Adsorptive Stripping Voltammetric Determination of Tartrazine and Sunset Yellow in Gelatins and Soft Drink Powder in the presence of Cetylpyridinium Bromide

作者：Gomez Marisol^*; Arancibia Veronica; Rojas Carlos; Nagles Edgar

来源：International Journal of Electrochemical Science, 2012, 7(8): 7493-7502.

DOI：10.1016/s1452-3981(23)15799-3

• Sunset yellow
• Tartrazine
• Foods dyes
• Adsorptive stripping voltammetry
• Soft drinks
• Gelatins
• Surfactants

The use of a hanging mercury drop electrode (HMDE) to determine tartrazine and sunset yellow in gelatins and soft drink powder by adsorptive stripping voltammetry in the presence of cetylpyridiniun bromide (CPB) is reported. With an HMDE it is possible to determine individually tartrazine and sunset yellow at pH values of 8.5 and 9.8, respectively. Under these conditions tartrazine was reduced at -0.60 V and sunset yellow at -0.65 V, and the linear calibration curves ranged from 6.6-300 mu gL(-1) and 3.3-160 mu gL(-1), respectively. When CPB was added to the electrochemical cell, a tartrazine/CPB aggregate was formed, changing the reduction to 100 mV more negative potentials with a finer signal, while sunset yellow was reduced at almost the same potential (-0.55 V at pH 8.5) and the peak current decreased. Under these conditions the simultaneous determination of these dyes was possible. The limits of detection were 3.3 and 1.6 mu g L-1 for tartrazine and sunset yellow, respectively (pH 8.5, ammonium buffer, E-ads = -0.3 V and t(ads) = 30 s) and the linear range was up to 100 mu gL(-1) for both. The method was validated using undyed gelatin spiked with tartrazine and sunset yellow. Finally, the method was successfully applied to the determination of these dyes in lemon-, orange- and papaya-flavored gelatin and in a peach flavored soft drink powder.

• 出版日期2012-8