Effects of Different Treatments and Modification on the Functional Properties of Rice Bran Dietary Fiber

Abstract:

A series of rice bran dietary fiber，which possess different physicochemical properties，were obtained by treating defatted rice bran with different concentrations of potassium hydroxide （KOH）. The relationship between composition and physicochemical properties were discussed. Moreover，the effects of successive carboxymethylationon the physicochemical properties and subsequent influence on the α-amylase and lipase inhibition capacity of selected rice bran fiber were comparatively investigated.An increase in theoil binding capacitybut the decrease in the water holding capacitywith the incremental KOH concentration was observed，which was mainly due to the reduced hydration groups with the removal of starch，protein and partial hemicelluloses. The hydration capacities and oil binding capacity as well as the inhibiting capacities to lipase of rice bran dietary fiber were significantly enhanced after carboxymethylation.