The dextran like polymer GtfKg3 is formed using sucrose by the glucanotransferase GtfKg3 of Lactobacillus fermentum strain Kg3. The branched compound contains mainly α(1→6) and a minor amount of α(1→3) linkages. Glucans produced by glucanotransferase enzymes are potentially prebiotic, stimulating the gastrointestinal tract.

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