Development of a rational technology for producing anthocyanin dye from black rice

Biologically active substances – anthocyanins, obtained from certain types of vege-table raw materials, can be effectively used in the food industry. The purpose of this study is to develop a method for obtaining a dry form of black rice extract for its subsequent use as a func-tional additive and natural food coloring. The following research objects were considered: black rice; black rice extract with a dry matter concentration of 0.010–0.024 kg/kg; concentrated black rice extract with a dry matter concentration of 0.10–0.15 kg/kg (concentrate); black rice extract in the form of a fine powder (dry form) with a dry matter concentration of 0.95 kg/kg. To obtain ex-tracts, black rice of the Mulatka variety and black rice of the Southern Night variety were used. The analysis of scientific and technical literature and patent information on the research topic is carried out. Methods of extraction of anthocyanins from various raw materials and various meth-ods of intensification of the extraction of valuable components from vegetable raw materials have been studied. To obtain anthocyanins from black rice and use them in the food industry, it is ad-visable to develop a technology based on water extraction. In order to intensify mass transfer dur-ing extraction, it is proposed to use ultrasonic treatment of the extraction mixture and its circulat-ing mixing. The processes of ultrasonic extraction of anthocyanins from black rice and spray dry-ing of the obtained extract have been studied. A method for obtaining dry black rice extract based on a rational combination of interdependent processes of extraction mixture formation, ultrasound extraction, filtration, vacuum evaporation and spray drying is proposed. A machine and hardware scheme of the method is presented, which makes it possible to design an industrial enterprise or a production site for the production of a dry form of black rice extract for its subsequent use as a functional additive and natural food coloring.