The invention discloses a whole grain
protein beverage and a preparation method thereof, and relates to a grain beverage. The whole grain
protein beverage comprises the following raw materials: oat, soybean,
naked barley, nut, filbert, pea, pinecone, red
kidney bean, white
sesame seed, corn, rice, millet, wheat, white granulated
sugar, a stabilizer and an enzymic preparation. The method comprises the following steps: adding water to boil after soaking the grains; obtaining glue milling liquid by a
colloid mill; carrying out heating and heat preservation, adding the enzymic preparation to obtain enzymatic
hydrolysate in a manner of enzymolysis; homogenizing and obtaining
serous fluid by a vibrating screen; evenly mixing the stabilizer and the white granulated
sugar; adding hot water to obtain a stabilizer solution; adding hot water to the white granulated
sugar to obtain syrup; injecting the
serous fluid, the stabilizer solution and the syrup into a blending tank; metering the volume by blend water to obtain a blending liquid; cooling the blending liquid to below 15 DEG C, and infiltrating into an ultra high-temperature instant sterilization
system; preheating the blending liquid; degassing the preheated blending liquid; homogenizing the degassed blending liquid; carrying out ultra high-temperature instant sterilization on the homogenized blending liquid; filling the blending liquid after ultra high-temperature instant sterilization; and then packaging the filled blending liquid.