Preparation of dry lactose protein-lipid concentrate of buttermilk

Complex processing of buttermilk in lactose protein concentrates is relevant. Free-lactose protein-lipid concentrates are intended for further industrial processing. They can be used as protein enrichment or protein basis in the production of food products. In the work the technological scheme of obtaining a dry free-lactose protein-lipid concentrate of buttermilk. The non-lactic protein-lipid concentrate was received by membrane methods and dried in the dryer of the fountain layer of inert carriers. The rational mode of drying of a liquid free-lactose protein-lipid concentrate in the dryer of the fountain layer with inert carriers is determined: the temperature of the air at the inlet is 125…130 °C; product temperature at the outlet – 55…60 °C; air velocity at the inlet – 15…20 m/s; mass fraction of dry substances in the inlet concentrate - not more than 20%; the final moisture content of the dry free-lactose protein-lipid concentrate of the buttermilk is 5.0%; inert carrier - fluoroplast in the form of cubes with the dimensions of the face 5 mm; the way of feeding the solution to the drying chamber - from below to the hanging layer of an inert carrier. The organoleptic, physico-chemical and microbiological parameters of the obtained dry free-lactose protein-lipid concentrate of the buttermilk were determined. Dry free-lactose protein-lipid concentrates of high protein content (81.03 ... 81.81%) provide an improvement in the protein without the addition of lactose to food products (mass fraction of lactose not more than 0.064%). When adding dry free-lactose protein-lipid concentrates to the formulation additionally added valuable minerals such as calcium, magnesium and phosphorus, which reduces the need for additional sources of these minerals. Determination of the bacteria of the group of intestinal sticks in 1.0 cm3 of a sample of dry free-lactose protein-lipid concentrate of the buttermilk indicates their absence in the investigated volume, which proves the correctness of all regimes of the main technological processes. According to microbiological data, the concentrate obtained meets the requirements of scientific and technical documentation