Abstract: Effect of microwave treatment on the inactivation of lipase and the retention rate of vitamin C in pine pollen was explored by one-factor-at-a-time and orthogonal array design methods. The results showed that lipase was effectively inactivated by microwave radiation. The optimal conditions for inactivating lipase in pine pollen were initial water content of 14%, microwave power of 324.3 W, and microwave treatment time of 2 min. Under these conditions, the inactivation rate of lipase in pine pollen was 92.4%, and the retention rate of vitamin C was 97.7%.

Key words: pine pollen, microwave, lipase, vitamin C