methods. The neutral detergent fiber (NDF) and acid detergent fiber (ADF) methods (2), later modified for human foods (13), measure total insoluble plant cell wall material (NDF) and the cellulose—lignin complex (ADF). The easily solubilized pectins and some associated polysaccharides, galactomaimans of legume seeds, various plant gums, and seaweed polysaccharides are extracted away from the NDF. They caimot be recovered easily from the extract, and therefore the soluble fiber fraction is lost. 

This material is another seaweed polysaccharide. The name is believed to be of Irish origin. The ability of certain seaweeds to gel large... 

The function of the sulfate residue in these polysaccharides is unknown but the suggestion has been made that just as starch is synthesised from D-glucose 1-phosphate by the action of phosphorylase, so the seaweed polysaccharides are formed from the appropriate sugar sulfate by reaction with a sulfatase. ... 

Seaweed polysaccharides form especially complex structures132,133 with residues of D-xylose, L-fucose, and hexuronic acids, and with sulfate groups, and, apparently, covalently bound protein. The results of methylation studies133 indicated that doubly and, possibly, triply substituted fucopyranosyl residues were present. 

L-Galactose is a common constituent of seaweed polysaccharides [see T. Mori, Advances in Carbohydrate Chern., 8, 316 (1954)], but it has been found previously only in linseed mucilage [E. Anderson and H. J. Lowe, J. Biol. Chern., 168, 289 (1947)] amongst land plants. 

The anionic groups Most of the seaweed polysaccharides with antiviral activity carry only sulfate as their anionic group. Nevertheless, in the case of fucoidans both sulfate groups and uronic acids are present. Sulfated seaweed polysaccharides with degrees of sulfation lower than 20-22% usually do not show activity, unless other structural factors compensate the sulfate deficiency. 

Anhydro sugars occur as components of seaweed polysaccharides such as alginate and agar. Sugar acids occur in the pectic sub-... 

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