Primary, the author places special emphasis on the study of traditional technologies for processing of geophytes. Modern development trends in biotechnology demand of expansion of the raw material base. The increase in needs medicine, food and feed industries in biologically active substances pay attention to new unconventional sources of renewable raw materials. From this perspective, higher aquatic plants Zostera noltii and Potamogeton perfoliatus L. can be considered as a perspective object due to its high content of unique biologically active substances with different properties. Rationale of choosing of plant material and identifications of optimum performance and operational conditions for the production of biologically active substances: alcohol extraction in the mixer at room temperature limited to 7-10 days. Studied the organoleptic, physicochemical and microbial properties of end products – aqueous-alcoholic extracts of hydrophytes. Experimentations (UV spectrophotometric analysis, thin layer chromatography, mass spectrometry) indicate that the composition of plants and extracts contains different biologically active substances. The high content of quercetin and pigments in the extracts of Z. noltii and Potamogeton perfoliatus L. shows the future use of hydrophytes in the Volga river and the Northern Caspian sea as an additional natural source of flavonoids and antioxidants. Therefore, plant preparations (aqueousalcoholic extracts of zostera and pondweed) are combinations of various compounds, which have a high biological activity with different properties: adsorptive capacity, antioxidant and antimicrobial activity. Products of studied plants after extraction with water-alcohol can be used in the food industry as a source-native with minerals, carbohydrates, protein, vitamins, flavonoids, terpenoids, alcohols, aliphatic acids and etc. Find an opportunity of use of biologically active substances from eelgrass and pondweed and herbal precipitate after extraction.

1. 1 Gromov V.V. Higher-plant aquatic and coastal vegetation of the Northern Caspian: Volga foredelta, Kalmyk and Kazakh Coasts [Journal of Siberian Federal University], 2010, vol. 3, pp. 250-266. (In Russ.).

2. 2 Astafieva O.V., Novichenko O.V., Egorov М.А. The possibility of use of extracts from higher hydrophytes and geophytes of the Astrakhan region for the needs of cosmetology [Biochemistry and Biotechnology: Research and Development Binding], 2012. pp. 147-152.

3. 3 Suvorova T.F., Bisenova A.R., Mukatova M.D. Research of cellular structures of water plants of the Volgo-Caspian basin for the purpose of their use as industrial raw materials. Vestnik AGTU [Newsletter of ASTU], 2010, vol. 3, no. 26, pp. 158-166. (In Russ.).

4. 4 Podkorytova А.V. Morskie vodoroslimakrofity i travy [Seaweeds – macrophytes and seagrasses]. Moscow, VNIRO, 2005. 175 p. (In Russ.).

5. 5 Sukhenko L.Т. Biologically active substances of some plants and mechanisms its antibacterial activity. Estestvennye nauki [Natural sciences], 2010, vol. 3, pp. 166-176. (In Russ.).

6. 6 Hengrui Zheng, Xun Sun, Nan Guo, Ronggui Li. Evaluation of antibacterial and antioxidant activity of extracts of eelgrass Zostera marina Linnaeus [African Journal of Microbiology Research], 2014, vol. 8, no. 23, pp. 2315-2321