Journal of Spectroscopy

Journal of Spectroscopy / 2011 / Article

Open Access

Volume 26 |Article ID 932060 | https://doi.org/10.3233/SPE-2011-0539

Jing Tian, Changyun Chen, Mengwei Xue, "The interaction between protocatechuic aldehyde and human serum albumin using three-dimensional fluorescence techniques", Journal of Spectroscopy, vol. 26, Article ID 932060, 7 pages, 2011. https://doi.org/10.3233/SPE-2011-0539

The interaction between protocatechuic aldehyde and human serum albumin using three-dimensional fluorescence techniques

Abstract

The binding mechanism between protocatechuic aldehyde (PA) and human serum albumin (HSA) was investigated by fluorescence spectroscopy at different temperatures. It is proved that the fluorescence quenching of HSA by PA is not results of the formation of PA–HSA complex. The equilibrium constant K and the number of binding sites n were measured at different temperature by fluorescence quenching method. The standard enthalpy change (ΔH) and the standard entropy change (ΔS) of this interaction process were calculated to be 114.02 kJ · mol−1, 541.92 J · mol−1·K−1, respectively. According to the interaction between PA and HSA of thermodynamic parameters ΔH and ΔS, the major acting force can be measured. The synchronous fluorescence spectra shows the microenvironment of tryptophan residue is changed and the hydrophobicity is increased. Through three-dimensional (3D) fluorescence spectra can get some valuable structure changing information.

Copyright © 2011 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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