Abstract
Urospora wormskioldii and Codiolum pusillum are different life forms of this arctic alga. They both metabolise d-glucose, d-fructose, sucrose, myo-inositol, glyceric acid, and malto-oligosaccharides. In Codiolum, 1,3-linked d-glucose and l-rhamnose oligosaccharides were also present. The major polysaccharide extracted by water from both forms is a polydisperse, sulphated glucuronoxylorhamnan. Polysaccharides containing 1,3-, 1,4-, and triply linked d-glucose residues were also isolated from the aqueous extracts. Pure amylopectin-type polysaccharides were isolated from acid extracts of both forms of the weed. The major difference between the two forms was the presence in Codiolum of a sulphated (1→4)-linked β- d-mannan branched at C-6 and sulphated at C-2. The similarities and differences of the carbohydrates with those of Urospora penicilliformis and other green seaweeds are discussed.
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