title: Hemolysis assessment and antioxidant activity evaluation modified in an oxidized erythrocyte model.
abstract: Hydrogen peroxide (H₂O₂)-induced hemolysis is a commonly used model for antioxidant activity evaluation, and the hemolysis index is often presented as the absorbance of supernatant hemoglobin (Hb), which releases from injured cells. However, in previous studies, as an oxidation-sensitive protein, it has been recognized that Hb easily forms other types or substances, such as metHb, Heinz, and some fluorescent products. This study concerns whether Hb oxidation participated in H₂O₂-induced hemolysis and confirmed that the destruction of Hb under oxidizing condition had been a novel interfering factor that could reduce the absorbance in Hb quantitative detection. To correct the lower absorbance, the stable fluorescent products found in Hb degradation were selected, and the absorbance correction factor of 6.436 was drawn on the basis of the absorbance and fluorescent intensity. This correction factor obviously altered the results of both dose-dependent hemolysis of H₂O₂ and antioxidant activity. In addition, the assessment difference was innovatively discussed by altering the sequences of adding antioxidant and oxidant. These different sequences caused variations in hemolysis, indicating that multiple evaluations may be related to the antioxidant pathways which are necessary for more accurate bioactivity data.
authors.affiliation: College of Food Science and Engineering, Hanjiang District, Yangzhou University , 196 Huayang Western Road, Yangzhou 225127, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Xu
authors.forename: Jiayi
authors.initials: J
authors.lastname: He
authors.forename: Guoyan
authors.initials: G
authors.lastname: Liu
authors.forename: Xinyu
authors.initials: X
authors.lastname: Diao
authors.forename: Yingying
authors.initials: Y
authors.lastname: Cao
authors.forename: Qun
authors.initials: Q
authors.lastname: Ye
authors.forename: Guangxin
authors.initials: G
authors.lastname: Xu
authors.forename: Wendong
authors.initials: W
authors.lastname: Mao
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D004912:Erythrocytes / Q000737:chemistry* / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D006454:Hemoglobins / Q000378:metabolism; D006461:Hemolysis / Q000187:drug effects; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008954:Models, Biological; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000187:drug effects
chemical_list: D000975:Antioxidants; D006454:Hemoglobins; D006861:Hydrogen Peroxide