title: Interaction between bisphenol A and tannic acid: spectroscopic titration approach.
abstract: The interaction between tannic acid (TA) and bisphenol A (BPA), an endocrine disruptor, was studied by absorption and fluorescence titration techniques. The binding constants and corresponding thermodynamic parameters at different temperatures (294, 296, 298, 300 and 303 K) were determined. The intrinsic fluorescence of BPA was strongly quenched by TA and the quenching mechanism is attributed to static quenching. The thermodynamic data revealed that the formation of TA-BPA complex was exothermic, entropic-driven, and spontaneous. Furthermore, hydrogen and van der Waals interactions seem to be the major driving forces for the formation of the nonfluorescent TA-BPA complex.
authors: Department of Chemistry and Biochemistry, University of Michigan-Flint, Flint, MI 48502-1950, United States. ansomo@umflint.edu
authors: Anselm
authors: A
authors: Omoike
authors: Benjamin
authors: B
authors: Brandt
mesh_terms: D001559:Benzhydryl Compounds; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry; D010636:Phenols / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013634:Tannins / Q000737:chemistry*; D013696:Temperature; D017186:Titrimetry / Q000379:methods*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D006878:Hydroxides; D010636:Phenols; D013634:Tannins; C031356:hydroxide ion; C006780:bisphenol A; D000098826:Bisphenol A Compounds