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Updated: May 9, 2026

Evaluation of Oxidative Stress in Biological Samples Using the Thiobarbituric Acid Reactive Substances Assay
Published on: May 12, 2020
[Oxidative stress; a comparative study between normal and morbid obesity group population]
Leonardo De Tursi Ríspoli1, Antonio Vázquez Tarragón, Antonio Vázquez Prado
1Servicio de Cirugía General y Aparato Digestivo, Hospital General Universitario, Valencia, España.
Morbidly obese patients exhibit significantly higher levels of oxidative stress (OS) metabolites and lower antioxidant activity compared to normal-weight individuals. This study confirms pathological OS in obesity.
Area of Science:
- Biochemistry
- Clinical Medicine
- Obesity Research
Background:
- Obesity is a complex condition associated with numerous health risks.
- Oxidative stress (OS) plays a role in the pathophysiology of various diseases.
- Understanding OS levels in morbid obesity is crucial for clinical management.
Purpose of the Study:
- To quantify oxidative stress markers in morbidly obese patients.
- To compare OS levels between morbidly obese individuals and a healthy control group.
- To investigate the status of antioxidant systems in morbid obesity.
Main Methods:
- Blood and urine samples were analyzed for key OS metabolites (MDA, 8-oxo-dG, GSSG/GSH ratio) and glutathione (GSH).
- Statistical analyses included descriptive statistics, Kolmogorv-Smirnov test, Student's t test, and Mann-Whitney U test.
- A significance level of p < 0.05 was used for hypothesis testing.
Main Results:
- The morbidly obese group (n=28, BMI 50.1±4) showed significantly higher OS metabolite levels than the normal-weight group (n=28, BMI 23.9±6).
- Antioxidant system activity (GSH) was reduced in morbidly obese patients.
- Comorbidities were prevalent in the obese group (67.8%), while absent in the control group.
Conclusions:
- Elevated OS metabolite levels in morbidly obese patients confirm OS at a pathological level.
- The findings highlight a significant imbalance in redox status in morbid obesity.
- These results underscore the systemic impact of obesity on oxidative stress pathways.
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