title: Effects of addition of egg ovotransferrin-derived peptides on the oxygen radical absorbance capacity of different teas.
abstract: Ovotransferrin-derived peptides showed synergistic effects with vitamin C, epigallocatechin gallate (EGCG), and caffeic acid, but not quercetin in our previous report. In this study, we further investigated the interactions between ovotransferrin-derived peptides and teas, based on the oxygen radical absorbance capacity (ORAC) assay. Our results showed that there was no significant difference in ORAC values among green, oolong, and black teas. For all the samples, 80% methanol extracts possessed better antioxidant capacity than hot water extracts. The antioxidant capacity of teas were improved by adding either ovotransferrin hydrolysate or its purified peptide IRW; however, adding hydrolysate did not improve antioxidant stability of teas. ORAC values of both teas and hydrolysate added teas were decreased during 22weeks of storage, while samples stored at 4°C exhibited higher antioxidant capacity than those stored at room temperature. This suggested that ovotransferrin hydrolysate could be used as functional food ingredients in enhancing antioxidant capacities of foods, which would benefit human nutrition and health.
authors.affiliation: Department of Functional Food and Bio-active Compounds, Institute of Agro-food Science and Technology, Jiangsu Academy of Agricultural Sciences, PR China.
authors.forename: Wuyang
authors.initials: W
authors.lastname: Huang
authors.forename: Shengwen
authors.initials: S
authors.lastname: Shen
authors.forename: Chamila
authors.initials: C
authors.lastname: Nimalaratne
authors.forename: Sen
authors.initials: S
authors.lastname: Li
authors.forename: Kaustav
authors.initials: K
authors.lastname: Majumder
authors.forename: Jianping
authors.initials: J
authors.lastname: Wu
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D003207:Conalbumin / Q000737:chemistry*; D061353:Food Storage; D016166:Free Radical Scavengers / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry*; D017382:Reactive Oxygen Species / Q000737:chemistry*; D013662:Tea / Q000737:chemistry*; D013696:Temperature
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D010455:Peptides; D017382:Reactive Oxygen Species; D013662:Tea; D003207:Conalbumin