Abstract
Different methods of isolating arabinoxylans (AXs) from triticale were performed to investigate the extraction methods’ effects on the physiological functions of the AXs. Structural, antioxidant, and hypoglycemic activities were determined. The molecular weights (MWs) of enzyme- or water-extracted AXs were lower than those of alkali-extracted AXs. Opposite trends were shown by the arabinose–xylose ratio. Enzyme-extracted AXs exhibited higher glucose adsorption capacity and hydroxyl radical-scavenging efficiency than alkali-extracted AXs. The α-amylase inhibition ability, DPPH radical-scavenging capacity, and metal-chelating activity of alkali-extracted AXs were higher than those of enzyme-extracted AXs. Water-extracted AXs had the highest glucose dialysis retardation index. In conclusion, extraction methods can influence the physiological function of AXs through their structural features. AXs with higher MWs and esterified ferulic acid (FA) levels had higher antioxidant ability, whereas AXs with higher solubility and free FA level exhibited higher hypoglycemic activity.
Highlights
Arabinoxylans (AXs), which are non-starch polysaccharides derived mostly from cereals, demonstrate many physiological functions and health benefits
Our results demonstrated that the arabinose–xylose ratio and molecular weights (MWs) of complex enzyme-extracted AXs (CEAXs)-1 was similar to AEAX, and the amount of total ferulic acid (FA) of CEAX-1 was even higher than of AEAX
The results demonstrated that FA content of AXs plays an important role in their hypoglycemic activity
Summary
Arabinoxylans (AXs), which are non-starch polysaccharides derived mostly from cereals, demonstrate many physiological functions and health benefits. Aside from antioxidant ability, hypoglycemic activity is a physiological function of AXs. One of the mechanisms is to decrease the postprandial hyperglycemia, which is induced by delaying glucose absorption owing to AX viscosity. In the present study, we assumed that the extraction method plays a significant role in the change in AX physiological function via exerting effects on their structural features. Various extraction methods were applied to obtain AXs with different structural features. Structural and physiological functions of all AXs extracted through different methods were determined in this study. Based on these results, we preliminarily obtained the relationship between AXs’ structural features and physiological functions. This study analyzed the influence of extraction methods on AXs’ physiological functions
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