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In atmospheric chemistry, the most common scavenger is the hydroxyl radical, a short-lived radical produced photolytically in the atmosphere. It is the most important oxidant for carbon monoxide, methane and other hydrocarbons, sulfur dioxide, hydrogen sulfide, and most of other contaminants, removing them from the atmosphere.
Radical scavengers: scavenges free radicals to halt the chain reaction. This can be any radical in the oxidation cycle (R•, ROO•, RO•, •OH), though in practice RO• and •OH are too reactive to "trap". Common types include lactones (esp. substituted benzofuranone) and acrylated bis-phenols. [33] [30]
2,4,6-TTBP is used as stabilizers, free-radical scavengers and antioxidants in technical applications, such as in fuels, hydraulic fluids and lubricating oils, as well as in elastomeric and thermoplastic polymers.
The body does have a way to fight back — with antioxidants. Nicknamed “free radical scavengers,” antioxidants can prevent and repair damage caused by some types of free radicals, experts say.
Pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate): A primary antioxidant consisting of sterically hindered phenols with para-propionate groups. Primary antioxidants (also known as chain-breaking antioxidants) act as radical scavengers and remove peroxy radicals (ROO•), as well as to a lesser extent alkoxy radicals (RO•), hydroxyl radicals (HO•) and alkyl radicals (R•).
Radical polymerisation of unsaturated monomers is generally propagated by C-radicals. These can be effectively terminated by combining with other radicals to form neutral species and many true inhibitors operate through this mechanism. In the simplest example oxygen can be used as it exists naturally in its triplet state (i.e. it is a diradical).
By acting as a free radical scavenger, hydroquinone serves to prolong the shelflife of light-sensitive resins such as preceramic polymers. [22] Hydroquinone can lose a hydrogen cation from both hydroxyl groups to form a diphenolate ion.
Shinya, Kazuo; Furihata, Kazuo; Teshima, Yoshihiro; Hayakawa, Yoichi; Seto, Haruo (July 1993). "Benthocyanins B and C, new free radical scavengers from Streptomyces ...