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Alexandra-Cristina Munteanu  - - - 
Top co-authors
Mihaela Badea

47 shared publications

Department of Inorganic Chemistry, Faculty of Chemistry, University of Bucharest, Bucharest, Romania

Rodica Olar

27 shared publications

Cellular Dynamics and Flow Cytometry Department, National Institute R&D for Biological Sciences, Bucharest, Romania

Valentina Uivarosi

17 shared publications

Department of General and Inorganic Chemistry, Faculty of Pharmacy, “Carol Davila” University of Medicine and Pharmacy, 6 Traian Vuia Str., 020956 Bucharest, Romania

Constantin-Daniel Negut

16 shared publications

IRASM Radiation Processing Center, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Str., P. O. Box MG-6, RO 077125 Bucharest Magurele, Ilfov, Romania, Tel.: +4021 404 2320, Fax: +4021 457 5331

Constanţa Dulea

1 shared publications

PharmaServ. International SRL, 52 Sabinelor Str., 050853 Bucharest, Romania;(L.S.);(C.D.)

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Distribution of Articles published per year 
(2016)
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Article 0 Reads 2 Citations Synthesis and Structural Investigation of New Bio-Relevant Complexes of Lanthanides with 5-Hydroxyflavone: DNA Binding a... Alexandra-Cristina Munteanu, Mihaela Badea, Rodica Olar, Lui... Published: 16 December 2016
Molecules, doi: 10.3390/molecules21121737
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
In the present work, we attempted to develop new metal coordination complexes of the natural flavonoid 5-hydroxyflavone with Sm(III), Eu(III), Gd(III), Tb(III). The resultant hydroxo complexes have been characterized by a variety of spectroscopic techniques, including fluorescence, FT-IR, UV-Vis, EPR and mass spectral studies. The general chemical formula of the complexes is [Ln(C15H9O3)3(OH)2(H2O)x]·nH2O, where Ln is the lanthanide cation and x = 0 for Sm(III), x = 1 for Eu(III), Gd(III), Tb(III) and n = 0 for Sm(III), Gd(III), Tb(III), n = 1 for Eu(III), respectively. The proposed structures of the complexes were optimized by DFT calculations. Theoretical calculations and experimental determinations sustain the proposed structures of the hydroxo complexes, with two molecules of 5-hydroxyflavone acting as monoanionic bidentate chelate ligands. The interaction of the complexes with calf thymus DNA has been explored by fluorescence titration and UV-Vis absorption binding studies, and revealed that the synthesized complexes interact with DNA with binding constants (Kb) ~ 104. Human serum albumin (HSA) and transferrin (Tf) binding studies have also been performed by fluorescence titration techniques (fluorescence quenching studies, synchronous fluorescence spectra). The apparent association constants (Ka) and thermodynamic parameters have been calculated from the fluorescence quenching experiment at 299 K, 308 K, and 318 K. The quenching curves indicate that the complexes bind to HSA with smaller affinity than the ligand, but to Tf with higher binding affinities than the ligand.
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