How does tocopherol act as an antioxidant?
How does tocopherol act as an antioxidant?
Tocopherols belong to a class of phenolic antioxidants which can inhibit lipid autoxidation by scavenging free radicals and by reacting with singlet oxygen. In vegetable oils alpha-tocopherol inhibits the effects of singlet oxygen during sensitized photoxidation.
What is the mechanism of action of vitamin E?
The mechanism of vitamin E (alpha-tocopherol)-mediated low-density lipoprotein lipid peroxidation. It has been found that alpha-tocopherol mainly inhibits the production of new free radicals, while gamma-tocopherol traps and neutralises the existing free radicals.
What is the mechanism of action of antioxidant?
An antioxidant is a substance that at low concentrations delays or prevents oxidation of a substrate. Antioxidant compounds act through several chemical mechanisms: hydrogen atom transfer (HAT), single electron transfer (SET), and the ability to chelate transition metals.
What does a tocopherol do?
Vitamin E (also known as tocopherol or alpha-tocopherol) is a nutrient that is important for many body processes. It helps your nerves and muscles work well, prevents blood clots, and boosts the immune system. Vitamin E is a type of antioxidant, a substance that protects cells from damage.
Is Tocopherol a natural antioxidant?
Natural Tocopherols were one of the first liposoluble antioxidants isolated from plants. Due to its high concentration and habitual presence in vegetable oils and other plants with high concentration of lipids, Tocopherol is the most common antioxidant in nature.
Is riboflavin an antioxidant?
Some nutrients such as vitamin C, vitamin E and carotenoids are known to act as antioxidants; however, riboflavin is one of the neglected antioxidant nutrients that may have an antioxidant action independently or as a component of the glutathione redox cycle.
What is the main function of vitamin E in the body quizlet?
The primary function of vitamin E is as an antioxidant, but it also has other roles in the body.
How do antioxidants remain stable?
Antioxidants donate an electron to ROS to stabilize them, without becoming free radicals themselves. The body cells manufacture many of these antioxidants to ward off invading organisms.
What are the criteria for the selection of antioxidants?
An antioxidant must be stable , natural, assimilable by tissues and easily obtainable from a natural source… Also, it must chelate various divalent metallic cations , activate antioxidant enzymes , inhibit superoxid dismutase producting enzymes and not show aouto-oxidation physiological pH …
Is Selenium an antioxidant?
As to their biological action mechanism selenium and its compounds are antioxidants. Selenium is active immunomodulator, much more potent anti-oxidant than vitamins E, C and A, beta-carotene, but much more toxic.
What is the role of tocopherol as an antioxidant?
From Antioxidant Effect to Food Freshness Retention. 1) Mechanism of oxidation of fats and oils and function of TOCOPHEROL as an antioxidant: The formation of peroxides by auto-oxidation of fats and oils occurs by the following mechanism: In general, edible fats and oils consist of unsaturated fatty acids.
How does tocopherol scavenge radicals?
TOCOPHEROL scavenges radicals in the following manner: 2) Function of TOCOPHEROL as a food freshness retainer. TOCOPHEROL is recommended to be used as antioxidants for not only edible fats and oils but also for foods containing fats and oils regardless of the amount.
What is the function of tocopherol as a food freshness retainer?
2) Function of TOCOPHEROL as a food freshness retainer. TOCOPHEROL is recommended to be used as antioxidants for not only edible fats and oils but also for foods containing fats and oils regardless of the amount. A rancid odor is generated by the oxidation of lipids and it is emitted independently of lipid content.
What are the synergists of tocopherol?
The following substances are also known to act synergistically with Tocopherol; citric acids, EDTA which chelate metals, in particular Cu and Fe, from the reaction system, phospholipids, amino acids, peptides, and melanoidin. To obtain a better effect as an antioxidant it is suggested to use TOCOPHEROL along with a synergist.
