Free radicals are oxygen-containing molecules with an uneven number of electrons. The uneven number allows them to easily react with other molecules. Free radicals can cause large chain chemical reactions in your body because they react so easily with other molecules. These reactions are called oxidation.
What are free radicals PPT?
A free radical is a molecule or molecular fragment that contains one or more unpaired electrons in its outermost orbital. Free radical is generally represented by superscript dot.
How are free radicals formed in the body?
When cells use oxygen to generate energy, free radicals are created as a consequence of ATP (adenosine triphosphate) production by the mitochondria. These by-products are generally reactive oxygen species (ROS) as well as reactive nitrogen species (RNS) that result from the cellular redox process.
What are free radicals with examples?
Table 1
| Free radical | Symbol | Half-life |
|---|---|---|
| Hydrogen peroxide | H2O2 | Stable |
| Singlet oxygen | 1O2 | 10−6 s |
| Ozone | O3 | s |
| Organic peroxide | ROOH | Stable |
What vitamins reduce free radicals?
Although there are several enzyme systems within the body that disarm free radicals, the principal antioxidants are vitamin E, beta-carotene, vitamin C, and selenium. When these antioxidants neutralize free radicals by donating an electron particle they are left with a small problem.
What are some examples of free radicals in humans?
There are many types of free radicals, though, in humans, the most significant are oxygen free radicals (reactive oxygen species). Examples include singlet oxygen (when oxygen is “split” into single atoms with unpaired electrons), hydrogen peroxide, superoxides, and hydroxyl anions. You may wonder where free radicals come from in the first place.
What happens when a free radical is attacked?
Thus the attacked molecule loses its electron and becomes a free radical itself, beginning a chain reaction cascade which finally damages the living cell [9]. Both ROS and RNS collectively constitute the free radicals and other non radical reactive species [10].
How can I reduce my exposure to free radicals?
Reducing your exposure to free radicals include both avoiding their sources (carcinogens) and providing your body with healthy antioxidants in your diet. Lifestyle measures to reduce exposure include not smoking, avoiding processed foods, practicing caution with any chemicals you work with at home or on the job, and more.
Is oxygen a free radical or not?
Oxygen as a free radical Probably the most well-known free radical, oxygen is the basis for development of most free radicals in the body. Inherently, oxygen is an unstable molecule. 7. During metabolism, the O2 molecule splits and energy is released.
