Native Oils from Apple, Blackcurrant, Raspberry, and Strawberry Seeds as a Source of Polyenoic Fatty Acids, Tocochromanols, and Phytosterols: A Health Implication

The oils from strawberry, blackcurrant, raspberry, and apple seeds were characterized by a high content of unsaturated fatty acids (90.8%, 88.6%, 94.0%, and 86.9%, resp.). Strawberry and raspberry oils had high levels of C18:2 (45.4% and 49.0%) and alpha C18:3 (29.0% and 33.0%, resp.). Blackcurrant oil was the richest source of gamma C18: 3 (18.5%) and C18:4 (3.6%). Apple oil had high levels of C18:2 (55.5%) and C18:1 (29.4%). Blackcurrant oil had 229.5 mg/100 g of tocochromanols, predominantly gamma-tocopherol (117.8 mg/100 g) and alpha-tocopherol (84.3mg/100 g). Raspberry oil was rich in gamma-, alpha-, and delta-tocopherol (193.5; 65.6; and 32.2mg/100 g, resp.). Strawberry oil contained gamma-and delta-tocopherol, 49.0 and 6.1mg/100 g, respectively. Apple contained all isomers of alpha-, beta-, gamma-, and delta-tocopherols at 41.7, 62.7, 13.6, and 21.8mg/100 g, respectively. The level of tocotrienols in the analysed oils ranged from 0.85 to 6.73mg/100 g. Ten different phytosterols were found in the tested oils. The richest sources of phytosterols were blackcurrant oil (6824.9.. g/g) followed by raspberry (5384.1 mu g/g), strawberry (4643.1 mu g/g), and apple oil (3460.0 mu g/g). The dominant compound in the analysed oils was sitosterol, from 2630 mu g/g in apple oil to 3630 mu g/g in blackcurrant oil.