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- W2000277584 abstract "The interaction between pyropheophorbide methyl ester (PPME) and the ionic metal of copper ( Cu 2+ ) was investigated using fluorescence and UV-vis techniques. By analysis of the fluorescence spectra, it was observed that Cu 2+ has a strong ability to quench the intrinsic fluorescence of PPME through dynamic and static quenching process. The binding constants of Cu 2+ with PPME were determined at different temperatures depending on the results of fluorescence quenching. Based on the modified form of the Stern–Volmer equation, static binding constant (k S ) and the dynamic binding constant (k D ) of Cu 2+ -PPME association were obtained at different temperatures. The static thermodynamic function of the enthalpy change (ΔH S ), the dynamic thermodynamic function of the enthalpy change (ΔH D ), the static thermodynamic function of the entropy change (ΔS S ), and the dynamic thermodynamic function of the entropy change (ΔS D ) for the binding interaction were determined according to the van't Hoff equation. The values of static Gibbs free energy change (ΔG S ) and dynamic Gibbs free energy change (ΔG D ) were determined to be negative indicating that the interaction process was a spontaneous. ΔH D and ΔS D values were positive indicating that the dynamic quenching process of Cu 2+ -PPME interaction was driven mainly by hydrophobic forces. For the static binding quenching, ΔH S and ΔS S values were negative which indicated that hydrogen bond, electrostatic interaction, and van der Waals interaction were important driving forces for PPME- Cu 2+ association. Both static and dynamic fluorescence quenching were related to the distance between PPME and Cu 2+ indicating that the electron transfer process occurred." @default.
- W2000277584 created "2016-06-24" @default.
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- W2000277584 date "2014-04-01" @default.
- W2000277584 modified "2023-09-30" @default.
- W2000277584 title "Separation of static and dynamic thermodynamic parameters for the interaction between pyropheophorbide methyl ester and copper" @default.
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- W2000277584 doi "https://doi.org/10.1142/s1088424614500023" @default.
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