Antioxidant Activity of Phenolic Compounds
Summary
Phenolic compounds, a diverse class of plant secondary metabolites bearing one or more hydroxylated aromatic rings, play a central role in mitigating oxidative damage across food, pharmaceutical and biological systems. Their antioxidant activity arises from the capacity to donate electrons or hydrogen atoms, thereby neutralising reactive oxygen species and terminating radical chain reactions. Research has elucidated how structural features—such as the number and position of hydroxyl groups, conjugated double bonds and glycosylation—govern radical-scavenging efficiency. The interplay between different reaction mechanisms, notably single-electron transfer and hydrogen-atom transfer, underpins assay-dependent variations in measured activity. Beyond fundamental chemistry, phenolic antioxidants contribute to food preservation, nutraceutical development and potential therapeutic applications in managing oxidative-stress-related disorders. Advances in analytical methods, computational modelling and mechanistic studies continue to refine our understanding of structure–activity relationships, standardise capacity measurements and inform dietary guidelines that leverage the health benefits of phenolic-rich foods.
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Antioxidant Activity of Phenolic Compounds publication trend
The graph below shows the total number of articles in antioxidant activity of phenolic compounds across all publications each year (not limited to Nature Index journals).
Technical terms
Phenolic compound: A plant-derived molecule featuring one or more hydroxyl groups directly attached to an aromatic ring, capable of undergoing redox reactions.
Free radical: An unstable atom or molecule bearing an unpaired electron, which can initiate chain reactions leading to oxidative damage.
Oxidative stress: A disturbance in the balance between pro-oxidant species and antioxidant defences, resulting in potential cellular damage.
Radical scavenging: The process by which an antioxidant donates an electron or hydrogen atom to neutralise reactive radicals and inhibit propagation of oxidative chain reactions.
Coulometry: An electroanalytical technique that quantifies the total charge passed during a redox reaction to determine analyte concentration or capacity.
Folin–Ciocalteu method: A colourimetric assay based on reduction of a phosphomolybdate-phosphotungstate reagent, commonly used to estimate the reducing capacity of phenolic samples.
References
- Insights into the Structure–Capacity of Food Antioxidant Compounds Assessed Using Coulometry. Antioxidants (2023).
- The Chemistry Behind the Folin–Ciocalteu Method for the Estimation of (Poly)phenol Content in Food: Total Phenolic Intake in a Mediterranean Dietary Pattern. Journal of Agricultural and Food Chemistry (2023).
- Radical Scavenging Mechanisms of Phenolic Compounds: A Quantitative Structure-Property Relationship (QSPR) Study. Frontiers in Nutrition (2022).
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