FOOD SCIENCE ›› 2003, Vol. 24 ›› Issue (10): 113-117.

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Study on Ultrasonically Aided Solvent Extraction of Walnut Oil

 ZHOU  Ru-Jin, GU  Li-Jun, LI  Zhou-Guo, HU  Ai-Jun, NING  Zheng-Xiang   

  1. 2.College of Food and Bioengineering,SCUT,Guangzhou 510640
  • Online:2003-10-15 Published:2011-12-13

Abstract: Walnut oil, abundant in many kinds of unsaturated fatty acids, has been widely used in food industry and medicineindustry, etc. In this paper, better solvent for ultrasonic extraction (UE) of walnut oil, was chosen first. Then the effects oftemperature, ratio of the weight of walnut to the volume of solvent and UE time were investigated in detail. The results by anorthogonal experiment indicated that the effectiveness of factors on oil yield was in this order: extraction temperature> ratio ofthe weight of raw material to the volume of solvent>power and frequency of ultrasound>extraction time. The technologicalparameters optimized by orthogonal test were as follows: extraction temperature was 60℃,ratio of the weight of raw materialto the volume of solvent was 1:4.5, power and frequency of ultrasound were 300W 25kHz,respectively and extractin time was60min.Compared to the solvent extraction, the ultrasonic wave extraction could reduce the solvent consumption, decrease theextracting temperature and save the extracting time.

Key words: walnut oil, extraction, ultrasonic wave intensification