title: Spectroscopic studies on the interaction of bovine serum albumin with surfactants and apigenin.
abstract: The binding of apigenin (Ap) to bovine serum albumin (BSA) has been studied using the methods of fluorescence spectroscopy and UV-vis absorption spectroscopy. The spectroscopic analysis of the quenching mechanism indicates that the quenching constants are inversely correlated with the temperatures and the quenching process could result from a static interaction. The type of interaction force was discussed and the binding site of Ap was in site I (subdomain IIA) of BSA. The thermodynamic parameters ΔH and ΔS are -42.02kJ mol(-1) and -48.31J mol(-1)K(-1), respectively and the negative ΔG implying that the binding interaction was spontaneous. The distance r between BSA and Ap was calculated according to Förster's theory and the value is 3.44nm. The synchronous and three-dimensional fluorescence spectra show that the binding of Ap to BSA could lead to the changes in the conformation and microenvironment of BSA. At the same time, the effects of ionic surfactants on the interaction of Ap and BSA have also been investigated.
authors.affiliation: Experimental Center, Henan Institute of Science and Technology, Xinxiang 453003, PR China.
authors.forename: Xu-Na
authors.initials: XN
authors.lastname: Zhao
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Li-Yuan
authors.initials: LY
authors.lastname: Niu
authors.forename: Chen-Ping
authors.initials: CP
authors.lastname: Zhao
mesh_terms: D000818:Animals; D047310:Apigenin / Q000737:chemistry / Q000378:metabolism*; D001665:Binding Sites; D002417:Cattle; D004735:Energy Transfer; D007477:Ions; D007700:Kinetics; D011487:Protein Conformation; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000378:metabolism*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013501:Surface-Active Agents / Q000737:chemistry / Q000378:metabolism*; D013816:Thermodynamics
chemical_list: D007477:Ions; D000644:Quaternary Ammonium Compounds; D012996:Solutions; D013501:Surface-Active Agents; C013912:decyltrimethylammonium; D012710:Serum Albumin, Bovine; D012967:Sodium Dodecyl Sulfate; D047310:Apigenin