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Fluorescence quenching of bovine serum albumin by NNMB.


Spectrochim Acta A Mol Biomol Spectrosc. 2013 Feb 15;108C:146-150


Authors: Jayabharathi J, Jayamoorthy K, Thanikachalam V, Sathishkumar R


Abstract

A new type of fluorophore 2-(naphthalen-1-yl)-1-((naphthalen-1-yl)methyl)-1H-benzimidazole (NNMB) has been prepared and characterized by 1H NMR, 13C NMR, mass and IR spectral analysis. Absorption, fluorescence and synchronous fluorescence spectral studies have been made for the mutual interaction of NNMB with bovine serum albumin (BSA). Absorption spectroscopy proved the formation of a ground state BSA…NNMB complex. Fluorescence spectrum of BSA in the presence of NNMB clearly shows that NNMB acts as a quencher. Based on the theory of Forester's non-radiation energy transfer (FRET) binding distance has been deduced. The Stern-Volmer quenching constant (KSV), binding site number (n), apparent binding constant (KA) and corresponding thermodynamic parameters (ΔG, ΔH and ΔS) were determined.

PMID: 23466325 [PubMed - as supplied by publisher]