Detection of Food Additives by Voltammetry at the Liquid−Liquid Interface

Abstract

Electrochemistry at the liquid-liquid interface enables the detection of nonredoxactive species with electroanalytical techniques. In this work, the electrochemical behavior of two food additives, aspartame and acesulfame K, was investigated. Both ions were found to undergo ion-transfer voltammetry at the liquid-liquid interface. Differential pulse voltammetry was used for the preparation of calibration curves over the concentration range of 30-350 microM with a detection limit of 30 microM. The standard addition method was applied to the determination of their concentrations in food and beverage samples such as sweeteners and sugar-free beverages. Selective electrochemically modulated liquid-liquid extraction of these species in both laboratory solutions and in beverage samples was also demonstrated. These results indicate the suitability of liquid-liquid electrochemistry as an analytical approach in food analysis.

Flow-injection amperometry at microfabricated silicon-based μ-liquid–liquid interface arrays

“…Inducing the transfer of ions across the interface between two immiscible electrolyte solutions (ITIES) by generating a potential difference between the two phases provides a powerful avenue for the detection of non-redox active species [1][2][3][4][5][6][7][8][9][10][11]. Flow injection analysis (FIA) of numerous charged species using a variety of electrochemical detection techniques (e.g.…”

An Electrochemical Approach to Quantitative Analysis of Herbicides and to the Study of Their Interactions with Soils Components

“…The lower concentration value, in this case, corresponds to an aqueous PROM solution 1.0x10 -8 M. It is worthwhile to discuss the practical aspect of the procedure here proposed. In this sense, the extraction and pre-concentration methods developed by other authors (Herzog et al, 2008;Berduque & Arrigan, 2006;Berduque et al, 2005;Collins et al, 2008;Kim & Amemiya, 2008) have several practical advantages over the present procedure, as the use of low organic phase volume, among others. Nevertheless, the results obtained in this study justify evaluating the possibility of carrying out PROM pre-concentration following the thin film approach (Kim & Amemiya, 2008) or the electrochemistry modulated liquid -liquid extraction procedure (Berduque & Arrigan, 2006;Berduque et al, 2005;Collins et al, 2008;Kim & Amemiya, 2008).…”

Simple Ion Transfer at Liquid|Liquid Interfaces

“…These interfaces can be used for understanding and developing practical electroanalytical processes and devices [9,32,36,563,564]. The electrochemical methods applied to liquid|liquid interfaces have proved a useful tool for the determination of ionic analytes not easily oxidized or reduced [36,45,119,121,136,141,149,153,254,273,336,496,562,[564][565][566][567][568][569][570][571][572][573][574][575][576][577][578][579][580].…”