A preparation process of
probiotic yoghurt comprises the following steps: main materials and auxiliary materials are weighed according to a formula, the main materials comprise
raw milk and
whey protein powder, the weight ratio of the
raw milk is 900kg, and 2kg of
whey protein powder is added into every 1000kg of semi-finished products; uniformly mixing
raw milk,
whey protein powder, white granulated
sugar, fructo-
oligosaccharide and a compound emulsifying thickener to obtain a base material; and carrying out sensory detection and
alcohol test (72% vol) physicochemical index detection on the base material, and transferring to a
fermentation process after the base material is qualified. High-proportion raw milk is adopted as a base material, accurate addition of
whey protein powder is combined, dynamic adjustment is performed according to the
protein content, and it is ensured that the final product is balanced in
nutrition and stable in structure. Meanwhile, the white granulated
sugar and the fructo-
oligosaccharide are matched to provide a good
carbon source for the
lactic acid bacteria, and rapid propagation and
metabolism of the
lactic acid bacteria are promoted.