Spectroscopic Studies on the Interaction between Salvianolic Acid a and Human Serum Albumin

Ting Zhang; Quan Wen Liu; Gui Hua Li

doi:10.4028/www.scientific.net/AMR.236-238.2399

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Spectroscopic Studies on the Interaction between Salvianolic Acid a and Human Serum Albumin

Abstract:

The interaction between human serum albumin (HSA) and salvianolic acid A (SA-A) was investigated by means of spectroscopy. The thermodynamic parameters ΔH and ΔS, had been calculated to be 148.94KJ·mol^-1 > 0, and 640.85 J·mol^-1·K^-1 > 0, respectively. The distance between the donor (HSA) and receptor (SA-A), r, was obtained to be 2.49nm according to Förster's non-radiative energy transfer theory. The experimental results revealed that SA-A could quench the fluorescence of HSA by a static quenching mechanism. Furthermore, the binding constants between HSA and SA-A were obviously affected by metal ions, decreased in the presence of Co(Ⅱ) and Mg(Ⅱ), increased with Ni(Ⅱ) and Zn(Ⅱ), and no change with Cu(Ⅱ). The interaction between SA-A and HSA was driven mainly by hydrophobic force.