In this study, the subcritical water extraction is proposed as an alternative and greener processing
method for simultaneous removal of oil- and water-soluble phase from sunflower seeds. Extraction kinetics
were studied at different temperatures and material/solvent ratios in a batch extractor. Degree of
hydrothermal degradation of oils was observed by analysing amount of formed free fatty acids and their
antioxidant capacities. Results were compared to oils obtained by conventional methods. Water soluble
extracts were analysed for total proteins, carbohydrates and phenolics and some single products of
hydrothermal degradation.
Highest amount of oil was obtained at 130 C at a material/solvent ratio of 1/20 g/mL after 30 min of
extraction. For all obtained oils minimal degree of hydrothermal degradation could be identified. High
antioxidant capacities of oil samples could be observed. Water soluble extracts were degraded at temperatures
P100 C, producing various products of hydrothermal degradation.