Structural, antioxidant and adsorption properties of dietary fiber from foxtail millet (Setaria italica) bran

Abstract

BACKGROUND Foxtail millet (Setaria italica) bran is a by‐product of millet processing, rich in dietary fiber (DF) and has great application value. A comparative study was conducted to explore the differences in structural and functional properties among millet bran DF, soluble dietary fiber (SDF) and insoluble dietary fiber (IDF). RESULTS There was a significant difference in the content of monosaccharides between SDF and IDF, in which xylose, arabinose and glucose were the main compositions. The results of scanning electron microscopy showed that DF and IDF had different forms of network structure, and SDF presented a sign of mutual adhesion. The total phenolic and flavonoid contents were 0.54 and 0.08 g kg−1 in SDF. Antioxidant activity of SDF was higher than that of IDF based on the evaluation of free radical scavenging and iron reducing capacity in vitro. Meanwhile, the glucose dialysis retardation index of IDF and SDF was 12.59% and 9.26% at 30 min, respectively. And, there was no significant difference in the adsorption capacity of glucose among different samples (P > 0.05). Furthermore, SDF had strong α‐amylase inhibition (17.92% inhibition rate) and sodium cholate adsorption capacities; the adsorption amount was 16.76 g kg−1 in 2.00 g L−1 sodium cholate solution. CONCLUSION Foxtail millet bran DF, especially SDF, has good functional properties and would be a suitable ingredient for health‐beneficial food production. However, the relevant verification trials in vivo need to be carried out in the next steps. © 2019 Society of Chemical Industry

Recovery of total, soluble, and insoluble dietary fiber from potato ( Solanum tuberosum ) residues and comparative evaluation of their structural, physicochemical, and functional properties

“…Nevertheless, different surface characteristics were demonstrated in the SDF (Figure 1c), with small irregular blocking structures. These results were similar to previously reported foxtail millet bran DF (Dong et al, 2019;Zhu et al, 2018).…”

“…All dietary fiber samples from potato residues showed α-AAIR, SDF (17.89%) and TDF (11.40%) gave the higher α-AAIR followed by IDF (3.86%) (Table 2). Similar observation found in TDF (14.02%), TA B L E 2 Functional properties of total, insoluble, and soluble dietary fiber obtained from potato residues IDF (2.89%), and SDF (17.92%) from foxtail millet (Dong et al, 2019).…”

Characterization and Antioxidant Activity Determination of Neutral and Acidic Polysaccharides from Panax Ginseng C. A. Meyer

“…In addition, ascorbic acid and tocopherol are also important non-enzymatic antioxidants that can regulate the levels of ROS [22]. Recent studies have found that many compounds derived from the dietary fibers can scavenge ROS [23,24]. Moreover, the antioxidant effect is a key biological effect derived from many plant-based materials.…”

Fermented and Germinated Processing Improved the Protective Effects of Foxtail Millet Whole Grain Against Dextran Sulfate Sodium-Induced Acute Ulcerative Colitis and Gut Microbiota Dysbiosis in C57BL/6 Mice

“…In addition to being a daily nutritional source, small millets, including foxtail millet, have anti-inflammatory properties and can therefore be used for the prevention of related chronic diseases, such as atherosclerosis and diabetes ( 20 , 21 ). Along with its superior nutritional properties and documented anti-inflammatory function, foxtail millet is also rich in non-nutrient prebiotics, such as polyphenols and dietary fibers ( 22 ), suggesting its possible positive effects on the gut microbiota and IBD. Bond polyphenols and peroxidase of foxtail millet bran have also been reported to inhibit colitis-induced carcinogenesis in a mouse model ( 23 , 24 ).…”