Baker's yeast glucan has been partly hydrolysed with acid, and the products have been fractionated on charcoal-Celite. Eight mono-, di-, tri-, and tetra-saccharides, considered to be fragments of the glucan molecule, have been isolated and identified. These are D-glucose, gentiobiose, laminaribiose, gentiotriose, 6-O-β-laminaribiosylglucose, laminaritriose, 3-O-β-gentiobiosylglucose, and gentiotetraose. It is concluded that the glucan is a linear polymer of β-D-glucopyranose in which 1:3- and 1:6-linkages are arranged at random or in sequences such that a group of at least three 1:6-linkages is flanked on either side by 1:3-linkages. Periodate-oxidation results suggest that the combined proportion of non-reducing end groups and 1:6-links is 1 per 10 glucose residues.
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