Effects of high-temperature heat treatment of oat kernel on viscosity properties of oat flour

In order to provide experimental data on viscosity properties of oats after high-temperature treatment, the oat (Avena Nuda.) seed was milled into four components such as bran, shorts, break flour and middling flour after air-heating at 140, 155 and 170℃ for 30 min and far-infrared heating at 200, 220 and 240℃ for 15 min respectively. The viscosity properties of break flour, middling flour, and oat flour (mixture of break flour and middling flour with nature milling ratio) were investigated. The results showed that after high-temperature treatment, the average gelatinization temperature of break flour, middling flour and oat flour decreased significantly, which were lower than that of oat without high-temperature treatment. Their peak viscosity, final viscosity and hold viscosity increased both under air-heating (140℃, 155℃) and far-infrared heating (200℃), compared with non-treated samples. With the temperature of high-temperature effects treatment increasing gradually, their viscosity properties decreased. Proper treatment temperature, such as 140～155℃ air heating or 200℃ far-infrared heating can decrease the gelatinization temperature and increase the viscosity of oat flour.