The invention belongs to the technical field of
food chemistry and functional additives, and particularly relates to a high-efficiency natural
sugar substitute in low-
sugar food and a preparation method of the high-efficiency natural
sugar substitute. The substitute is prepared from modified
gallic acid and 2-hydroxy-1, 3-
propane diketone as main raw materials, and Arabic gum,
maltodextrin,
sodium citrate,
xanthan gum and a base catalyst as auxiliary materials. The modified
gallic acid is prepared by performing catalytic
glycosylation on
gallic acid through
glucosyltransferase and performing graft modification on the glycosylated gallic acid and L-
lysine, and a
glycoside-
amide bifunctional structure is formed. In the preparation process, a stable composite
system is obtained through condensation, crosslinking and
spray drying. Through synergistic reaction of enzymatic
glycosylation and
amino acid grafting, the product is remarkably improved in sweet softness,
thermal stability,
solubility and
oxidation resistance, can be widely applied to low-sugar foods, beverages and
functional health-care products, and has the advantages of being natural, safe and stable in
flavor.