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Antioxidant Capacity – Definition & Importance

Antioxidant capacity describes the ability of a substance or food to neutralize free radicals and reduce oxidative stress in the body.

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Things worth knowing about "Antioxidant Capacity"

Antioxidant capacity describes the ability of a substance or food to neutralize free radicals and reduce oxidative stress in the body.

What Is Antioxidant Capacity?

Antioxidant capacity is a measure of how effectively a substance, food, or biological system is able to neutralize free radicals. Free radicals are highly reactive molecules that form in the body as a result of normal metabolic processes, as well as through external factors such as UV radiation, smoking, and environmental pollution. These molecules can damage cells, proteins, and DNA – a process known as oxidative stress.

A high antioxidant capacity means that a substance is particularly effective at rendering these harmful molecules harmless, thereby contributing to the protection of the organism.

Biological Importance

The human body relies on multiple antioxidant defense systems working in concert to keep oxidative stress under control. These include endogenous enzymes such as superoxide dismutase, catalase, and glutathione peroxidase, as well as dietary antioxidants obtained from food.

Vitamin C (ascorbic acid): a water-soluble antioxidant that primarily protects aqueous body fluids
Vitamin E (tocopherol): a fat-soluble antioxidant that protects cell membranes
Beta-carotene: a precursor to vitamin A with antioxidant activity in tissues
Polyphenols: plant-based compounds found in fruits, vegetables, tea, and red wine
Selenium and zinc: trace elements that act as cofactors for antioxidant enzymes

Measurement Methods

Antioxidant capacity can be measured in the laboratory using various test methods. The most commonly used include:

DPPH assay: measures the ability to neutralize the stable DPPH radical
FRAP assay (Ferric Reducing Antioxidant Power): determines the reducing power of a sample
ORAC assay (Oxygen Radical Absorbance Capacity): measures protection against oxygen-based radicals
TEAC assay (Trolox Equivalent Antioxidant Capacity): compares activity against the synthetic standard Trolox

These tests provide comparable values, though results may differ depending on the method used. They are widely used in food science to assess the antioxidant quality of foods.

Antioxidant Capacity in Foods

Many natural foods are particularly rich in antioxidant capacity. These include:

Berries (e.g., blueberries, aronia berries, pomegranate)
Green leafy vegetables (e.g., spinach, kale)
Nuts and seeds
Green and black tea
Dark chocolate (high cocoa content)
Spices such as turmeric, cinnamon, and ginger

A balanced, plant-rich diet plays an essential role in supporting the antioxidant capacity of the body.

Health Relevance

Oxidative stress has been linked to the development of numerous chronic diseases, including cardiovascular disease, type 2 diabetes, neurodegenerative conditions (such as Alzheimer disease), and certain cancers. Adequate antioxidant intake through diet is therefore considered an important element of disease prevention.

However, it is important to note that excessive intake of isolated antioxidants in supplement form is not always beneficial. Some studies suggest that high doses of certain antioxidants in supplement form can even be counterproductive. Obtaining antioxidants naturally through food is generally considered safer and more effective.

References

Halliwell, B. & Gutteridge, J. M. C. (2015): Free Radicals in Biology and Medicine. 5th Edition. Oxford University Press.
Prior, R. L., Wu, X. & Schaich, K. (2005): Standardized methods for the determination of antioxidant capacity and phenolics in foods and dietary supplements. Journal of Agricultural and Food Chemistry, 53(10), 4290–4302.
World Health Organization (WHO): Diet, nutrition and the prevention of chronic diseases. WHO Technical Report Series, No. 916 (2003).

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