## 3 Results and Discussion  
### Nutritional Potential of Sea Buckthorn and Rosehip Oils  
One of the basic quality features on the basis of which the nutritional value of fat can be determined is the composition of fatty acids. Sea buckthorn seed oil B1 contained 87.71% of unsaturated fatty acids, mainly represented by linoleic acid (57.78%) and oleic acid (28.83%) (Table 1). The remaining unsaturated fatty acids were palmitoleic acid, \(\alpha\)-linolenic acid, eicosenoic acid, and eicosatrienoic acid. The share of these acids did not exceed 1.5%. Saturated fatty acids determined at a level of 12.29% were mainly represented by palmitic acid (8.17%) and stearic acid (3.78%). The share of other saturated acids, such as myristic and arachidonic acids, did not exceed 1%. The content of unsaturated fatty acids in sea buckthorn B2 oil was 79.21%, including 40.14% of linoleic acid, 23.19% of oleic acid, and 15.09% of palmitoleic acid. The analyzed oil contained 20.79% of saturated fatty acids, including 17.6% of palmitic acid and 2.64% of stearic acid. The analyzed oil also contained trace amounts of myristic and arachidonic acids, not exceeding 1%. According to [PERSON] et al. (2020), the content of fatty acids in sea buckthorn oils differed significantly depending on the part of the plant from which the oil was pressed. The authors report that the palmitoleic, palmitic, and oleic acids were the dominating fatty acids in the pulp oils, whereas the linoleic and \(\alpha\)-linolenic acids were the main ones in the seed oils. This may explain the differences in the content of fatty acids in the analyzed oils because B1 oil was pressed from seeds, while B2 oil was pressed from pulp. The observed differences mainly concern the content of linoleic, palmitic, and palmitoleic acids. B1 oil was characterized by approximately 18% higher linoleic acid content than B2 oil. B2 oil contained approximately twice as much saturated palmitic acid in comparison to B1 oil. Palmitoleic acid was also detected in the B2 oil in an amount of 15.09%, which is characteristic of oils obtained from the pulp [27]. In both tested oils similar contents of oleic and stearic acids were detected. Rosehip oil R1 was rich in unsaturated fatty acids, the content of which was 92.3% of all fatty acids, including 75.5% of polygenic acids (Table 1). The dominant unsaturated fatty acids in this oil were linoleic acid (49.37%), \(\alpha\)-linolenic acid (26.02%), and oleic acid (16.02%). Among saturated fatty acids, the most abundant were palmitic acid--4.3%, stearic acid--2.44%, and arachidonic acid--approximately 1%. The content of other fatty acids was as follows: palmitoleic, \(\gamma\)-linolenic, eicosenoic, eicosaidenoic, and eicosatrienoic fatty acids did not exceed 1%. R2 rosehip oil was also rich in unsaturated fatty acids, which constituted 87.64% of all fatty acids, including 60.97% of linoleic acid. The second unsaturated fatty acid with the highest share was oleic acid (24.99%). The remaining unsaturated fatty acids: palmitoleic, margaroleic, \(\gamma\)-linolenic, \(\alpha\)-linolenic, eicosenoic, eicosadienoic, and eicosatrienoic acids accounted for a total of approximately 2%. Saturated fatty acids accounted for 12.36%. The analyzed rosehip oils were characterized by a similar total content of unsaturated acids, but they differ in the content of individual fatty acids. R1 oil contained a significantly higher amount of \(\alpha\)-linolenic acid (26.02%), while R2 oil contained only 0.44% of this acid. It was also noticed that R2 oil was characterized by a significantly higher content of linoleic acid. The obtained results only for R1 oil correspond to those obtained by [PERSON] et al. [5]. The authors determined the content of unsaturated fatty acids at the level of 89.7-91.5%, including the content of linoleic acid (44.4-51.7%), \(\alpha\)-linolenic acid (21.5-31.8%) and oleic acid (14.7-16.3%).