Disclosed is a method of producing artificial oil bodies, the method comprising i) obtaining an extract of a plant comprising oleosin, wherein the extract is plant meal, ii) at least partially purifying protein from the extract, wherein the protein comprises oleosin, and iii) mixing the protein comprising oleosin with surfactant and oil comprising polyunsaturated fatty acids with four or more double bonds to produce the artificial oil bodies. Also disclosed is a method of partially purifying oleosin from a plant extract, the method comprising 1) adjusting the pH of the extract to a pH of at least about 11.5, 2) separating 1) to produce a solid and liquid phase and selecting the liquid phase, 3) reducing the pH of the liquid phase to precipitate the proteins, 4) separating 3) to produce a solid and liquid phase and selecting the solid phase, and 5) dispersing the solid phase in a carrier, wherein the extract is plant meal.
