Voltammetric determination of food colorants using a polyallylamine modified tubular electrode in a multicommutated flow system

• Type: Article in International Scientific Journal
• Date: 2007

Authors

M. Luísa S. Silva (Author) FFUP; M. Beatriz Q. Garcia (Author) FFUP; José L.F.C. Lima (Author) FFUP; E. Barrado (Author) Other

Journal

Title: Talanta

Vol. 72 No. 1

Pages: 282-288

ISSN: 0039-9140

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 69 Citations

ISI Web of Science

Scopus - 81 Citations

Scientific classification

FOS: Medical and Health sciences > Other medical sciences

CORDIS: Health sciences

Other information

Authenticus ID: P-004-AMM

Resumo (PT): This work describes the construction of a polyallylamine modified tubular glassy carbon electrode and its application in the electroreduction of food azo colorants (tartrazine, sunset yellow and allura red) by square wave voltammetry. The electrode modification prevented the surface fouling and, simultaneously, enhanced the analytical signal intensity. The developed unit was coupled to a multicommutated flow system which, given the complexity of samples, was designed to allow the implementation of the standard additions method in an automatic way, using only one standard solution. The described method presented a linear range up to about 2.0 × 10−4 mol l−1 for the referred colorants, with a detection limit of 1.8 × 10−6 mol l−1 for tartrazine, 3.5 × 10−6 mol l−1 for sunset yellow and 1.4 × 10−6 mol l−1 for allura red. The method was applied in the analysis of these colorants in several food samples, and no statistically significant difference between the results obtained by the proposed and the comparative method (HPLC) was found, at a 95% confidence level. Repeatability in the analysis of samples (expressed in R.S.D.) was about 3% (n = 10). <br> <br> Keywords: Modified tubular electrode; Voltammetry; Multicommutation; Polyallylamine; Tartrazine; Sunset yellow; Allura red; Food colorants <br> <a target="_blank" href="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6THP-4MFJT67-1&_user=2460038&_coverDate=04%2F15%2F2007&_rdoc=41&_fmt=high&_orig=browse&_srch=doc-info(%23toc%235288%232007%23999279998%23647127%23FLA%23display%23Volume)&_cdi=5288&_sort=d&_docanchor=&_ct=47&_acct=C000057398&_version=1&_urlVersion=0&_userid=2460038&md5=5539de633ac054629296b28a89543a8c"> Texto integral</a> <br> <br>

Abstract (EN): This work describes the construction of a polyallylamine modified tubular glassy carbon electrode and its application in the electroreduction of food azo colorants (tartrazine, sunset yellow and allura red) by square wave voltammetry. The electrode modification prevented the surface fouling and, simultaneously, enhanced the analytical signal intensity. The developed unit was coupled to a multicommutated flow system which, given the complexity of samples, was designed to allow the implementation of the standard additions method in an automatic way, using only one standard solution. The described method presented a linear range up to about 2.0 × 10−4 mol l−1 for the referred colorants, with a detection limit of 1.8 × 10−6 mol l−1 for tartrazine, 3.5 × 10−6 mol l−1 for sunset yellow and 1.4 × 10−6 mol l−1 for allura red. The method was applied in the analysis of these colorants in several food samples, and no statistically significant difference between the results obtained by the proposed and the comparative method (HPLC) was found, at a 95% confidence level. Repeatability in the analysis of samples (expressed in R.S.D.) was about 3% (n = 10). <br> <br> Keywords: Modified tubular electrode; Voltammetry; Multicommutation; Polyallylamine; Tartrazine; Sunset yellow; Allura red; Food colorants <br> <a target="_blank" href="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6THP-4MFJT67-1&_user=2460038&_coverDate=04%2F15%2F2007&_rdoc=41&_fmt=high&_orig=browse&_srch=doc-info(%23toc%235288%232007%23999279998%23647127%23FLA%23display%23Volume)&_cdi=5288&_sort=d&_docanchor=&_ct=47&_acct=C000057398&_version=1&_urlVersion=0&_userid=2460038&md5=5539de633ac054629296b28a89543a8c"> Full text</a> <br> <br>

Language: Portuguese

Type (Professor's evaluation): Scientific