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The profiles of tocopherols and tocotrienols (vitamin E) in the seed oils recovered from apple (Malus domestica Borkh.), canary melon (Cucumis melo L.), gooseberry (Ribes uva-crispa L.), grape (Vitis vinifera L.), Japanese quince (Chaenomeles japonica), pomegranate (Punica granatum L.), red currant (Ribes rubrum L.), sea buckthorn (Hippophae rhamnoides L.), and watermelon (Citrullus lanatus) by-products of the fruit industry were studied. The highest concentration of tocochromanols was found in pomegranate seed oil (398.73 mg/100 g) and the lowest in gooseberry seed oil (69.13 mg/100 g). The g and a homologues were the predominant forms of tocopherol and tocotrienol in all fruit seed oils studied. The pomegranate, canary melon, watermelon, gooseberry and red currants seed oils contained mainly gtocopherol (382.69, 63.08, 111.01, 60.35, and 156.39 mg/100 g, respectively). In the apple, sea buckthorn and Japanese quince seed oils, a-tocopherol was the predominant tocochromanol (58.77, 121.79, and 198.94 mg/100 g, respectively). High concentrations of tocotrienol homologes (g and a) (49.49 and 34.53 mg/100 g, respectively) were found only in grape seed oil. A significant correlation (r ¼ 0.994, p < 0.00001) between the total content of tocochromanols in the seed oils and scavenging of the free radical DPPH was found.Practical applications This study demonstrated that seed oils recovered from industrial fruit byproducts generated by the food industry are valuable source of tocochromanols. Therefore, fruit seed oils may be successfully applied to obtain new products rich in vitamin E for the food, pharmaceutical and cosmetic industries, with environmental sustainability benefits and a more effective use of harvested plant material.

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The profile of bioactive compounds (carotenoids, tocopherols, tocotrienols, phytosterols, and squalene) in oils recovered from the kernels of 28 plum varieties of hexaploid species Prunus domestica L. and diploid plums Prunus cerasifera Ehrh. and their crossbreeds were studied. Oil yields in plum kernels of both P. cerasifera and P. domestica was in wide ranges of 22.6-53.1 and 24.2-46.9% (w/w) dw, respectively. The contents of total tocochromanols, carotenoids, phytosterols, and squalene was significantly affected by the variety and ranged between 70.7 and 208.7 mg/100 g of oil, between 0.41 and 3.07 mg/100 g of oil, between 297.2 and 1569.6 mg/100 g of oil, and between 25.7 and 80.4 mg/100 g of oil, respectively. Regardless of the cultivar, β-sitosterol and γ-tocopherol were the main minor lipophilic compounds in plum kernel oils and constituted between 208.5 and 1258.7 mg/100 g of oil and between 60.5 and 182.0 mg/100 g of oil, respectively. Between the studied plum species, significant differences were recorded for δ-tocopherol (p = 0.007), 24-methylenecycloartanol (p = 0.038), and citrostadienol (p = 0.003), but they were insufficient for discrimination by PCA.