## 1 Introduction
Fruit pomace, e.g., from chokeberry, rosehip, blackcurrant or strawberries, can be used as an ingredient in fruit teas to impart antioxidant properties to the composition. In confectionery products, the addition of expeller can successfully provide a source of precious fiber. Apple pomace, due to its chemical composition, is a good breeding ground for lactic bacteria. [PERSON] et al. [8] indicate that even the extraction meal, i.e., blackcurrant seeds after pressing the oil, contained valuable ingredients. Researchers identified essential amino acids, iron and fiber in amounts similar to that of fresh pomace. Black currant seeds, which are the primary waste when obtaining juice from these fruits, consist of approximately 20.3% protein, 55.8% carbohydrates, 1.6% minerals and 14.8% valuable fat. The fatty acids present in the oil are mainly unsaturated: 73.6% are polyunsaturated and 17.3% are monounsaturated. Among polyunsaturated fatty acids, linoleic acid constitutes as much as 47.8% [9]. Black currant seed oil, compared to oils obtained from red currant or gooseberry seeds, is characterized by the highest content of vitamin E, i.e., 1716 mg/kg. At the same time, it contains the most alpha-tocopherol (34.8% of detected tocopherols), which is the most active among the tocopherols [10]. Supplementation with black currant seed oil, according to [PERSON] et al. [11], reduces the level of LDL cholesterol more effectively than supplementation of the most famous fish oil. Strawberry seeds can consist of up to 20% fat in dry matter. The oil obtained from them is characterized by a high content of polygenic (74.5%) and monoenoic (17.9%) fatty acids. Among them, three main fatty acids can be distinguished: linoleic acid, which constitutes approximately 40% of total fatty acids, alpha-linolenic acid--approximately 34%--and oleic acid--approximately 17%. It should be noted that the high content of alpha-linolenic acid makes this oil a unique source of valuable omega-3 acids [12]. [PERSON] et al. [13] detected a significant amount of gamma-tocopherol, i.e., approximately 49 mg/100 g, small amounts of other tocopherol isoforms and trace amounts of toctorienols in strawberry seed oil. Cranberry seed oil contains approximately 30-35% alpha-linolenic acid, 35-40% linoleic acid and 20-25% oleic acid. Compared to oils from conventional raw materials, it is therefore characterized by a unique share of omega-3, omega-6 and omega-9 fatty acids [14]. Due to its composition, cranberry seed oil can be potentially used both in the food industry and in the pharmaceutical, cosmetics or perfumery industries. It contains a particularly high content of beta-sitosterol, which is a factor that lowers the content of lipoproteins in the blood; the presence of campesterol and stigmasterol has also been confirmed. It can be used in the treatment of eczema and rashes and the production of face creams, bath oils, toothpastes, hair products and antiperspirants. [PERSON] et al. [15] also noted the impressive ability of cranberry seed oil to chelate Fe\({}^{2+}\) ions. Metals can act as catalysts in food oxidation reactions, and chelating agents prevent these chain reactions. Cranberry seed oil contains 0.341 g/100 g of alpha-tocopherol and 0.110 g/100 g of gamma-tocopherol [16]. It should be noted that gamma-tocotrienol (1.235-1.50 g/100 g) is the dominant tocochromanol, which is unique compared to other oils obtained from fruit seeds [14]. The present study aimed to accurately evaluate the quality of black currant, cranberry and strawberry seed oils, including important parameters such as: composition and distribution of fatty acids in triacylglycerol structure, oxidative stability and melting profile. Additionally, heath indices of atherogenicity, thrombogenicity and hypocholesterolemroline ratio were assessed to provide information on the impact of fatty acids present in oils on human health, regarding the risk of atherosclerosis and the likelihood of blood clots, atheroma and thrombus occurrence.