Antioxidant markers are measurable biochemical indicators used to assess the balance between oxidative challenge and the body's protective antioxidant defenses, providing a quantitative picture of oxidative stress in cells, tissues, and biological fluids. They fall into complementary categories. Enzymatic markers in…
Antioxidant markers are measurable biochemical indicators used to assess the balance between oxidative challenge and the body's protective antioxidant defenses, providing a quantitative picture of oxidative stress in cells, tissues, and biological fluids. They fall into complementary categories. Enzymatic markers include the activities of superoxide dismutase, catalase, and glutathione peroxidase, which neutralize reactive oxygen species. Non-enzymatic markers include reduced glutathione, vitamins C and E, and other small-molecule scavengers, often summarized by integrative measures such as total antioxidant capacity. Markers of oxidative damage, in turn, quantify the consequences of imbalance, including lipid peroxidation products like malondialdehyde, protein carbonyls, and oxidized DNA bases. Interpreted together, these indicators reveal whether oxidant production has outstripped antioxidant capacity, a state implicated in inflammation, aging, metabolic disorders, and tissue injury. Antioxidant markers are widely applied in nutritional and pharmacological research to evaluate how diet, micronutrients, plant-derived compounds, and candidate therapeutics modulate redox status, and in disease studies to monitor oxidative burden and the response to intervention. Because individual markers fluctuate with sampling, assay method, and physiological context, sound use depends on validated analytical procedures and, ideally, panels that combine measures of both defense and damage. As objective readouts of redox biology, antioxidant markers connect mechanistic understanding of oxidative stress to practical assessment of health, disease progression, and treatment efficacy.
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