title: Study of interaction between human serum albumin and three antioxidants: ascorbic acid, α-tocopherol, and proanthocyanidins.
abstract: Ascorbic acid, α-tocopherol and proanthocyanidins are three classic dietary antioxidants. In this study, the interaction between the three antioxidants and human serum albumin (HSA) was investigated by several spectroscopic techniques. Experimental results proved that the three antioxidants quench the fluorescence of HSA through a static (proanthocyanidins) or static-dynamic combined quenching mechanism (ascorbic acid and α-tocopherol). Thermodynamic investigations revealed that the combination between ascorbic acid or proanthocyanidins and HSA was driven mainly by electrostatic interaction, and the hydrophobic interactions play a major role for α-tocopherol-HSA association. Binding site I was found to be the primary binding site for ascorbic acid and proanthocyanidins, and site II for α-tocopherol. Additionally, the three antioxidants may induce conformational and microenvironmental changes of HSA.
authors.affiliation: School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China; Department of Chemistry, School of Basic Medicine, Xinxiang Medical University, Xinxiang, Henan 453003, PR China. Electronic address: lixiangrong79@sohu.com.
authors.forename: Xiangrong
authors.initials: X
authors.lastname: Li
authors.forename: Dejun
authors.initials: D
authors.lastname: Chen
authors.forename: Gongke
authors.initials: G
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Lu
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D001205:Ascorbic Acid / Q000737:chemistry*; D001665:Binding Sites; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D015394:Molecular Structure; D044945:Proanthocyanidins / Q000737:chemistry*; D012709:Serum Albumin / Q000737:chemistry*; D055672:Static Electricity; D013816:Thermodynamics; D024502:alpha-Tocopherol / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D044945:Proanthocyanidins; D012709:Serum Albumin; D024502:alpha-Tocopherol; D001205:Ascorbic Acid
keywords: Antioxidants; Fluorescence spectroscopy; Fourier transform infrared (FT-IR) spectroscopy; Human serum albumin; UV–vis absorption spectroscopy