Citation: Zuo Peng Du, Quan Ling Suo, Xiao Yan Zhang, Ling Wei Zhang, Xiong Hui Wei. Spectral studies of the interaction between sanguinarine and guanosine[J]. Chinese Chemical Letters, ;2008, 19(12): 1465-1469. doi: 10.1016/j.cclet.2008.09.039 shu

Spectral studies of the interaction between sanguinarine and guanosine

a Chemical Engineering College, Inner Mongolia University of Technology, Hohhot 010051, China;
b Department of Applied Chemistry, Peking University, Beijing 100190, China;
c Beijing Boyuan-Hengsheng High-Technology Co. Ltd., Beijing 100190, China

Received Date: 16 April 2008

The interaction between sanguinarine and guanosine was investigated by using UV-vis and fluorescence spectra at pH 7.2. The binding of sanguinarine to guanosine was substantiated by the hypochromism and bathochromism in the absorption spectra and the emission quenching in fluorescence spectra. The fluorescence lifetime results, the varieties of the fluorophore absorption spectra and the decrease of the binding constant with the increasing temperature all indicate that the fluorescence quenching is static. The ratio and constant of the binding cytidine to sanguinarine are 2 and 6.44×10⁷, respectively. The result shows that the binding of sanguinarine to guanosine is not only exothermic but also entropy-driven with △H=-8.53 kJ/mol, △S=0.12 kJ/(mol K), and △G=-44.57 kJ/mol at 298.15 K.
- Sanguinarine,
- Guanosine,
- Spectroscopy,
- Interaction
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