In this work, experimental studies of water extraction of the barren part of sea buckthorn, namely bark, wood, leaves and shoots, have been carried out. Analyzed the yield of water-soluble substances relative to the feedstock, depending on the temperature and duration of the process. It was found that to obtain the maximum possible amount of water-soluble substances during the extraction of leaves, bark and woody parts of sea buckthorn, a temperature of 40°C is sufficient. To extract the maximum possible amount of biologically useful substances from sea buckthorn shoots, a higher temperature and a longer extraction time are required. The diffusion coefficients were calculated for different parts of the sea buckthorn on the basis of the body shape coefficient and the value of the rate of the regular mode of the extraction process. The greatest value of the diffusion coefficient is observed in the sea buckthorn bark, which is characterized by high porosity. The diffusion coefficient in the leaves has the lowest value, which is explained by the closure of the pores due to the fine size of the raw material and its rapid drying during transportation and storage.

The healing properties of extracts from sea buckthorn fruits have been confirmed by numerous studies, however, the infertile parts remaining after harvesting or after pruning young trees also contain valuable components. Leaves, bark, shoots and woody parts of sea buckthorn are very promising raw materials for the extraction of biologically active substances. The introduction of non-waste technologies, issues of resource conservation, the search for rational ways to isolate valuable components from the non-fruit part of sea buckthorn determined the relevance of this study. The choice of the optimal method for the extraction of non-fruit parts of sea buckthorn is aimed at accelerating heat and mass transfer processes and increasing the rate of diffusion extraction of biologically active substances. The paper reflects the results of experimental studies of traditional aqueous extraction of non-fruit parts of sea buckthorn, namely leaves, bark, shoots and wood, and the results of intensification of extraction by preliminary freezing of the feedstock. The influence of the raw material freezing rate on the size of the formed ice crystals is analyzed. It has been established that at a freezing rate of 0.1-1 cm/ h, large ice crystals form in the intercellular space of plant raw materials, causing mechanical damage to cellular structures and contributing to better leaching of biologically active substances, which is confirmed by experimental studies.