title: Synthesis, characterization, cytotoxic activities, and DNA-binding properties of the La(III) complex with Naringenin Schiff-base.
abstract: A new Naringenin Schiff-base ligand (H3L) and its complex, [La(H2L)2(NO3).3H2O], have been synthesized and characterized on the basis of elemental analyses, molar conductivities, mass spectra, 1H NMR, thermogravimetry/differential thermal analysis (TG-DTA), UV spectra, and IR spectra. Spectrometric titrations, ethidium bromide displacement experiments, and viscosity measurements indicate that the two compounds, especially the La(III) complex, strongly bind with calf-thymus DNA, presumably via an intercalation mechanism. The intrinsic binding constants of the La(III) complex and ligand with DNA were 1.83 x 10(7) and 9.46 x 10(5) M(-1), respectively. Comparative cytotoxic activities of the La(III) complex and ligand were also determined by MTT [3-(4,5-dimethyl-2-thiazoyl)-2,5-diphenyl-2H-tetrazolium bromide] and SRB (sulforhodamine B) methods. The results showed that the La(III) complex had significant cytotoxic activity against the tested cells.
authors.affiliation: College of Chemistry and Chemical Engineering and State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China.
authors.forename: Bao-dui
authors.initials: BD
authors.lastname: Wang
authors.forename: Zheng-Yin
authors.initials: ZY
authors.lastname: Yang
authors.forename: Qin
authors.initials: Q
authors.lastname: Wang
authors.forename: Ti-Kuan
authors.initials: TK
authors.lastname: Cai
authors.forename: Patrick
authors.initials: P
authors.lastname: Crewdson
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis; D045744:Cell Line, Tumor; D002478:Cells, Cultured; D004247:DNA / Q000378:metabolism*; D004354:Drug Screening Assays, Antitumor; D044950:Flavanones / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D007811:Lanthanum / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D015394:Molecular Structure; D012545:Schiff Bases / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D044950:Flavanones; D012545:Schiff Bases; D007811:Lanthanum; D004247:DNA; C005273:naringenin