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Which vitamin is antioxidant in edible oil? 

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In conclusion, the results of the study show that consumption of tomato products with olive oil but not with sunflower oil improves the antioxidant activity of the plasma.
In conclusion, the supplementation of refined olive oil with 200 mg/kg of vitamin E increases the stability of this oil under pro-oxidant conditions, and its intake decreases the oxidative damage generated by adriamycin in rats.
The study indicated that the contribution of antioxidant capacity in virgin coconut oil could be due to phenolic compounds.
The findings show that the extent of antioxidant activity of the essential oil and all extracts are in accordance with the amount of phenolics present in that extract.
Vitamin E supplementation markedly decreased fish oil induced antioxidant enzyme activities in all tissues.
The antioxidant activities of the oil were slightly lower than those of ascorbic acid or BHT, so the oil can be considered an effective natural antioxidant.
It was observed that the unrefined oils posses better antioxidant activity than the refined oils, which imply the importance of optimizing and/or modifying the existing steps in the vegetable oil processing to retain the polyphenolic content in vegetable oil without compromising other physicochemical parameters.
Results indicate that the extract of M. oleifera leaves is an effective antioxidant to prevent oxidation in fish oil.
In addition, this oil is a promising source of natural antioxidant agents.
The oil exhibited significant antioxidant activities.
Consequently, the total antioxidant capacity might be an indicator of quality attributes of edible oils, such as bioactivity and oxidative stability.
Discussion and conclusions: The antioxidant potential of the oil suggests that it may serve as a potential source for various preparations for pharmaceuticals and cosmeceuticals.
This paper reveals that the natural extracts have antioxidant activity comparable to that of synthetic antioxidants used in oil industry.
Validation results demonstrated that the method is able to measure the antioxidant activity of untreated edible oils as well as their hydrophilic and lipophilic extracts and posses all necessary quality factors required for routine analysis.

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Ameliorative effects of vitamin E in oxidative stress4 answersVitamin E has been shown to have ameliorative effects in oxidative stress. Studies have demonstrated that vitamin E supplementation can protect against high-fat diet-induced oxidative stress and hypoimmunity in turbot fish. Other vitamins, such as Vitamin K, Vitamin D, Niacin, Pyridoxine, and Riboflavin, have also been found to possess antioxidant properties and can reduce oxidative stress. In periparturient dairy cattle, vitamin E supplementation has been shown to restore normal health by minimizing the harmful effects of excessive reactive oxygen species (ROS) production. Additionally, vitamin E has been found to reduce the toxicity of organophosphate pesticides, such as phoxim, on rat intestinal tissue. In Karan Fries cows, vitamin E supplementation has been found to improve antioxidant activity and decrease oxidative stress. Overall, these studies highlight the potential of vitamin E as an effective antioxidant in mitigating oxidative stress.
How does vitamin A act as an antioxidant?5 answersVitamin A acts as an antioxidant by reducing lipid peroxidation and acting as a chain-breaking antioxidant. It is effective in reducing oxidative damage to cell compartments due to its lipid nature and localization within membranes and lipoproteins. Carotenoids, which are derivatives of vitamin A, can also participate in a biological antioxidant network by accepting and donating electrons and quenching singlet oxygen. Carotenoids are distributed in lipoproteins, membranes, and intracellular structures, often together with vitamin E, and have been associated with a reduced risk of chronic diseases. Vitamin A also plays a role in immune function, affecting innate and adaptive immune responses, lymphocyte differentiation, antibody production, and phagocytosis. However, excess vitamin A can have toxic effects.
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