The invention provides a preparation method of pulp with high fruit
sugar content, which comprises the following steps: (1) soaking dried sweet potatoes or rice corns by water at the
room temperature,
grinding the dried sweet potatoes or the rice corns into pulp, and filtering the pulp by a filter
sieve of more than 70 meshes; (2) regulating the pH value of the pulp to 5.5 to 5.6 by
phosphoric acid, adding water to regulate the
mass concentration to 30 to 35 percent, adding
calcium chloride accessory agents and high-
temperature resistance amylase, and uniformly stirring and mixing the mixture; (3) carrying out spraying
liquefaction by the mixed pulp at 110 to 113 DEG C, reducing the temperature to 85 to 90 DEG C in 5 to 20 minutes, and then, liquefying the materials for 35 to 45 minutes; (4) carrying out
filtration and deslagging; (5) adding
maltogenic amylase and debranching
enzyme for saccharification for 45 to 55 hours, and then, carrying out
enzyme extinguishment and material
discharge; (6) carrying out decolourization and
filtration; (7) adding
sodium phosphate solution into decolourization material liquid for regulating the pH value to 6.0 to 6.7, then, adding glucose
isomerase for
isomerization for 15 to 20 hours, and next, deactivating the glucose
isomerase; (8) carrying out the
ion exchange treatment; (9) concentrating obtained materials; and (10) carrying out
package. The pulp with high fruit
sugar content prepared by adopting the method of the invention has the advantages that the fruit
sugar content in dry materials reaches 55 to 58 percent, and the
starch conversion rate reaches 90 to 97 percent.