Determination of Sudan I in drinks containing Sunset yellow by adsorptive stripping voltammetry.

ABSTRACT

An efficient, fast and sensitive method for the determination of Sudan I (SI) in drinks containing Sunset yellow (Sy) is developed and validated using an adsorptive stripping voltammetric procedure. Sy is currently added to a large number of foods; however during their synthesis SI may be produced. The determination is based on adsorption of Sy and SI onto HMDE and later reduction of the azo group at -0.71 and -0.82V, respectively. Using the best set of the experimental conditions (pH 12.3; Eads -0.40V) for the determination of SI in Sy, a linear response for SI in the concentration range 0.5-27.2µgL(-1) was found, with a detection limit of 1.5µgL(-1) in a tads of only 30s. The method was applied to the determination of SI in commercial drinks with satisfactory results. The presence of SI was confirmed by mass spectrometry.