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In vitro antioxidant activities of ascorbic acid, blueberry anthocyanins (BA), chitosan-blueberry anthocyanins-alginate (CS-BA-ALG) NPs and CS-ALG NPs. (A) DPPH radical scavenging assay; (B) ABTS+ radical scavenging assay; CS-BA-ALG NPs were based on the actual concentration of BA encapsulated in the NPs (calculated from LC%).
