One of the most important factors that has a significant impact on the health of the population of the Republic of Kazakhstan is a violation of the diet due to insufficient consumption of full–fledged proteins, vitamins, macro- and microelements and their irrational ratio. In Kazakhstan, grain crops are produced in large volumes, but there is no production of beverages based on vegetable raw materials, although the production of vegetable milk is already widespread throughout the world. The use of local vegetable raw materials from different regions of Kazakhstan in the production technology of grain milk drinks is an urgent and promising direction in the food industry. The article presents the results of a study of the quality of oats of breeding varieties "Duman", "Arman" and "Bityk". During the study, the physicochemical, technological properties and safety indicators of oat samples were evaluated. All the studied samples of oat grains in terms of safety meet the requirements of the Technical Regulations of the Customs Union "On grain safety". The scientific data obtained during the implementation of the project will become the basis for the creation of new grain "milk" drinks enriched with Omega-3 polyunsaturated fatty acids. The result of the implementation of this research will be the expansion of the range of beverages for healthy and safe nutrition of the population.

The object of this study was cereal drinks fortified with Omega-3 polyunsaturated fatty acids: rice (product 1), oat (product 2), buckwheat (product 3). The purpose of the research was to optimize technological parameters in the production of such beverages. A mathematical model was built in the form of three regression equations describing the influence of grinding size (K), roasting temperature (Т), and roasting duration (t) on three output variables: oat, buckwheat, and rice protein content. Statistical analysis of the obtained equations showed that they are adequate in the selected area of planning: K=0.66–2.34 mm, T=133–217 °С, t=3.3–11.7 min. Studies were conducted to determine quality indicators, chemical composition, biological and nutritional value of the developed cereal drinks, in comparison with the control version. It has been established that the content of fatty acid composition of cereal drinks differs markedly. The minimum share of saturated fatty acids was established in product No. 3, without fortification – 10.43 %. The content of polyunsaturated fatty acids ranged from 82.09 % (product 1) to 89.57 % (product 3). The highest omega-3 content was found in product 2, with fortification – 1.34 %, and the lowest – in product 1, without fortification – 0.27 %. The introduction of a filler in cereal drinks made it possible to add protein, thereby increasing the biological value. According to the content of essential amino acids, the devised product is characterized by a high content of essential amino acids, exceeding the FAO/WHO ideal protein scale, which allows us to draw a conclusion about the high biological value of the developed product. The analysis of the mathematical model built established that an increase in the coarseness of grinding leads to a decrease in the protein content in the entire investigated range of values of this factor