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Knud Erik Bach Knudsen

Dietary fibers and associated phytochemicals in cereal

Publikation: Bidrag til bog/antologi/rapport/proceedingKonferenceabstrakt i proceedingsForskning

Epidemiological studies have linked whole-grain cereal consumption to a reduced risk of developing several chronic diseases – coronary heart disease, arteriosclerosis, type-2 diabetes and colonic and breast cancer. The underlying physiological mechanisms behind the protective effects of whole-grains, however, are unclear but is most likely assigned to a concerted action of dietary fiber (DF) and a wide variety of phytochemicals. The DF fraction of cereals consists of non-starch polysaccharides (NSP), resistant starch, oligosaccharides (mostly fructans) and the non-carbohydrate polyphenolic ether lignin. The main NSP in cereals are arabinoxylan (AX), mixed linkages β(1-3; 1-4)-glucan (β-glucan) and cellulose, which vary significantly according to the cereal species but also between different tissues of the grains. Rye, triticale, wheat and corn are rich in AX, whereas barley and oats contain a high level of β-glucan. Physiologically, it is of importance that some of the cell wall polysaccharides, i.e. AX and β-glucan (soluble NSP) contribute to higher viscosity as this may influence rate and extent of digestion and absorption in the small intestine. Associated to the DF matrix of cereals, however, is also an array of non-nutritive non-carbohydrate constituents predominantly concentrated in the bran fraction. Of importance in a nutritional-health context is the phenolic components - benzoic acid and cinnamic derivatives and lignans. Of the phenolics only a small fraction is absorbed in the small intestine whereas the major part is passed to the large intestine. The colonic microbiota, along with the degradation and metabolism of DF to short-chain fatty acids and gases, also convert the phenolic compounds into a range of other metabolites that are absorbed to the body and with the capability of influencing the metabolism at the cellular level.
TitelBook of abstracts from the 252nd American Chemical Society National Meeting, American Chemical Society.
Antal sider1
ForlagACS (American Chemical Society)
Udgivelsesåraug. 2016
SiderAGFD 124
StatusUdgivet - aug. 2016
Begivenhed252nd American Chemical Society National Meeting - Philidelphia, USA
Varighed: 21 aug. 201625 aug. 2016
Konferencens nummer: 252


Konference252nd American Chemical Society National Meeting

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