The invention relates to a preparation method for a grape spice. The preparation method comprises taking raisin as a
raw material, firstly immersing in deionized water for 9-12 h, then adding
cellulase accounting for 0.3-0.6% by
mass of the
raw material and beta-
glucosidase accounting for 1-3% by
mass of the
raw material for enzymolysis; performing twice extraction on the
slurry subjected to enzymolysis by using
petroleum ether, and then performing reduced-pressure
distillation, so as to obtain a concentrate; and performing
water extraction on the
slurry subjected to
petroleum ether extraction, so as to obtain a water-extraction concentrate, adding
xylose,
alanine and
phenylalanine into the water-extraction concentration for mixing, wherein the ratio of the water-extraction concentration,
xylose,
alanine and
phenylalanine is 10:0.8-2:0.3-0.7:0.6-1.0; and performing
maillard reaction to obtain a
maillard reaction product, and finally mixing the
maillard reaction product with the concentrate subjected to reduced-pressure
distillation in the above step, so as to obtain the grape spice. The preparation method is simple, the steps are easy to operate, the added beta-
glucosidase is capable of generating
phenylethyl alcohol,
nerol and other
aroma substances, the raw material
utilization rate is improved, and multiple new fragrance substances are generated through the reaction. The grape spice obtained by employing the preparation method is rich in note, and the fragrance is natural and mellow, stable and lasting.