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Hot water and cellulase hydrolysis extraction methods were used to obtain soluble and insoluble fractions of dietary fiber (DF). Concentrates of the DF fractions were used to study their structure, physical properties (particle size, density, porosity, and oil adsorption capacity), hydration properties (swelling, water binding capacity, and viscosity), and glucose dialysis retardation index. Hydrolysis with cellulase modified the physical and hydration properties of the different samples analyzed, since this enzyme reduced the particle size in soluble and insoluble dietary fiber (SDF and IDF, respectively), while increasing the water binding capacity of IDF and decreasing that of SDF. Correlation studies carried out between the different properties analysed, showed that the behavior of hydrated fiber and the delay in glucose diffusion are determined by the physical properties of fiber.

Keywords: Dietary fiber; functional …