Determination of sulphanilic acid in the presence of tartrazine by differential-pulse polarography after conversion into an azo compound
✍ Scribed by Aquiles A. Barros; José A. Rodrigues; Paulo J. Almeida
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 357 KB
- Volume
- 273
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
The determmatlon of a hydropluhc aromatic amme, sulphamhc acid, m the presence of the water-soluble colourmg matter tartrazme was studled Previously, hydrophobic aroma& ammes were determmed m water-soluble colourmg matter usmg extractlon of the ammes mto chloroform With the hydrophtic sulphamhc acid this procedure IS not feasible and a polarographlc method was developed for the determmatlon of sulphamhc acid m the presence of tartrazme, usmg a maskmg agent, gelatm, to suppress the polarographlc peak of the colourmg matter Concentrations of sulphamhc acid as low as 0 1 mg 1-l could be determmed m solutions up to SO0 times more concentrated m tartrazme The method was apphed to measure the amount of sulphamhc acid formed m the degradation of tartrazme m 10% sodmm hydroxide solution In contrast with the results obtamed when the degradation IS carned out m ascorbic acid, virtually no sulphamhc acid was found, mdlcatmg a different process of degradation Keyworuk Polarography, Sulphamhc acid, Tartrazme