Synergistic effects of ultrasound and extraction solvent on the bioactive compound in kenaf seed oil

Kenaf seed oil was extracted with 3 different solvents, i.e. hexane, ethanol and aqueous enzymatic medium with or without ultrasonic assistance. The synergistic effects of ultrasound and extraction solvent on the content of bioactive compound in kenaf seed oil was investigated. Results show that ultrasound-assisted extraction with hexane obtained the highest yield (84.71%), while yield with aqueous enzymatic medium was the lowest (51.12%). Two endothermic peaks exhibited on the melting curve of kenaf seed oil at the temperature range − 37 to − 25 °C and − 12 to − 2 °C, respectively. Linoleic, oleic and palmitic acid are the major fatty acids, accounting for above 96% of the total fatty acids. The content of vitamin E, phosphatide, total phenols and sterol are 92.38–105.01 mg/100 g oil, 0.38–22.28 g/kg, 0.51–71.02 mg GAE/100 g and 161.79–533.12 mg/100 g, respectively. The solvent employed has significant effect ( p