Epidemiological studies suggest that consumption of whole grain cereals and whole grain cereal products have many benefical health effects, including reducing risk of diabetes, obesity, coronary heart diseases, stroke and even some cancers. Precise knowledge protective compounds present in cereal grains can be achieved only when specific biomarkers (biological marker, indicator), that could provide estimation of grain cereals absorption and intake, are established and determined. 5-n-alkylresorcinols (main fraction of phenolic compounds in cereals), because of their specific occurrence only in bran fraction, obtained in refining of milling fractions process, could be a very good candidate to play the role of biomarker of whole grain intake. They are absorbed by animals and humans, present in human plasma and as metabolites in urine. Because composition of saturated homologues of 5-n-alkylresorcinols is different in rye and wheat grains, they could be used as an indicator of the intake of the specific type of cereals and whole grain cereal products.
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