Chapter 24

Free Radical-scavenging Activity of Marine Proteins and Peptides

Dai-Nghiep Ngo

Dai-Nghiep Ngo

Department of Biochemistry, Faculty of Biology, University of Science, VNU-HCM Ho Chi Minh City, Vietnam

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First published: 27 March 2013
Citations: 4

Summary

This chapter focuses on the free-radical activities of proteins and peptides extracted from marine sources, as well as on some methods for assaying antioxidant activities. Protein hydrolysate is produced by breaking down enzyme proteins into peptides, peptones and amino acids. Bioactive peptides isolated from various fish-protein hydrolysates have shown numerous bioactivities and the antioxidant peptides derived from marine sources have been determined to have antioxidant activity by various in vitro methods, including stable 1,1-diphenyl-2-picrylhydrazyl (DPPH), hydroxyl, alkyl and superoxide anion-radical scavenging effects, which have been detected by chemical or ESR spectroscopy and intracellular free radical-scavenging assays. The beneficial effects of antioxidant marine bioactive peptides are well known in scavenging of reactive oxygen species (ROS) and reactive nitrogen species (RNS) and in preventing oxidative damage by interrupting the radical chain reaction of lipid peroxidation.

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