Effect of microwave pretreatment of perilla seeds on minor bioactive components content and oxidative stability of oil

Abstract

This study investigated the effects of different microwave power (380 W, 540 W, 700 W) and time (0-10 min) on the minor bioactive components content and oxidative stability of perilla oil. The results indicated that fatty acids in perilla oil were slightly affected by microwave treatment. The oxidative stability of perilla oil increased with increasing microwave treatment intensity and the oil from perilla seeds treated at 700 W for 10 min had the highest oxidative stability. Compared with other microwave treatments, treatment with 700 W for 10 min resulted in significant increases in the total phytosterols content, Maillard reaction products and DPPH radical scavenging activity of perilla oil, while showed dramatic reductions in the total tocopherol content, phenolic compounds content and lipase activity. These results proved that microwave treatment of perilla seeds was an effective way to improve the quality of perilla oil.

Keywords: Lipase activity; Maillard reaction products; Microwave pretreatmnet; Minor bioactive components; Oxidative stability; Perilla seed oil.