Abstract: Kiwi fruit seed oil was obtained by the supercritical CO2 extraction, and its microcapsulation was studied. The results indicated that the optimal conditions of the kiwi fruit seed oil extraction with supercritical CO2 are as following: extraction pressure 30 MPa, extraction temperature 45 ℃, extraction time 120～150 min. The order of the effects on the encapsulating efficiency, which was from the elements of the microcapsulation formulation, is ratio of core material to wall material > ratio of wall material (arabic gum: malt dextrin)>concentration of material to solvent. Through the orthogonal test design, the optimal ratio of the microcapsulation was obtained with arabic gum to malt dextrin 2:1, the ratio of core to wall 1:3, the concentration of the material 25%(W/V), and the encapsulation efficiency of the productions reached 70%. The stability to the oxidation was increased greatly. The products of micro-encapsulation of kiwi fruit seed oil are spherical, smooth and symmetrical with the optimal proportions and through the process.

Key words: kiwi fruit seed oil, supercritical CO2 extraction, microcapsulation, spray drying