Antioxidant Interactions in Food Systems

Antioxidants are molecular protectors that inhibit oxidative processes in food matrices by neutralising free radicals and chelating metal ions. Within complex food systems, interactions among antioxidants—whether natural phytochemicals or additives—can lead to additive, synergistic or antagonistic effects on overall antioxidant capacity. These interactions are influenced by the chemical structure of individual compounds, reaction mechanisms (such as hydrogen atom transfer, single‐electron transfer and sequential proton‐loss electron transfer), and environmental factors including pH, temperature and medium polarity. Understanding these interactions is essential for optimising food formulation, enhancing shelf life and maximising health benefits. Recent advances employ a combination of spectrophotometric and electrochemical assays to elucidate the molecular basis of interaction effects, while computational models are increasingly used to predict outcomes in multi‐component systems. The global significance of this field spans from the development of functional foods and nutraceuticals to the design of natural preservative strategies that reduce reliance on synthetic additives.

Research from Nature Portfolio

Recent mechanistic studies have elucidated the structure–activity relationships of phenolic acids, revealing how substituent groups modulate antioxidant efficiency via hydrogen atom transfer and electron‐transfer pathways. One work demonstrated that methoxy and phenolic hydroxyl groups lower O–H bond dissociation enthalpy and enhance single‐electron transfer capacity, with computational analyses confirming that sequential proton‐loss electron transfer predominates under aqueous conditions. Another foundational study characterised the synergistic antioxidant interaction between floral and tea polyphenols, showing that phenylethanoid glycosides and catechins form complexes with enhanced radical‐scavenging capacity, although simulated digestion diminishes this effect by altering compound stability and bioaccessibility. These investigations underscore the intricate balance between compound structure, intermolecular interactions and matrix effects in determining antioxidant performance.

Antioxidant Interactions in Food Systems publication trend

The graph below shows the total number of articles in antioxidant interactions in food systems across all publications each year (not limited to Nature Index journals).

Technical terms

Synergistic effect: Interaction in which the combined antioxidant activity exceeds the sum of individual activities.

Antagonistic effect: Interaction in which the combined antioxidant activity is lower than the sum of individual activities.

Additive effect: Interaction in which the combined antioxidant activity equals the sum of individual activities.

Ferric-reducing antioxidant power (FRAP): A spectrophotometric assay measuring the ability of antioxidants to reduce Fe³⁺ to Fe²⁺.

Oxygen radical absorbance capacity (ORAC): A fluorescence-based assay quantifying antioxidant scavenging of peroxyl radicals.

References

1. Individual and Combined Antioxidant Activity of Spices and Spice Phenolics. Antioxidants (2023).
2. Structure-antioxidant activity relationship of methoxy, phenolic hydroxyl, and carboxylic acid groups of phenolic acids. Scientific Reports (2020).
3. Investigation of Antioxidant Synergisms and Antagonisms among Phenolic Acids in the Model Matrices Using FRAP and ORAC Methods. Antioxidants (2022).
4. Antioxidant synergistic effects of Osmanthus fragrans flowers with green tea and their major contributed antioxidant compounds. Scientific Reports (2017).