title: Molecular spectroscopic studies on the interaction of ferulic acid with calf thymus DNA.
abstract: The interaction between ferulic acid and calf thymus deoxyribonucleic acid (ctDNA) under physiological conditions (Tris-HCl buffer solutions, pH 7.4) was investigated by UV-Vis spectroscopy, fluorescence spectroscopy, DNA melting techniques, and viscosity measurements. Results indicated that a complex of ferulic acid with ctDNA was formed with a binding constant of K(290K)=7.60×10(4) L mol(-1) and K(310K)=4.90×10(4) L mol(-1). The thermodynamic parameters enthalpy change (ΔH°), entropy change (ΔS°) and Gibbs free energy (ΔG°) were calculated to be -1.69×10(4) J mol(-1), 35.36 J K(-1) mol(-1) and -2.79×10(4) J mol(-1) at 310 K, respectively. The acting forces between ferulic acid and DNA mainly included hydrophobic interaction and hydrogen bonds. Acridine orange displacement studies revealed that ferulic acid can substitute for AO probe in the AO-DNA complex which was indicative of intercalation binding. Thermal denaturation study suggested that the interaction of ferulic acid with DNA could result in the increase of the denaturation temperature, which indicated that the stabilization of the DNA helix was increased in the presence of ferulic acid. Spectroscopic techniques together with melting techniques and viscosity determination provided evidences of intercalation mode of binding for the interaction between ferulic acid and ctDNA.
authors: College of Chemistry and Chemical Engineering, Qufu Normal University, Shandong, Qufu 273165, People's Republic of China. zhshf999@sina.com
authors: Shufang
authors: S
authors: Zhang
authors: Xuejun
authors: X
authors: Sun
authors: Fengli
authors: F
authors: Qu
authors: Rongmei
authors: R
authors: Kong
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D002417:Cattle; D003373:Coumaric Acids / Q000737:chemistry / Q000494:pharmacology*; D004247:DNA / Q000737:chemistry / Q000378:metabolism*; D007364:Intercalating Agents / Q000737:chemistry / Q000494:pharmacology*; D009691:Nucleic Acid Denaturation / Q000187:drug effects; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics
chemical_list: D000975:Antioxidants; D003373:Coumaric Acids; D007364:Intercalating Agents; D004247:DNA; C427203:calf thymus DNA; C004999:ferulic acid