Grain compositions containing pre-biotic isomalto-oligosaccharides and methods of making and using same
Methods for the production of substrate, tuber, and grain compositions containing isomalto-oligosaccharides are described. The methods comprise (a) contacting a substrate, tuber or grain containing ungelatinized starch with a maltogenic enzyme and a starch liquefying enzyme to produce maltose; (b) contacting the maltose with a transglucosidic enzyme, wherein the steps (a) and (b) occur at a temperature less than or at a starch gelatinization temperature; and (c) obtaining a substrate, grain or tuber composition having an enzymatically produced isomalto-oligosaccharide, wherein the oligosaccharide is derived from the grain. The maltogenic enzyme can be either exogenous or endogenous to the grain. The contacting steps can be sequential or concurrent. The present invention also describes flour, oral rehydrating solutions, beer adjuncts, food, feed, beverage additives incorporating the grain compositions made as described.
1. A method for making an isomalto-oligosaccharide substrate composition said method comprising:
(a) contacting an ungelatinized starch-containing substrate, with a maltogenic enzyme and a starch liquefying enzyme to produce maltose, said starch-containing substrate selected from the group consisting of a grain, a tuber and mixtures thereof;
(b) contacting said maltose with a transglucosidic enzyme, wherein said steps (a) and (b) occur at a temperature less than or at the gelatinization temperature of said starch; and
(c) obtaining an isomalto-oligosaccharide substrate composition having an enzymatically produced isomalto oligosaccharide, wherein said oligosaccharide is obtained from said starch-containing substrate.
2. The method according to claim 1 , wherein said steps (a) and (b) occur concurrently.
3. The method according to claim 1 , further comprising the step of drying said isomalto-oligosaccharide substrate composition.
4. The method according to claim 1 , wherein said starch-containing substrate is a grain selected from the group consisting of wheat, rye, barley, and malt.
5. The method according to claim 1 , wherein said starch-containing substrate is a grain selected from the group consisting of millet, sorghum and rice.
6. The method according to claim 1 , wherein said maltogenic enzyme is a beta amylase.
7. The method according to claim 1 , wherein said maltogenic enzyme is endogenous to said starch-containing substrate.
8. The method according to claim 1 , wherein said starch liquefying enzyme is an alpha amylase obtained from a Bacillus.
9. The method according to claim 8 , wherein said starch liquefying enzyme is obtained from Bacillus licheniformis or Bacillus stearothermophilus .
10. The method according to claim 1 , wherein said transglucosidic enzyme is a transglucosidase.
11. The method according to claim 10 , wherein said transglucosidase is obtained from Aspergillus.
12. The method according to claim 11 , wherein said Aspergillus is Aspergillus niger.