The invention discloses a preparation method of fruit-vegetable crisps applying
trehalose. The method comprises the following steps: performing screening on the raw materials, cleaning, steam de-enzyming and soaking in
citric acid cold water to obtain pretreated raw materials; performing centrifugal
dehydration on the pretreated raw materials to obtain pre-impregnated raw materials; uniformly mixing the pre-impregnated raw materials with impregnation liquid according to the production requirements, and impregnating in a vacuum impregnation
machine for good taste, wherein the impregnation liquid is prepared from
trehalose and an emulsifier; sequentially performing pre-cooling, freezing, vacuum oil-bath
dehydration and centrifugal oil removal on the impregnated raw materials to obtain the fruit-vegetable crisps. The impregnation technology provided by the invention adopts the
trehalose and the emulsifier, maintains original color of the food and avoids shrinking of the raw materials; moreover, rehydration is fast, the tissue structure of original food is maintained, the blood glucose reaction is steady, and the
sweetness quality of the food is improved; moreover, the cariogenicity islow. In the treatment of raw materials, a centrifugal
dehydration treating technology is added before the impregnation technology, then the yield of semi-finished products is increased by 15%, and the production efficiency is improved.