Differentiating response of 2,7-dichlorofluorescein intercalated CTAB modified Na-MMT clay matrix towards dopamine and ascorbic acid investigated by electronic, fluorescence spectroscopy and electrochemistry

2,7-Dichlorofluorescein incorporated cetyl-trimethyl ammonium bromide modified montmorillonite clay could distinguish dopamine (DA) and ascorbic acid (AA) by fluorescence, UV/visible spectroscopy (as aqueous dispersion) and by square wave voltammetry (as an electrode modifying agent). DA enhances the fluorescence of the modified clay while AA quenches it. The absorbance in the UV/visible spectra of the modified clay increases on interaction with DA but AA has no effect on the absorbance. As an electrode modifying agent the modified clay can separate the oxidation peaks of DA and AA by 0.170 V. (C) 2013 Elsevier B.V. All rights reserved.