A free radical is a molecule with an unpaired electron. The molecule is reactive and seeks another electron to pair.[1] Free radicals are involved in the mechanisms of damage associated with disease development. Examples are hydrogen peroxide, hypochlorite, nitric oxide and nitrogen dioxide.[2]
A radical is an atom or group of an (?) which possesses electric charge.[3] There are two types of radicals: Cation and anion. Cation are positively charged while anion are negatively charged.[4] Examples of cation are Calcium (Ca2+), Potassium (K+), Hydrogen (H+).[5] Examples of anion are Iodide (I-), Chlorine (Cl-) and Hydroxide (OH-).[6]
The need for antioxidants in peoples’ daily life is becoming more critical with increased exposure to free radicals.[7] Pollution, cigarette smoke, drugs, illness and stress can increase our exposure.
References
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