Production of isoamylase by Escherichia intermedia

A culture of a coliform bacteria isolated from soil produced isoamylase when grown in peptone-maltose-salts broth. The enzyme preparation was partially purified. Its similarity with isoamylase produced by Aerobacter aerogenes was established by studying its action upon various polysaccharides. A study of the organism producing isoamylase showed that it differed from A. aerogenes in some of its physiological properties. This organism was identified as Escherichia intermedia from morphological and cultural characteristics.

Polysaccharide produced by the genus Pullularia. II. Trans-alpha-glucosidation by acetone cells of Pullularia

Acetone cells of Pullularia sp. were incubated with maltose, and the saccharides produced were fractionated on a charcoal column. The fractions were subjected to paper-chromatographic analysis and enzymatic assay. By these methods, the saccharides have been shown to include glucose, maltose, maltotriose, panose, and the lower members of glucose polymers containing the 1,4- and 1,6-alpha-glucosidic linkages, but neither isomaltose nor dextrantriose. The use of glucose oxidase results in the formation of the higher members of glucose polymer.