Abstract
The volatile pyrolysates of galactan sulfates have been examined by capillary gas chromatography-mass spectrometry. Electron impact and chemical ionization techniques have been employed to determine the molecular structures of major pyrolysis products. Agarose, well-characterized agars, carrageenan and model saccharides having mono-O-methyl and sulfate ester functional groups have been pyrolyzed. Pyrolytic pathways of some of the galactans are discussed. Results show that initial glycosidic bond cleavage occurs followed by formation of unique pyrolysis products, e.g., anhydrosugars, characteristic of the individual polymeric units. The pyrolytic patterns of the saccharides change markedly with increasing amounts of sulfate substituents.
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