Characterisation of α-tocopherol extraction into a selected carbon paste binder

Abstract

An extraction of α-tocopherol from different water-ethanolic mixtures into a commonly used paste binder was studied by ultraviolet spectrometry and anodic square wave voltammetry. It has been observed that distribution of the α-tocopherol between two immiscible phases is controlled by equilibrium constant that is significantly affected by the amount of organic solvent present in the aqueous phase. Moreover, it is evident that extraction of some biologically active compounds into the carbon paste could be used as the accumulation step within the extractive stripping voltammetric procedure to improve the sensitivity of their appropriate electroanalytical determination.