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Electron Donor – Definition and Role in Medicine

An electron donor is a chemical substance that transfers one or more electrons to another compound, enabling redox reactions that are essential for many biological processes.

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Things worth knowing about "Electron donor"

An electron donor is a chemical substance that transfers one or more electrons to another compound, enabling redox reactions that are essential for many biological processes.

What is an Electron Donor?

An electron donor is a chemical compound or atom that donates one or more electrons to another reactant – known as the electron acceptor – during a chemical reaction. This process is called oxidation, as the electron donor itself loses electrons. Electron donors play a central role in chemistry and biochemistry, particularly in redox reactions (reduction-oxidation reactions).

Importance in Biochemistry and Medicine

In biological systems, electron donors are indispensable for the energy metabolism of the human body. Mitochondria – the powerhouses of the cell – rely on electron donors such as NADH (nicotinamide adenine dinucleotide) and FADH₂ (flavin adenine dinucleotide) to generate energy in the form of ATP (adenosine triphosphate) through the electron transport chain. Electrons are passed step by step from molecule to molecule until they are ultimately transferred to oxygen.

Examples of Key Biological Electron Donors

NADH: Produced during glucose breakdown (glycolysis) and the citric acid cycle; donates electrons to Complex I of the electron transport chain.
FADH₂: Also generated in the citric acid cycle; donates electrons to Complex II.
Glucose: As the primary energy carrier of the body, glucose serves as a principal electron donor in metabolism.
Hydrogen (H₂): Used as an electron donor by certain bacteria for energy generation.
Antioxidants (e.g. vitamin C, vitamin E, glutathione): Act as electron donors, neutralising harmful free radicals in the body.

Electron Donors and Antioxidants

In medical and nutritional science contexts, the term electron donor is frequently used in relation to antioxidants. Antioxidants are molecules that neutralise free radicals – highly reactive compounds with unpaired electrons – by donating an electron to them. Free radicals can damage cells, proteins, and DNA, and are associated with the development of diseases such as atherosclerosis, cancer, and neurodegenerative disorders.

Well-known dietary electron donors with antioxidant activity include:

Vitamin C (ascorbic acid): water-soluble antioxidant
Vitamin E (tocopherol): fat-soluble antioxidant
Polyphenols (e.g. found in green tea, berries, red wine)
Glutathione: the body's own endogenous antioxidant
Coenzyme Q10: essential in the mitochondrial electron transport chain

Electron Donors in Pharmacology

In pharmacology and medicinal chemistry, electron donors are relevant for understanding drug interactions and the chemical bonds formed between medications and their target molecules (receptors, enzymes). Many drugs act by functioning as an electron donor or electron acceptor when interacting with their target molecule, which forms the basis of their pharmacological activity.

Clinical Relevance

An imbalance in the cellular electron balance – for example, an excess of free radicals relative to available electron donors – is referred to as oxidative stress. Oxidative stress is a central mechanism in the development and progression of numerous diseases, including:

Cardiovascular diseases
Diabetes mellitus
Neurodegenerative diseases (e.g. Alzheimer's disease, Parkinson's disease)
Chronic inflammation
Ageing processes

The targeted supply of electron donors – for instance through an antioxidant-rich diet or appropriate dietary supplements – can help to reduce oxidative stress and support cellular health.

References

Nelson, D. L., Cox, M. M. (2021). Lehninger Principles of Biochemistry. 8th Edition. W. H. Freeman and Company, New York.
World Health Organization (WHO): Diet, Nutrition and the Prevention of Chronic Diseases. WHO Technical Report Series 916. Geneva, 2003.
Halliwell, B., Gutteridge, J. M. C. (2015). Free Radicals in Biology and Medicine. 5th Edition. Oxford University Press, Oxford.

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