Optimization of Novel Oil Extraction Technique From Canola Seeds: Lecithin-Based Microemulsion

Nowadays, solvent (hexane) based oil extraction is a widely used commercial technique and there are a number of environmental, economic, and health related concerns. Overcoming such serious issues is driving research to develop alternative safe methods. In the present study, a novel technique, using lecithin-based microemulsion system, is developed for canola oil extraction. At first, pseudoternary phase diagrams of canola oil/lecithin/propanol/water microemulsions are constructed and the effect of temperature on microemulsion formation was evaluated. So that, (lecithin/propanol)/water microemulsion premixes ([2:1]50:50 and [2:3]80:20) are selected for optimization (temperature, exposure time, premix:canola seeds ratio, and agitation rate) of oil extraction from canola seeds using one factor at a time design. Based on "one factor at a time" design, the highest extraction yield (82.6% wt) achieved at 60 degrees C, 60 min, 6: 1 premix: canola seeds ratio without agitation; the premix composition was (lecithin/propanol)/water (2:1)50:50. From quality point of views, the microemulsion-based extracted oils has lower peroxide value, higher acidity, as well as low phosphorous and lecithin contents in comparison with hexane extracted one. This technique confirms its simultaneous extraction, recovery, and solubilization capabilities which can be used for oil extraction and food formulation.