Transglucosidase activity of rumen strains of Streptococcus bovis: structure of the dextran produced from sucrose

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Abstract
The polysaccharide produced by rumen strains of S. bovis from sucrose at 37[degree] C in the presence of CO2, yielded only glucose on hydrolysis. Isomaltose was isolated and identified as the sole disaccharide produced by partial acid hydrolysis of the polysaccharide, which is therefore a dextran. On the evidence of periodate oxidation, infrared spectra ind optical rotations it is concluded that the dextrans produced by 6 strains of S. bovis contain only or-1:6-glucosidic linkages and are therefore unbranched. Growth of one strain of S. bovis at a lower temperature (28[degree] C) or in a medium containing added Mg still produced an unbranched dextran.