Abstract
ScopeSeveral dietary fiber properties are suggested to be important for the profiling of the microbiota composition, but those characteristics are rather unclear. Whether different physico‐chemical properties of barley dietary fiber influence the gut microbiota composition is investigated.Methods and resultsSeven diets containing equal amounts of dietary fiber from barley malts, brewer's spent grain (BSG), and barley extracts, resulting in varying amounts of β‐glucan, soluble arabinoxylan, and insoluble arabinoxylan in the diets were given to conventional rats. Malts increased microbiota alpha diversity more than BSG and the extracts. The intake of soluble arabinoxylan was related to Akkermansia and propionic acid formation in the cecum of rats, whereas β‐glucan and/or insoluble arabinoxylan were attributed to some potentially butyrate‐producing bacteria (e.g., Lactobacillus, Blautia, and Allobaculum).ConclusionThis study demonstrates that there is a potential to stimulate butyrate‐ and propionate‐producing bacteria in the cecum of rats with malt products of specific fiber properties. Moreover, BSG, a by product from beer production, added to malt can possibly be used to further modulate the microbiota composition, toward a higher butyric acid formation. A complex mixture of fiber as in the malts is of greater importance for microbiota diversity than purer fiber extracts.
Highlights
Profiling of the microbiota composition, but those characteristics are rather changes and bacterial cross-feeding unclear
To investigate the possibility to modulate microbiota composition and metabolic effects with barley malt products, the diets in the present study were designed to have the same quantity of total fiber (80 g kg−1; Table S1, Supporting Information A), but with different fiber characteristics of β-glucan and arabinoxylan (Table 1)
By using the software tool LEfSe to compare bacterial taxa at species level, we found that cinnamon malt (CM) increased the relative abundance of Lactobacillus reuteri (Figure S1, Supporting information A), a probiotic used for treatment and prevention of rotaviral
Summary
Profiling of the microbiota composition, but those characteristics are rather changes and bacterial cross-feeding unclear. Methods and results: Seven diets containing equal amounts of dietary fiber from barley malts, brewer’s spent grain (BSG), and barley extracts, resulting in mechanisms.[1,2] Upon microbiota fermentation, dietary fibers can yield different amounts and patterns of SCFA, mostly acetic-, propionic-, and butyric acids, which are rapidly absorbed by the varying amounts of β-glucan, soluble arabinoxylan, and insoluble colonocytes into the circulation, serving arabinoxylan in the diets were given to conventional rats. The intake of soluble arabinoxylan was related to Akkermansia and propionic acid formation in the cecum of rats, whereas β-glucan and/or insoluble as energy source and precursors in anti-inflammatory mechanisms.[3]. The characteristics of the dietary fiber components reaching the colon may affect the microbiota composition arabinoxylan were attributed to some potentially butyrate-producing bacteria differently, but this is not yet well un-
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