Microstructure, physicochemical and functional properties of Dendrobium officinale pomace and its total dietary fiber.

Dendrobium officinale pomace (DOP) is a high-fiber source derived from an industrial by-product. This study researched and compared the microstructure, physicochemical and functional properties of DOP and the total dietary fiber extracted from DOP (DOPF), with the goal of evaluating the potential applications of DOP or DOPF as a functional component in food products. DOPF exhibited a more porous structure and a less crystalline area compared with DOP. DOPF displayed higher water-holding capacity (20.12 g/g vs. 15.30 g/g in DOP), oil-holding capacity (10.99 g/g vs. 8.93 g/g in DOP) and water swelling ability (5.26 mL/g vs. 3.48 mL/g in DOP), but lower cation exchange capacity (189.87 mmol/kg vs. 334.34 mmol/kg in DOP). Moreover, DOPF exhibited higher cholesterol, nitrite ion, bile acid salt, glucose adsorption capacities and GDRI. Therefore, DOPF is a better choice for ideal supplements for dietary fiber and has the potential to increase the value of DOP in food applications. [ABSTRACT FROM AUTHOR]