title: Investigation on the interaction between luteolin and calf thymus DNA by spectroscopic techniques.
abstract: The interaction of luteolin with calf thymus deoxyribonucleic acid (ctDNA) under physiological conditions (Tris-HCl buffer solutions, pH 7.4) was studied by UV-Vis spectroscopy, fluorescence spectroscopy and viscosity measurement method, respectively. The results indicated that a complex of luteolin with ctDNA can be formed. Spectroscopic techniques together with viscosity determination provided evidences of intercalation mode of binding for the interaction between luteolin and ctDNA. The binding constant of luteolin to DNA calculated based on UV-Vis spectroscopy data was found to be 4.52×10(4)L mol(-1) at 310 K. The thermodynamic parameters of the complex were calculated by a double reciprocal method: Δ(r)H(m)(s)=-8.9×10(3)J mol(-1),Δ(r)S(m)(s)=60.5 JK(-1)mol(-1) and Δ(r)G(m)(s)=-2.76×10(4)J mol(-1) (310 K). The interacting forces between luteolin and DNA mainly included hydrophobic interactions and hydrogen bonds. The acridine orange displacement studies revealed that luteolin had significant effect for acridine orange bounded on DNA, which was indicative of intercalation binding.
authors: College of Chemistry and Chemical Engineering, Qufu Normal University, Shandong, Qufu 273165, PR China. zhshf999@sina.com
authors: Shufang
authors: S
authors: Zhang
authors: Baoping
authors: B
authors: Ling
authors: Fengli
authors: F
authors: Qu
authors: Xuejun
authors: X
authors: Sun
mesh_terms: D000042:Absorption; D000165:Acridine Orange / Q000378:metabolism; D000818:Animals; D001667:Binding, Competitive; D002417:Cattle; D004247:DNA / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D047311:Luteolin / Q000737:chemistry / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D014783:Viscosity
chemical_list: D004247:DNA; C427203:calf thymus DNA; D000165:Acridine Orange; D047311:Luteolin