[Instant drinks based on extracts of Japan sea brown algae and fruit and berry juices as functional products].

Nowadays, there is a need to create functional drinks that not only normalize the water-electrolyte balance, but also correct and optimize the chemical structure of the diet. The basis for the production of dry drinks can be fruit and berry juices, extracts of herbal raw materials, including algae, etc. The aim of the study was to develop dry drinks based on dry extracts of brown algae (Costaria costata and Undaria pinnatifida) and concentrated fruit and berry juices and to evaluate the content of biologically active substances in them, as well as the antioxidant properties of the resulting drinks. Material and methods . Brown algae of the Far Eastern region Costaria costata and Undaria pinnatifida were used as objects, from which dry hydrothermal extracts were obtained, as well as dry drinks based on these extracts (21-26%) and concentrated fruit and berry juices of black currant and blueberry (31-37%). The content of iodine was determined by titrimetric method, fucoidan, the sum of phenolic compounds, flavonoids, catechins - by spectrophotometric method, vitamin C - titrimetrically, anthocyanins - by pH-differential spectrophotometry. Identification of phenolic compounds was carried out by HPLC. The antiradical properties of beverages were evaluated by the ability to interact with the stable 2.2-diphenyl-1-picrylhydrazyl free radical in vitro spectrophotometrically. Results . Dry hydrothermal extracts of C. costata and U. pinnatifida brown algae are characterized by a high content of bioactive substances, the main of which are fucoidan and iodine. The fucoidan content in C. costata extract was 1.7 g/100 g, in U. pinnatifida extract - 0.5 g/100 g; the iodine content was 0.0036 and 0.0028 g/100 g, respectively. The content of phenolic compounds was at least 205 mg of tannic acid per 1 g, the main compounds were syringic acid and epicatechin, salicylic and coumaric acids, as well as chlorogenic, caffeic, 2.5-dihydroxybenzoic, ferulic acid and gallates of epigallocatechin and epicatechin. The developed drinks based on dry extracts of C. costata and U. pinnatifida brown algae (21-26%) and concentrated blueberry and blackcurrant juices (31-37%) (the rest is powdered sugar) are a food system enriched with bioactive substances. The content per 1 serving of drinks (10 g per 200 ml) of iodine was high and amounted to 70-75 mcg, phenolic compounds - about 250 mg, vitamin C level was maximum in a drink with black currant (41-44 mg), fucoidan content ranged from 79 to 84 mg. The resulting dry drinks satisfy the daily physiological requirement in iodine by at least 40%, in vitamin C - by at least 30% when consuming 1 serving. The radical binding activity of all the studied beverages was quite high and amounted to 91.1-96.5%. The drink with blueberry juice and C. costata extract showed maximum antiradical properties. Conclusion . The developed dry soft drinks based on dry extracts of C. costata and U. pinnatifida brown algae and concentrated juices of black currant or blueberry contain a wide range of bioactive compounds. They can be attributed to functional products due to the high degree of satisfaction of the daily physiological requirement of the human body in vitamin C and iodine and are characterized by high antiradical properties.