The invention discloses a preparation method of
lotus seed
resistant starch, and belongs to the technical field of
lotus seed
processing. Comprising the following steps: S1, preparing
lotus seed
starch; s21, adding a proper amount of
distilled water into lotus seed
starch to prepare a
starch milk solution with a certain concentration, carrying out
hot pressing gelatinization, sequentially adding
pepsin and
pullulanase, carrying out sufficient enzymolysis, and carrying out high-temperature
enzyme deactivation; s22, adding
chitosan grafted with disulfide bonds into the milk solution subjected to
enzyme deactivation, and centrifuging and filtering after full reaction; s23, adding a
glutathione-magnetic
silicon dioxide
composite material into the milk solution filtered in the step S22, fully reacting in an
inert atmosphere, centrifuging, and filtering; and S24, refrigerating the milk solution filtered in the step S23, and then
drying, crushing, sieving and purifying to obtain the lotus seed
resistant starch. By improving the prior art and optimizing process parameters, high-yield and high-purity
resistant starch can be obtained, the yield is not lower than 62.72%, and the purity is not lower than 98.15%.