What makes a good radical scavenger?
The most important radical scavengers are the phenolic antioxidants. They convert peroxy radicals into hydroperoxides and are themselves converted to phenoxy radicals. The phenoxy radical can in different ways react with another peroxy radical resulting in nonradical products (Scheme 23.7).
What is the reactivity of free radicals?
Free radicals are highly reactive and very unstable. They can donate an electron or accept an electron from other molecules, therefore, can behave as oxidants or reactants.
What is phenoxy radical?
Phenolic radical is an organic radical generated from phenol.
What is scavenging of free radicals?
A substance, such as an antioxidant, that helps protect cells from the damage caused by free radicals. Free radicals are unstable molecules that are made during normal cell metabolism (chemical changes that take place in a cell).
Why are free radicals a problem?
Free radicals damage contributes to the etiology of many chronic health problems such as cardiovascular and inflammatory disease, cataract, and cancer. Antioxidants prevent free radical induced tissue damage by preventing the formation of radicals, scavenging them, or by promoting their decomposition.
What helps with free radicals?
Because free radicals are so pervasive, you need an adequate supply of antioxidants to disarm them. Your body’s cells naturally produce some powerful antioxidants, such as alpha lipoic acid and glutathione. The foods you eat supply other antioxidants, such as vitamins C and E.
Which radicals most reactive?
hydroxyl radical
The hydroxyl radical is particularly unstable and is the most reactive of the free radical molecules. In addition, it is capable of reacting rapidly and non-specifically with most biological molecules (34, 43).
What are phenoxy resins?
Phenoxy resins (phenoxies) are amorphous polymers that will not crystallize or build up stress concentrations. Phenoxy resin chemistry contains no additives, have low order of residual monomers and low molecular weight extractibles.
How do phenoxy herbicides work?
Today they remain amongst the world’s most widely used herbicides, providing farmers and other users with broadleaf weed control in a multitude of agricultural and non-agricultural uses. Phenoxys work by disrupting plant cell growth and form a part of the Group I herbicides.
What is ABTS radical scavenging activity?
The ABTS assay measures the relative ability of antioxidants to scavenge the ABTS generated in aqueous phase, as compared with a Trolox (water soluble vitamin E analogue) standard. The ABTS is generated by reacting with a strong oxidizing agent (eg, potassium permanganate or potassium persulfate) with the ABTS salt.
How do antioxidants scavenge free radicals?
Antioxidants neutralize free radicals by giving up some of their own electrons. In making this sacrifice, they act as a natural “off” switch for the free radicals. This helps break a chain reaction that can affect other molecules in the cell and other cells in the body.