title: Antioxidant properties of a new antioxidative peptide from algae protein waste hydrolysate in different oxidation systems.
abstract: Microalgae have been a popular edible food, but there are no known reports on the antioxidative peptides derived from microalgae. The algae protein waste, which is normally discarded as animal feed, is a by-product during production of algae essence from microalgae, Chlorella vulgaris. Algae protein waste was hydrolyzed using pepsin, and a potent antioxidative peptide of VECYGPNRPQF was separated and isolated. The peptide could efficiently quench a variety of free radicals, including hydroxyl radical, superoxide radical, peroxyl radical, DPPH radical and ABTS radicals, and performed more efficiently than that observed for BHT, Trolox and peptides from marine protein sources in most cases. The purified peptide also has significant protective effects on DNA and prevents cellular damage caused by hydroxyl radicals. In addition, the peptide has gastrointestinal enzyme-resistance and no cytotoxicity observed in human lung fibroblasts cell lines (WI-38) in vitro. These results demonstrate that inexpensive algae protein waste could be a new alternative to produce antioxidative peptides.
authors.affiliation: Department of Food Science and Biotechnology, National Chung Hsing University, Taichung, Taiwan, ROC.
authors.forename: I-Chuan
authors.initials: IC
authors.lastname: Sheih
authors.forename: Tung-Kung
authors.initials: TK
authors.lastname: Wu
authors.forename: Tony J
authors.initials: TJ
authors.lastname: Fang
mesh_terms: D000975:Antioxidants / Q000032:analysis* / Q000378:metabolism*; D001709:Biotechnology / Q000379:methods*; D001713:Biphenyl Compounds / Q000737:chemistry; D045744:Cell Line, Tumor; D048408:Chlorella vulgaris / Q000378:metabolism; D002839:Chromans / Q000737:chemistry; D004249:DNA Damage; D056890:Eukaryota / Q000378:metabolism*; D005347:Fibroblasts / Q000187:drug effects*; D006801:Humans; D017665:Hydroxyl Radical / Q000737:chemistry / Q000378:metabolism; D020128:Inhibitory Concentration 50; D010100:Oxygen / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry*; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D002839:Chromans; D010455:Peptides; D010851:Picrates; D010936:Plant Extracts; D017665:Hydroxyl Radical; C004931:1,1-diphenyl-2-picrylhydrazyl; C010643:6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid; D010100:Oxygen