Alkylresorcinol – Biomarker and Plant Compound
Alkylresorcinols are bioactive plant compounds found mainly in whole grain wheat and rye. They serve as reliable biomarkers of whole grain intake and have potential health-promoting properties.
Things worth knowing about "Alkylresorcinol"
Alkylresorcinols are bioactive plant compounds found mainly in whole grain wheat and rye. They serve as reliable biomarkers of whole grain intake and have potential health-promoting properties.
What Are Alkylresorcinols?
Alkylresorcinols are a group of phenolic lipids – fat-soluble plant compounds with an aromatic ring structure. They are found predominantly in the bran and germ layers of cereal grains such as wheat, rye, and barley. Chemically, they consist of a resorcinol ring (an aromatic diol) and an aliphatic side chain of varying length, typically containing 15 to 25 carbon atoms.
Because of their selective distribution within the grain – they are found almost exclusively in whole grain products – alkylresorcinols are used in nutritional research as biomarkers of whole grain consumption. Higher concentrations in blood plasma are considered a reliable indicator of a whole grain-rich diet.
Food Sources
Alkylresorcinols are found primarily in the following foods:
- Whole grain rye products (e.g., rye bread, crispbread) – particularly high content
- Whole grain wheat products (e.g., whole grain pasta, whole wheat bread)
- Barley and triticale (a wheat-rye hybrid)
- In smaller amounts in millet and other cereals
Refined grain products such as white flour or white rice contain virtually no alkylresorcinols, as they are removed along with the bran during the milling process.
Mechanism of Action and Biological Functions
Alkylresorcinols exert several biological effects in the human body:
- Antioxidant activity: They neutralize free radicals and protect cells from oxidative stress, potentially contributing to the prevention of chronic diseases.
- Antimicrobial properties: Laboratory studies have demonstrated inhibitory effects of alkylresorcinols against certain bacteria and fungi.
- Influence on lipid metabolism: Research suggests that alkylresorcinols may affect cholesterol metabolism and modulate fat digestion.
- Potential anticancer properties: Preclinical studies have shown that alkylresorcinols can inhibit the growth of certain tumor cells, though further clinical research is needed.
- Blood sugar regulation: Some evidence points to a blood glucose-modulating effect that may help in the prevention of type 2 diabetes.
Alkylresorcinols as Biomarkers
A particularly important role of alkylresorcinols in nutritional science is their function as an objective biomarker of whole grain intake. Since they are not produced by the human body and originate almost exclusively from whole grain cereals, their plasma levels reliably reflect actual whole grain consumption. This is especially valuable in epidemiological studies, where the accuracy of dietary questionnaires is limited.
Alkylresorcinols are typically measured in blood plasma or red blood cells. Elevated levels are associated with higher whole grain intake, which in turn has been linked to a reduced risk of cardiovascular disease, type 2 diabetes, and certain cancers.
Recommended Intake and Safety
Currently, there are no official intake recommendations for alkylresorcinols from organizations such as the WHO or the European Food Safety Authority (EFSA). Typical daily intake through diet in individuals following a whole grain-rich diet ranges from approximately 50 to 200 mg per day. At normal dietary intake levels, alkylresorcinols are considered safe and well tolerated. No evidence of toxicity at usual dietary intake levels has been reported.
Interactions
No clinically relevant interactions between alkylresorcinols and medications are currently known. However, since they may influence fat digestion and lipid metabolism, individuals taking lipid-lowering medications who follow a very whole grain-rich diet should seek medical advice.
References
- Landberg R. et al. (2008): Alkylresorcinols as biomarkers of whole-grain wheat and rye intake: systematic review and meta-analysis of observational studies. American Journal of Clinical Nutrition, 87(4):832-838.
- Ross A. B. et al. (2004): Alkylresorcinols in cereals and cereal products. Journal of Agricultural and Food Chemistry, 52(16):5020-5026.
- Prabhasankar P. et al. (2011): Biological functions and application of alkylresorcinols from wheat and rye bran. Food Chemistry, 124(2):462-469.
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