Antioxidative activity hydroxyl groups kinds

Free radical formation is associated with the normal natural metabolism of aerobic cells. The oxygen consumption inherent to cell growth leads to the generation of a series of free radicals. The interaction of these species with molecules of a lipid nature produces new species such as hydroperoxides and different kinds of peroxides [135, 136], This group of radicals (superoxide, hydroxyl, and lipoid peroxides) may interact with biological systems in a cytotoxic manner. In this respect, it has been shown to posses an important antioxidant activity towards these radicals, which is mainly based on the properties of the hydroxyphenolic groups and the structural relations between the different parts of the chemical structure. Together with an ability to capture electrons, these... 

Five kinds of Schiff bases of chitosan and carboxymethyl chitosan (CMTS) have been prepared, and their respective antioxidant effect was dependent on contents of active hydroxyl and amino groups in molecular chains (Guo et al. 2005). 

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