Chitosan is an important biopolymer produced from the deacetylation of several seas and insect crusts. Due to its environmental fate and biological biocompatibility, it can be used in several biological and environmental applications. In this review, the potential application of chitosan biopolymer was reviewed due to it is considered an environmental, sustainable, and biologically safe plate form for producing several antioxidants. The different antioxidants fabricated from chitosan biopolymer- an active substrate- and the functional role of the diverse groups, either in chitosan backbone or in the coupled species with chitosan, were reviewed. Different antioxidant types were described, reviewed, and compared with the most famous and traditional antioxidants, such as ascorbic acid, citric acid, and gallic acid. Additionally, the different methods and techniques used in determining the antioxidative tendencies of the antioxidants were extensively described and reviewed.
Keywords: 1,1-Diphenyl-2-picrylhydrazyl radical; Antioxidant; Ascorbic acid; Chitosan; Citric acid; Hydroxyl radicals; Reducing power; Superoxide radical.
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