The present application relates to the technical fields of
enzyme engineering and biological
feed additive, and discloses a preparation process of high-activity deoxynivalenol degrading
enzyme, which comprises the following steps: firstly, obtaining F428D
mutant deoxynivalenol degrading
enzyme concentrate in an acetate buffer
system; then, under the conditions of stirring and temperature reduction, adding
zinc acetate or
calcium acetate
aqueous solution into the concentrate to perform a coordination reaction; after the reaction is completed, adding
trehalose,
maltodextrin and
pyrroloquinoline quinone disodium salt as
protective agents, stirring and dissolving to form a to-be-dried enzyme solution; finally, setting the air
inlet temperature to 140-160 DEG C to perform
spray drying, and collecting
dry powder to obtain the product. The present application solves the problem that the enzyme is easy to be inactivated in
spray drying by using the
metal ion same
ion effect and coordination effect under the acetate buffer environment and combining with specific auxiliary embedding, and has the advantages of short
production cycle, low cost, high enzyme activity
recovery rate and the like, and is suitable for large-scale industrialized preparation.