Patent ID: 7687248

Claim:
A method to produce an insoluble resistant starch product from an ungelatinized, unhydrolyzed insoluble native starch, wherein said method comprises the following sequential steps (a) through (c): (a) preparing an aqueous slurry of the ungelatinized, unhydrolyzed insoluble native starch; (b) incubating the slurry at a temperature from about 40° C. to less than 60° C. for a time from about 2 hours to about 4 hours with an effective amount of a debranching enzyme to hydrolyze at least some of the 1,6-glucosidic bonds of the native starch molecules; and (c) isolating the insoluble resistant starch product from the aqueous slurry; wherein: the native starch is neither gelatinized nor hydrolyzed at any time prior to step (b); the isolated resistant starch product produced thereby exhibits a pasting temperature and a peak viscosity that are within 25% of that exhibited by the native starch; the isolated resistant starch product produced thereby exhibits a resistant starch temperature peak from about 116° C. to about 125° C. in a heating profile as measured by differential scanning calorimetry; and the isolated resistant starch product produced thereby contains from about a three-fold to about a twelve-fold increase in percentage of starch molecules that are resistant to alpha-amylase digestion as compared to the native starch.