Abstract: Using lacquer wax as core material, different kinds of wall materials were used to prepare lacquer wax fatty powder by spray drying. The emulsifying ability and entrapping rate were taken as response values. The preparation conditions of lacquer wax fatty powder were optimized by single factor experiment.The results showed that the wall material was the blend of maltodextrin and soybean protein isolate(SPI)(mass ratio 4:1);the emulsifier was sucrose fatty acid ester and glyceryl monostearate(mass ratio 8:2), and the addition amount was 3.5%(based on the total mass of core wall); the amount of arabic gum was 2.5%, the ratio of wall to core was 2:1, the total solid content was 30%. Under these conditions the emulsifying ability of emulsion was 94.2% and the embedding rate was 83.46%. Fourier transform infrared spectroscopy (FT-IR) showed that the entrapped structure of lacquer wax fatty powder was initially formed. The results of GC-MS showed the emulsification and spray drying almost no influence to the composition of main fatty acids in lacquer wax fatty powder. The lacquer wax fatty powder contained 68.329% palmitic acid, 19.245% oleic acid and 8.673% stearic acid. Scanning electron microscopy (SEM) and particle size analyzer showed that the lacquer wax fatty powder was spherical, and its particle size was mainly distributed from 1 to 5 μm. The accelerated oxidation storage test showed that the peroxide value (67.8 mmol/kg) of lacquer wax was significantly higher than that of lacquer wax fatty powder(27.2 mmol/kg) after microencapsulation, indicating that microencapsulation could effectively reduce the oxidative rancidity of lacquer wax.

Key words: lacquer seed, lacquer wax, fatty powder, powder oil, microcapsules