Abstract:Dietary fiber was extracted from buckwheat brans by alkaline hydrolysis method. The optimum extraction condition was found by single-factor and orthogonal experiment, and the properties of dietary fiber were also studied. The results showed that the optimum extraction condition was as follows: the temperature of alkaline hydrolysis 80 ℃, the concentration of NaOH 1.0%, the ratio of material to solution 1:16 (g/mL), and the time of alkaline hydrolysis 80 min. Under these conditions, the yield of dietary fiber was 20.39%. The water holding capacity of insoluble dietary fiber, swelling capacity, and solubility of soluble dietary fiber were 5.97 g/g, 7.4 mL/g and 96%, respectively.
