Preparation of psicose syrup and application of psicose syrup in candy production

The invention relates to the technical field of psicose, in particular to preparation of psicose syrup and application of the psicose syrup in candy production, and the psicose syrup is simple in process, short in time consumption, high in reaction speed and high in efficiency. When the psicose is applied to the candies, the calorie of the candies can be reduced, and the taste degree of the candies can be increased; the preparation method comprises the following steps: S1, preparing a 30% glucose aqueous solution, adding epimerase, and adjusting the pH value to 2.5-5.0; s2, the mixed solution is heated, and after a heat preservation reaction is conducted for a period of time, a solution containing psicose is obtained; s3, after the reaction is finished, carrying out centrifugal filtration on a reaction solution, extracting supernate, and removing precipitates; s4, carrying out electrodialysis desalination refining on the supernatant to obtain a desalted refined solution; and S5, carrying out vacuum concentrat