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Antioxidant Activity and Oxidative Stress
Research Guide
What is Antioxidant Activity and Oxidative Stress?
Antioxidant activity refers to the capacity of substances to neutralize reactive oxygen species and inhibit oxidative damage such as lipid peroxidation, while oxidative stress occurs when the production of these reactive species exceeds the body's antioxidant defenses, leading to cellular harm in conditions like atherosclerosis and cancer.
This field encompasses 68,412 papers on oxidative stress, antioxidants, lipid peroxidation, and carotenoids in health conditions including cardiovascular disease and eye health. Key methods include assays like thiobarbituric acid reaction for lipid peroxides and ABTS radical cation decolorization for antioxidant activity. Research examines reactive oxygen species, biomarkers, and vitamin E's role in mitigating oxidative damage.
Topic Hierarchy
Research Sub-Topics
Lipid Peroxidation Biomarkers
This sub-topic develops and validates assays for malondialdehyde, F2-isoprostanes, and other lipid peroxidation products as oxidative stress markers. Researchers correlate biomarker levels with disease progression in clinical cohorts.
Antioxidant Enzyme Systems
This sub-topic investigates regulation and function of superoxide dismutase, catalase, and glutathione peroxidase in cellular redox homeostasis. Researchers study enzyme polymorphisms and their disease associations.
Vitamin E Oxidative Stress Protection
This sub-topic examines alpha-tocopherol's role in preventing lipid peroxidation and its interactions with other antioxidants. Researchers conduct intervention trials assessing vitamin E efficacy in cardiovascular and neurodegenerative diseases.
Carotenoids Reactive Oxygen Scavenging
This sub-topic explores singlet oxygen quenching and radical scavenging by beta-carotene, lutein, and zeaxanthin in membranes and eye tissues. Researchers investigate bioavailability and tissue-specific accumulation.
Oxidative Stress in Atherosclerosis
This sub-topic elucidates how reactive oxygen species promote endothelial dysfunction, LDL oxidation, and plaque formation in atherosclerosis. Researchers test antioxidant interventions in vascular cell and animal models.
Why It Matters
Antioxidant activity measurements enable evaluation of compounds' potential to prevent oxidative stress-related diseases. Ohkawa et al. (1979) developed the thiobarbituric acid assay for lipid peroxides in animal tissues, cited 28,543 times, which standardized detection of oxidative damage in atherosclerosis and cancer studies. Re et al. (1999) improved the ABTS assay for antioxidant activity, applied in assessing flavonoids and phenolics against reactive oxygen species in cardiovascular health (24,734 citations). Brand-Williams et al. (1995) introduced a free radical method for antioxidants, facilitating research on carotenoids and vitamin E in inflammation and cancer prevention (24,438 citations). These tools support biomarker analysis for clinical interventions.
Reading Guide
Where to Start
'Assay for lipid peroxides in animal tissues by thiobarbituric acid reaction' by Ohkawa et al. (1979) is the starting point, as it provides a foundational, highly cited (28,543 times) method for measuring oxidative damage central to the field.
Key Papers Explained
Ohkawa et al. (1979) in 'Assay for lipid peroxides in animal tissues by thiobarbituric acid reaction' established lipid peroxidation measurement, which Re et al. (1999) in 'Antioxidant activity applying an improved ABTS radical cation decolorization assay' complemented with antioxidant evaluation (24,734 citations). Brand-Williams et al. (1995) in 'Use of a free radical method to evaluate antioxidant activity' built on these for DPPH-based assays (24,438 citations). Buege and Aust (1978) in '[30] Microsomal lipid peroxidation' detailed microsomal mechanisms, while Rice‐Evans et al. (1996) in 'Structure-antioxidant activity relationships of flavonoids and phenolic acids' linked structures to activity. Dröge (2002) in 'Free Radicals in the Physiological Control of Cell Function' integrated physiological roles.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research centers on assay refinements and biomarker validation from top papers like Ohkawa et al. (1979) and Re et al. (1999). Halliwell and Gutteridge (2015) in 'Free Radicals in Biology and Medicine' updates reactive species roles. No recent preprints available.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Assay for lipid peroxides in animal tissues by thiobarbituric ... | 1979 | Analytical Biochemistry | 28.5K | ✕ |
| 2 | Antioxidant activity applying an improved ABTS radical cation ... | 1999 | Free Radical Biology a... | 24.7K | ✕ |
| 3 | Use of a free radical method to evaluate antioxidant activity | 1995 | LWT | 24.4K | ✓ |
| 4 | [30] Microsomal lipid peroxidation | 1978 | Methods in enzymology ... | 13.1K | ✕ |
| 5 | [34] Chlorophylls and carotenoids: Pigments of photosynthetic ... | 1987 | Methods in enzymology ... | 12.9K | ✕ |
| 6 | Free Radicals in the Physiological Control of Cell Function | 2002 | Physiological Reviews | 9.7K | ✕ |
| 7 | Structure-antioxidant activity relationships of flavonoids and... | 1996 | Free Radical Biology a... | 8.8K | ✕ |
| 8 | Free Radicals in Biology and Medicine | 2015 | Oxford University Pres... | 8.7K | ✕ |
| 9 | Chlorophyll fluorescence—a practical guide | 2000 | Journal of Experimenta... | 8.5K | ✕ |
| 10 | The determination of flavonoid contents in mulberry and their ... | 1999 | Food Chemistry | 8.3K | ✕ |
Frequently Asked Questions
What is the thiobarbituric acid assay for lipid peroxidation?
The thiobarbituric acid assay measures lipid peroxides in animal tissues by reacting with malondialdehyde. Ohkawa et al. (1979) detailed this method in 'Assay for lipid peroxides in animal tissues by thiobarbituric acid reaction,' enabling quantification of oxidative damage. It is widely used in studies of atherosclerosis and biomarkers.
How does the ABTS assay evaluate antioxidant activity?
The ABTS assay applies radical cation decolorization to assess antioxidants. Re et al. (1999) improved this method in 'Antioxidant activity applying an improved ABTS radical cation decolorization assay,' measuring capacity to scavenge reactive species. It supports analysis of flavonoids and carotenoids in health applications.
What role do reactive oxygen species play in cell function?
Reactive oxygen species like superoxide and nitric oxide damage cells at high levels but regulate function at moderate concentrations. Dröge (2002) reviewed this in 'Free Radicals in the Physiological Control of Cell Function,' noting impacts on inflammation and disease. Antioxidants mitigate excess to prevent oxidative stress.
How are structure-antioxidant relationships determined for flavonoids?
Flavonoids and phenolic acids' antioxidant activity correlates with molecular structure. Rice‐Evans et al. (1996) analyzed this in 'Structure-antioxidant activity relationships of flavonoids and phenolic acids,' linking radical-scavenging to health benefits. The work guides applications in cancer prevention.
What methods detect microsomal lipid peroxidation?
Microsomal lipid peroxidation is assayed through specific enzymatic protocols. Buege and Aust (1978) described this in '[30] Microsomal lipid peroxidation,' providing techniques for oxidative stress research. It aids studies on carotenoids and vitamin E.
What is the current state of research on oxidative stress and antioxidants?
The field includes 68,412 papers focusing on biomarkers, lipid peroxidation, and antioxidants like vitamin E. Halliwell and Gutteridge (2015) cover free radicals' roles in 'Free Radicals in Biology and Medicine.' No recent preprints or news reported in the last 6-12 months.
Open Research Questions
- ? How do moderate levels of reactive oxygen species precisely regulate physiological cell functions without causing damage?
- ? What structural features of flavonoids optimize their antioxidant activity against specific reactive species in disease models?
- ? Can standardized assays like ABTS and thiobarbituric acid accurately predict clinical outcomes in oxidative stress-related conditions?
- ? What are the long-term effects of carotenoids and vitamin E supplementation on biomarkers of lipid peroxidation in atherosclerosis?
- ? How do free radicals influence inflammation and cancer progression at the molecular level?
Recent Trends
The field holds steady at 68,412 papers with no reported 5-year growth data.
Highly cited works like Ohkawa et al. (1979; 28,543 citations) and Re et al. (1999; 24,734 citations) continue dominating citations.
No preprints or news in the last 6-12 months indicate stable focus on established assays and physiological roles from Dröge .
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