Digestion characteristics of sweet potato (Ipomoea batatas) polysaccharide in vitro and its relieving effect on ability to relieve exercise fatigue in mice

Abstract The characteristics of Ipomoea batatas polysaccharide (IBP) in vitro and its anti-fatigue effects on exercise fatigue in mice were investigated. The dynamic division of IBP was simulated in vitro, and the structural changes in IBP were analyzed by Fourier Transform Infra-Red (FTIR) and High Performance Liquid Chromatography (HPLC). The results revealed that no free monosaccharides were produced after simulated division in vitro. The CH 2 signal gradually disappeared in the gastric juices after digestion, and the peak attributed to COO asymmetric vibration shifted to the longwave strength in the gastrointestinal juices after digestion. The mean exhaustive swimming time of each IBP dose group was significantly different from that of the blank control group ( P < 0.05); in particular, the exhaustive swimming time of the high-dose group increased by 81%, the contents of muscle glycogen and liver glycogen were significantly greater than those of the blank control group ( P < 0.05), the MDA equivalents for Thiobarbituric Acid Reactive Substances (TBARS) of exhaustive swimming mice in each IBP dose group decreased significantly ( P < 0.05), and the activities of SOD, CAT, and GPx in the high-dose group increased by 61%, 89%, and 72%, respectively, compared with those in the blank control group. IBP could effectively relieve exercise fatigue and provide new raw materials for use as dietary supplements. Graphical Abstract Note: Gastrodigestive products were from Ipomoea batatas polysaccharide after dynamic simulated gastric digestion in vitro ; gastrointestinal digestive products were from Ipomoea batatas polysaccharide after dynamic simulated gastrointestinal digestion in vitro . Blank Control group (BC), Taurine Control group (TC), Low dose Ipomoea Batatas Polysaccharide (IBPL), middle dose Ipomoea Batatas Polysaccharide (IBPM) and high dose Ipomoea Batatas Polysaccharide (IBPH). Analysis of the digestive infraredspectra of gastric juice (A), gastrointestinal juice (B) and effects of Ipomoea batatas polysaccharide on the levels of serum ammonia, inorganic phosphate, and lactic acid in exhaustive swimming mice