Spectrometric and chromatographic identification

and characterization of dyes

contained in plastics packaging food


M. Cherif Lahimer1, M. Rafrafi Derouiche1, S. Belgaied2, J. Horriche2, N. Ayed1*

1   00UR1201 Research Unit of Industrial Organic Chemistry; National Institute of Applied Sciences and Technology

2   B.P 676 -1080 Tunis - Tunisia.

3   Tunisian Packaging Technical Center (Packtec); Cité El Khadhra BP 64 - 1003 Tunis - Tunisia.

* Corresponding author. E-mail: nanaceurayed78@gmail.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.

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