Abstract: The extraction process conditions of dietary fiber from buckwheat grain were optimized with enzymatic method,as well as the decolorozation process conditions of the extracted dietary fiber. The optimal extraction conditions are:temperature 60 ℃,pH 6.0,amylase hydrolysis time 60 min,amylase concentration 0.3%,adjusting pH to 7.0 and temperature to 40 ℃,proteinase hydrolysis time 30 min,and proteinase concentration 0.3%. The optimal decolorization conditions are:pH 11.0,concentration of hydrogen peroxide 4%,temperature 90℃ and reaction time 90 min.

Key words: buckwheat grain, dietary fiber, enzymatic hydrolysis, decolorization