Antioxidant Properties of Dietary Phenolic Compounds

Dietary phenolic compounds are a broad class of plant-derived metabolites characterised by one or more aromatic rings bearing hydroxyl groups. They encompass simple phenolic acids, flavonoids, stilbenes and complex tannins, and are abundant in fruits, vegetables, whole grains, legumes, nuts and certain beverages such as tea and wine. These molecules act as antioxidants by donating hydrogen atoms or electrons to reactive oxygen and nitrogen species, thereby interrupting chain reactions that lead to cellular damage. In vivo, the health effects of phenolic antioxidants depend not only on their intrinsic radical‐scavenging capacity but also on their stability during gastrointestinal digestion, absorption across the intestinal barrier and subsequent metabolism by host enzymes and the gut microbiota. Emerging evidence links regular consumption of phenolic‐rich foods with a lower incidence of chronic disorders including cardiovascular disease, neurodegeneration, diabetes and certain cancers. Beyond direct free‐radical neutralisation, these compounds modulate cell signalling pathways, regulate gene expression related to antioxidant defence and influence inflammatory processes. Practical applications range from optimising agricultural and processing methods to enhance phenolic content in staple crops, to formulating functional foods and nutraceuticals. Advances in extraction technologies and processing strategies seek to maximise both yield and bioaccessibility, thereby increasing the potential for global dietary interventions to mitigate oxidative stress and promote public health.

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Antioxidant Properties of Dietary Phenolic Compounds publication trend

The graph below shows the total number of articles in antioxidant properties of dietary phenolic compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Phenolic compounds: Plant‐derived molecules with one or more hydroxylated aromatic rings that contribute to antioxidant activity.

Free radicals: Unstable atoms or molecules containing unpaired electrons, capable of damaging cellular components.

Antioxidant capacity: The ability of a substance to neutralise free radicals or inhibit oxidative processes.

Bioaccessibility: The fraction of a compound released from the food matrix in the gastrointestinal tract and available for absorption.

Bound phenolics: Phenolic compounds covalently linked to cell‐wall components, released by hydrolytic or microbial processes.

Flavonoids: A major class of polyphenols with a characteristic 15‐carbon framework, implicated in diverse health benefits.

References

1. Cereal-derived polyphenols and their bioactive properties. Current Opinion in Food Science (2024).
2. Importance of Insoluble-Bound Phenolics to the Antioxidant Potential Is Dictated by Source Material. Antioxidants (2023).
3. Functional implications of bound phenolic compounds and phenolics–food interaction: A review. Comprehensive Reviews in Food Science and Food Safety (2022).