Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Interaction of Bilobalide and Ginkgolides B with Bovine Serum Albumin: A Fluorescence Quenching Study

  • Chen, Yan (School of Life Science, Anhui University) ;
  • Wang, Ruijun (School of Life Science, Anhui University) ;
  • Wang, Shusheng (School of Life Science, Anhui University) ;
  • Yang, Yi (Engineering Research Center of Bio-Process, Hefei University of Technology) ;
  • Li, Shaofei (School of Life Science, Anhui University) ;
  • Kai, Guiqing (School of Life Science, Anhui University)
  • Received : 2011.01.21
  • Accepted : 2011.07.18
  • Published : 2011.09.20
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Abstract

The interaction of bilobalide (BB) and ginkgolides B (GB) with bovine serum albumin (BSA) was investigated by fluorescent technique and UV/vis absorption spectroscopy. The results showed that BB and GB could intensively quench the fluorescence of BSA through a static quenching procedure. The binding constants (Ka) and the average binding distance between the donor (BSA) and the acceptor (ginkgolides) were obtained ($r_{BB}$ = 5.33 nm and $r_{GB}$ = 4.20 nm) by the theory of non-radiation energy transfer, and then the thermodynamic parameters such as ${\Delta}S^0$ (0.17-0.32 kJ/mol), ${\Delta}G^0$ (-20.76 ~ -17.79 kJ/mol) and ${\Delta}H^0$ (32.47-76.52 kJ/mol) could be calculated, respectively. All these results revealed that the interaction of BB and GB with BSA were driven mainly by hydrophobie force. The synchronous fluorescence spectroscopy was applied to examine the effect of two ginkgolides on the configuration of BSA. The configuration alteration of BSA could be induced by the hydrophobicitv environment of tyrosine with the increase of the drug concentration.

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