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Comparative study of calix-6-arene and 2-hydroxy propyl â-cyclodextrin as ionophores in potentiometric ion-selective electrodes for determination of gallic acid in Acacia arabica bark extract

Maha F.Abdel Ghany, Lobna A.Hussein, Hend Z.Yamani

The present work evaluates the influence of Calix-6-arene and 2-hydroxy propyl â-cyclodextrin as ionophores on the fabrication of gallic acid selective electrodes 1 and 2, respectively. The proposed sensors showedNernstian slopes of 57.70 and 55.30 mV/concentration decades over concentration range 10-3 – 10-5 M for sensors 1 and 2, respectively. Fast response and moderate stability time were observed. The selectivity coefficients of the developed sensors indicated excellent selectivity for gallic acid. The proposed electrodes were successfully applied for direct determination of gallic acid in pure form and Acacia arabica bark extract without prior separation or pretreatment steps. Thus, they can be used in quality control labs for routine analysis of gallic acid in Acacia arabica bark extract.