Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1231973 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2011 | 7 Pages |
Abstract
The interaction between Nd(III) and Calf Thymus DNA (CT-DNA) in physiological buffer (pH 7.4) has been studied using absorption spectroscopy involving 4f-4f transition spectra in different aquated organic solvents. Complexation with CT-DNA is indicated by the changes in absorption intensity following the subsequent changes in the oscillator strengths of different 4f-4f bands and Judd-Ofelt intensity (Tλ) parameters. The other spectral parameters namely Slator-Condon (Fk's), nephelauxetic effect (β), bonding (b1/2) and percent covalency (δ) parameters are computed to correlate with the binding of Nd(III) with DNA. The absorption spectra of Nd(III) exhibited hyperchromism and red shift in the presence of DNA. The binding constant, Kb has been determined by absorption measurement. The relative viscosity of DNA decreased with the addition of Nd(III). Thermodynamic parameters have been calculated according to relevant absorption data and Van't Hoff equation. The characterisation of bonding mode has been studied in detail. The results suggested that the major interaction mode between Nd(III) and DNA was external electrostatic binding.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ch. Victory Devi, N. Rajmuhon Singh,