Studies on dextrans and dextranases. 2. The action of mould dextranases on modified isomaltodextrins and the effect of anomalous linkages on dextran hydrolysis

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Abstract
Extracellular dextranases are adaptively produced by strains of Penicillium lilacinum and P. funiculosum grown in media containing the virtually unbranched Streptococcus bovis dextran. The products of the action of the dextranases on S. bovis dextran are glucose, isomaltose and isomaltotriose, isomaltose being the main product. The dextranases readily hydrolyse virtually unbranched dextran, isomaltodextrins or modified isomaltodextrins containing not less than three glucosidic linkages, the hydrolysis being principally at glucosidic linkages other than the terminal ones. The number of reducing groups liberated from various dextrans by the dextranases is markedly lowered with increasing degree of branching of the dextran molecule.