超声辅助提取打瓜籽油工艺及其脂肪酸成分研究_宋颖凡 . Study on ultrasonic-assisted extraction of seeding-watermelon seeds oil and analysis of fatty acid compositions

Abstract

With the seeding-watermelon seeds as raw material,petroleum ether as extraction agent,the ultrasonicassisted extraction technology was used to extract seeding-watermelon seed oil.The influences of particle size,solid-liquid ratio,ultrasonic frequency,ultrasonic temperature and time on the extraction rate and linoleic acid content of seeding-watermelon seeds oil were studied.Through the orthogonal test,the optimal extraction conditions were as follows:particle size 60 mesh,solid liquid ratio 1:8g/mL,ultrasonic frequency 36kHz,ultrasonic temperature 50℃,ultrasonic time 40min.Under these conditions the seeding-watermelon seeds oil extraction rate reached 23.89%.Gas chromatographic(GC)analysis was employed to analyze the components of fatty acid of seeding-watermelon seeds oil which contained:palmitic acid,elaidic acid,oleic acid,linoleic acid.Among them the linoleic acid content is up to 184.37mg/g the highest of all.