Reactive antioxidants

L17. Lissi, E., Salim-Hanna, M., Pascual, C., and del Castillo, M. D., Evaluation of total antioxidant potential (TRAP) and total antioxidant reactivity from luminol-enhanced chemiluminescence measurements. Free Radic. Biol. Med. 18, 153-158 (1995). 

Compared to conventional antioxidants, reactive antioxidants that are capable of becoming covalently bound to the polymer backbone are not readily lost from polymers during fabrication and in-service. There is a lot of evidence that demonstrates the performance (in terms of polymer protection) of immobilized antioxidants in practice, especially when polymer products are subjected to harsh environment, e.g., exposure to high temperatures, UV-light and leaching solvents. It is clear from this that high mobility of low molar mass antioxidants is not a necessary prerequisite to achieving stabilization and attachment of antioxidants to polymers can be industrially beneficial. 

Tolal reactive antioxidant potential (TRAP) and total antioxidant reactivity (TAR) are expressed in (M Trolox equivalents. CL and TBARS are expressed as ICjo ((g/ml), and include 95% confidence intervals. 

Table 7. Total Reactive Antioxidant Potential (TRAP) and Total Antioxidant Reactivity (TAR) in (M Trolox Equivalents Number of Radicals (n) Trapped Per Molecule of Additive, ICso s and Percentage of Efficiency, Obtained From the Quenching of Luminol Chemiluminescence in Methanolic Extracts and Isolated Compounds of Pothomorphe spp.

See also Antioxidants, Reactive Oxygen, Oxygen Metabolism and Human Disease, P-Carotene, G Proteins in Vision, Lipid-Soluble Vitamins, Vitamins... 

Roginskii, VA. Phenolic Antioxidants Reactivity and Performance. Moscow Nauka, 1988, 247 (in Russian). 

Reactive Antioxidants. Reactive antioxidants are compounds containing one or more antioxidant functions (the antioxidant component) and one or more chemical functions capable of reacting either with monomers (same or different) or with polymers (the reactive component). The antioxidant... 

Another way to make phenolic antioxidants reactive toward alkyl radicals is to introduce a more reactive group. It is shown that phenolic antioxidants with an unsaturated side chain can scavenge alkyl radicals [77]. A phenolic antioxidant containing such a moiety was developed by Yachigo et al. (Sumitomo Chemicals) [78,79]. For its mechanism, see Scheme 18.8. 

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