[논문]Megasonic-assisted aqueous extraction of canola oil from canola cake

Gaber, Mohamed.A.Fouad.M.; Trujillo, Francisco J.; Mansour, Maged Peter; Taylor, Cheryl; Juliano, Pablo

doi:10.1016/j.jfoodeng.2019.02.017

Megasonic-assisted aqueous extraction of canola oil from canola cake

Journal of food engineering, v.252, 2019년, pp.60 - 68

Gaber, Mohamed.A.Fouad.M. (School of Chemical Engineering, The University of New South Wales) , Trujillo, Francisco J. (School of Chemical Engineering, The University of New South Wales) , Mansour, Maged Peter (CSIRO Agriculture and Food) , Taylor, Cheryl (CSIRO Agriculture and Food) , Juliano, Pablo (CSIRO Agriculture and Food)

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Abstract: Residual oil in post-expeller canola cake, is industrially recovered by solvent extraction using hexane with greater than 90% recovery. However, due to health and environmental risks, industry is seeking safer and air polluting alternatives to hexane. The present work explores the application of ultrasound in the megasonic range for aqueous-based extraction of oil from canola cake. A factorial experiment was designed to examine various ultrasound and canola cake extraction parameters including frequency (0.4, 1, and 2 MHz; 33.6–122.4 kJ/kg), sonication time (10, 20, and 30 min), cake: water ratio (1:9, 2:8 and 3:7 w/w), and temperature (60, 70, and 80 °C). A rapid and simple aqueous-based megasonic extraction method was established for preliminary screening of studying the effect of processing parameters for maximising oil extractability. We also assessed the oil quality tests for each condition by analysis of free fatty acids (FFA), peroxide value (PV), and chlorophyll for the best conditions. Control (non-megasonic) trials were also carried out in parallel to determine the net ultrasound extractability (NUE). The highest NUE obtained was 49.5% (g oil/100 g hexane extractable oil in meal) at treatment conditions of 2 MHz, 30 min, meal: water 1:9 (w/w), and 80 °C. An aqueous-based centrifugation method was then established and tested under the same conditions without and with ultrasound, giving a net ultrasound yield improvement (NUY) of 31.8% (g oil/100 g meal) and a NUE of 30.6%. The canola oil quality after ultrasound aqueous-based extraction met the industry standard specifications for free fatty acids, chlorophyll, peroxide, and phosphorus content. Highlights In this work, megasonic-assisted aqueous-based extraction of oil from canola cake was investigated as an alternative to conventional hexane extraction. Using a megasonic intervention the aqueous based recovery of canola oil from canola cake approached 50 % oil extractability. Major factors affecting ultrasound aqueous based extraction were identified and indicate that a frequency of 2 MHz, a sonication time of 30 min, a temperature of 80 °C, and 10% solids were the most adequate conditions to yield 47.2% net ultrasound extractability.

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Megasonic-assisted aqueous extraction of canola oil from canola cake

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