Interaction between bisphenol A and tannic Acid: Spectroscopic titration approach

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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Interaction between tannic acid (TA) and bisphenol A (BPA) using spectroscopic (ultraviolet–visible absorption) and fluorescence titration techniques was investigated. ► TA effectively quenched BPA fluorescence intensity via static quenching mechanism. ► Formation of TA–BPA complex was exothermic, entropic-driven, spontaneous, and indicative of hydrogen bonding and van der Waals interactions. ► Important insights into interaction between two ubiquitous constituents of food and natural waters have been provided. ► TA matrix should be considered in fluorescence analysis of BPA and BPA speciation.