Spectrometric and chromatographic identification
and characterization of dyes
contained in plastics packaging food
M. Cherif Lahimer1, M. Rafrafi Derouiche1, S. Belgaied2, J. Horriche2,
1 00UR1201 Research Unit of Industrial Organic Chemistry; National Institute of Applied Sciences and Technology
2 B.P 676 -1080
* Corresponding author. E-mail: email@example.com
Received: 17 November 2012; revised version accepted: 02 April 2013
Three commercial dyes and thirteen colored plastics extracts have been identified by GC/MS. It corresponds to Anthraquinone, Thioxanthene, Quinoline, Perinone, Piperazine, Benzimidazole, Thiazine, Aniline and Pyrozole compounds.
The FTIR technique has revealed the structures of three commercial dyes: the blue one is phthalocyanine, the red one is an azo group combined with a ß-Naphthol diazotized and the orange one is a dia azo pyrazolone.
According to ICP-AES analysis, dyes extracted from plastic packaging have no heavy metals in their composition. Migration tests simulants have in general very low levels of heavy metals in comparison with the migration limit allowed. However the Cadmium level in a soft drink green bottle simulant is very high.
Keywords: Dyes; Fourier Transform Infrared Spectrometry; UV-Visible Spectrometry; Gas Chromatography Mass Spectrometry; Emission Spectrometry; Soxhlet extraction.