The invention relates to a production method for spray-
drying Chinese yam
powder without using
sulfur to protecting color. The Chinese yam is prepared from fresh Chinese yam and is obtained by the steps of
microwave enzyme deactivation, shelling,
slicing, color protection, pulping,
grinding, vacuum condensation, homogenization, spray-
drying, vacuum packaging and
microwave sterilization. The Chinese yam
raw material is deactivated by
microwave at temperature of 60 DEG C,
cut to slice, and is soaked in
sulfur-free color protection liquid containing
phytic acid,
Ethylenediaminetetraacetic acid disodium,
vitamin C and
citric acid, the color protection liquid and the Chinese yam slice is pulped together and is milled by a
colloid mill, the Chinese yam
slurry is concentrated by a vacuum condensation equipment until the content of
solid is 15-25% and is homogeneously processed, homogenized liquid material is sprayed and dried by a centrifugal spray-
drying machine, the obtained Chinese yam
powder is packaged by vacuum and is sterilized by a
microwave sterilization equipment to prepare the
sulfur-free Chinese yam
powder product. The invention has high production efficiency and low cost, the produced Chinese yam product has good color, high safety and complete
nutrient composition, and can applied for field such as foodstuff,
medicine and cosmetic product.