What are antioxidants

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Understanding Antioxidants: Mechanisms, Sources, and Health Benefits

What Are Antioxidants?

Antioxidants are substances that can delay or prevent the oxidation of other molecules, thereby protecting cells from damage caused by free radicals and reactive oxygen species (ROS) Santos-Sánchez2019Yang2018. These compounds act through various mechanisms, including hydrogen atom transfer (HAT), single electron transfer (SET), and metal chelation . The primary role of antioxidants is to neutralize free radicals, which are unstable molecules that can cause cellular damage, leading to various diseases and aging Rahaman2023Halliwell1996.

Mechanisms of Action

Hydrogen Atom Transfer (HAT) and Single Electron Transfer (SET)

Antioxidants can neutralize free radicals through HAT and SET mechanisms. In the HAT mechanism, antioxidants donate a hydrogen atom to free radicals, stabilizing them. In the SET mechanism, antioxidants donate an electron to free radicals, converting them into less reactive species Santos-Sánchez2019Chaudière1999. These mechanisms are crucial for understanding how antioxidants function at a molecular level and their potential applications in health and disease prevention .

Metal Chelation

Some antioxidants can chelate transition metals, preventing these metals from catalyzing the formation of free radicals. This is particularly important in biological systems where metal-catalyzed oxidation can lead to significant cellular damage Santos-Sánchez2019Brewer2011.

Sources of Antioxidants

Natural Sources

Antioxidants are abundant in various natural sources, including fruits, seeds, and other plant-based foods. Common natural antioxidants include vitamins C and E, carotenoids, flavonoids, and phenolic acids Rahaman2023Brewer2011. These compounds are known for their ability to scavenge free radicals and protect the body from oxidative stress Rahaman2023Halliwell1996.

Synthetic Antioxidants

In addition to natural sources, antioxidants can also be synthesized. Synthetic antioxidants like butylated hydroxytoluene (BHT) and butylated hydroxyanisole (BHA) are commonly used in the food industry to prolong shelf life and maintain nutritional quality . However, there is growing consumer concern regarding the safety of synthetic antioxidants, leading to increased interest in natural alternatives .

Health Benefits

Prevention of Chronic Diseases

Antioxidants play a significant role in preventing chronic diseases such as cardiovascular diseases, cancer, and neurodegenerative disorders. They achieve this by neutralizing free radicals, thereby reducing oxidative stress and preventing cellular damage Rahaman2023Halliwell1996Salehi2018. For instance, vitamins C and E have been shown to be effective in reducing oxidative damage and improving overall health Halliwell1996Salehi2018.

Anti-Aging Properties

Oxidative stress is a major contributor to the aging process. By neutralizing free radicals, antioxidants can slow down the aging process and reduce the risk of age-related diseases such as Alzheimer's and cataracts Rahaman2023Halliwell1996.

Enhancing Immune Function

Antioxidants also play a crucial role in enhancing immune function. They protect immune cells from oxidative damage, thereby improving the body's ability to fight infections and diseases Halliwell1996Brewer2011.

Conclusion

Antioxidants are vital compounds that protect the body from oxidative stress and free radical damage. They act through various mechanisms, including hydrogen atom transfer, single electron transfer, and metal chelation. Found in both natural and synthetic forms, antioxidants offer numerous health benefits, including the prevention of chronic diseases, anti-aging properties, and enhanced immune function. Understanding the mechanisms and sources of antioxidants can help in making informed choices about diet and health supplements to improve overall well-being.

Sources and full results

Most relevant research papers on this topic

Antioxidant Compounds and Their Antioxidant Mechanism

Antioxidant compounds, such as polyphenols, carotenoids, and vitamins C, act through various chemical mechanisms to delay or prevent oxidation of substrates, aiding in understanding their biological meaning and potential uses.

Literature Review

2019·

526citations

·N. Santos-Sánchez et al.

Antioxidants·

DOI

Antioxidants: Differing Meanings in Food Science and Health Science.

Antioxidants in food science help maintain freshness and prolong shelf lives, while in health science they may quench reactive oxygen species and prevent chronic diseases, but strong evidence for their beneficial effects is lacking.

Literature Review

2018·

99citations

·Chung S. Yang et al.

Journal of agricultural and food chemistry·

DOI

Natural antioxidants from some fruits, seeds, foods, natural products, and associated health benefits: An update

Natural antioxidants found in fruits, seeds, foods, and natural products have various health-promoting effects, improving free radical disease management without the toxicities and side effects of conventional medications.

Systematic Review

2023·

299citations

·M. Rahaman et al.

Food Science & Nutrition·

DOI

Antioxidants in human health and disease.

Antioxidants, particularly vitamins E and C, are crucial for maintaining human health and preventing damage from reactive oxygen and nitrogen species.

Literature Review

1996·

1980citations

·B. Halliwell

Annual review of nutrition·

DOI

The characterization of antioxidants.

Antioxidants are used in nutrition to prolong shelf life and maintain nutritional quality of lipid-containing foods, and to modulate oxidative damage in the human body.

Literature Review

1995·

962citations

·B. Halliwell et al.

Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association·

DOI

Intracellular antioxidants: from chemical to biochemical mechanisms.

Intracellular antioxidants prevent free radical formation and play a crucial role in regulating protein expression and activity in aerobic cells.

Literature Review

1999·

683citations

·J. Chaudière et al.

Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association·

DOI

NATURAL ANTIOXIDANTS: SOURCES, COMPOUNDS, MECHANISMS OF ACTION, AND POTENTIAL APPLICATIONS

Natural antioxidants, such as phenolic acids, flavonoids, and volatile oils, can effectively maintain the quality of ready-to-eat food products, offering a safer alternative to synthetic antioxidants.

Literature Review

2011·

1633citations

·M. S. Brewer

Comprehensive Reviews in Food Science and Food Safety·

DOI

Understanding oxidants and antioxidants: Classical team with new players.

Antioxidants and probiotics in fortified foods and supplements help protect cells from oxidative stress and damage, which can contribute to various diseases.

2020·

426citations

·S. S. Ali et al.

Journal of food biochemistry·

DOI

Antioxidants: Positive or Negative Actors?

Antioxidants may play a dual role in disease prevention and disease onset, but their ability to decrease pathologic reactive oxygen species is not clearly established.

Literature Review

2018·

187citations

·B. Salehi et al.

Biomolecules·

DOI

Role of antioxidants in prophylaxis and therapy: A pharmaceutical perspective.

Novel drug delivery systems (NDDS) can improve the bioavailability and effectiveness of antioxidants for prophylaxis and therapy in various diseases.

Literature Review

2006·

870citations

·D. Ratnam et al.

Journal of controlled release : official journal of the Controlled Release Society·

DOI

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