Preparation of Cynomorium songaricum Dietary Fibers and Investigation of Their Physical Properties

Abstract:

Two kinds of dietary fibers were prepared from Cynomorium songaricum. Crushed stems of C. songaricum particles with diameters around 3 mm were defatted with ethanol. The defatted C. songaricum were divided into two portions. One portion was treated with cysteine and vitamin C solution and the other portion was treated with distilled water for 48 h at 60 ℃. Then the residues were collected by filtration and washed with distilled water. After being dried, physical properties of the dietary fibers were measured. The water retention capability and hydration capability of the dietary fibers pretreated with cysteine or without cysteine were 9.20, 5.83 gram and 7.5, 4.4 mL water per gram product, respectively. These data indicated that the dietary fiber pretreated with cysteine is better in quality than that pretreated without cysteine. High molecular weight condensed tannins could be degraded to small molecular derivatives by cysteine in acid solution. The small molecular derivatives could be washed out with water to obtain dietary fiber purer than the one prepared without cysteine.