Effects of pH and ionic strength on the thermodynamics of human serum albumin-photosensitizer binding.

TitleEffects of pH and ionic strength on the thermodynamics of human serum albumin-photosensitizer binding.
Publication TypeJournal Article
Year of Publication2012
AuthorsJones CL, Dickson T, Hayes R, Thomas L
JournalThermochimica acta
Volume545
Pagination112-115
Date Published2012 Oct 10
Abstract

Fluorescence spectroscopy was used to measure the effects of pH and ionic strength on thermodynamic parameters governing the interaction of human serum albumin with zinc phthalocyanine tetrasulfonic acid. Fluorescence emission of zinc phthalocyanine increases at 686 nm with increasing concentrations of the protein. The non-linear correlation between protein concentration and emission of the photosensitizer was fitted using Chipman's analysis to calculate the binding affinities. The standard enthalpy and entropy changes were estimated from van't Hoff analysis of data that were acquired from temperature ramping studies. Results show that reaction is primarily driven by solution dynamics and that the change in enthalpy for the system becomes increasingly unfavorable with increasing pH and ionic strength. The effect of ionic strength on the entropy change for binding is shown to be significantly greater than the effects of pH. The interplay between entropy and enthalpy changes is demonstrated.

DOI10.1371/journal.pone.0074635
Alternate JournalThermochim Acta