Optimum Conditions of Instant High-Temperature Fluidization to Improve the Antioxidant Activity of Corn

Abstract:

This research studies the effect of instant high-temperature fluidization on the content of free phenolic and antioxidant activity of corn，and optimizes the conditions of that process. The results show that the fluidizing temperature has the most important effect on antioxidant activity of corn，followed by the fluidizing time and feeding rate，correspondingly，their optimum conditions are 160 ℃，60 s and 21 kg/h，respectively. The content of free phenolic in corn produced as the optimum conditions is 345.88 mg GAE/hg which increases by 27% compared with that of raw corn（P<0.05），and the antioxidant activity of such corn is 8 104.09 μmol TE/hg，which is 1.5 times of that of raw corn（P<0.05）. After corn experiences the instant high-temperature fluidization process，the content of free ferulic acid and free p-coumaric acid of it significantly increases（P<0.05），while the content of bound ferulic acid and bound p-coumaric acid decreases significantly（P<0.05）. This instant high-temperature fluidization can significantly improve the content of free phenolic and antioxidant activity of corn，which is beneficial to strengthen the bioactivity and quality of corn.