Effect of extrusion processing on physicochemical and functional properties of water-soluble dietary fiber and water-insoluble dietary fiber of whole grain highland barley

Abstract

The effect of extrusion processing on water-soluble dietary fiber (SDF) and water-insoluble dietary fiber (IDF) of whole grain highland barley (HB) in terms of morphology, physicochemical and functional properties, and antioxidant activities was studied. Extrusion processing resulted in the more porous and loose structure of SDF and IDF, and significantly increased the specific surface area of SDF and IDF. The predominant monosaccharide in IDF and SDF was cellulose. Extrusion processing improved the water holding capacity of SDF and IDF by 23.9% and 40.4%, respectively. The glucose absorption capacity and glucose dialysis retardation index of IDF and SDF were further significantly improved by extrusion processing, indicating the great potential of glucose control <i>in vitro</i> of IDF and