Assay of Sudan I contamination of foodstuff by atmospheric pressure chemical ionization tandem mass spectrometry and isotope dilution |
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Authors: | Di Donna Leonardo Maiuolo Loredana Mazzotti Fabio De Luca Damiano Sindona Giovanni |
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Affiliation: | Dipartimento di Chimica, Università della Calabria, via P. Bucci, cubo 12/C, I-87030 Arcavacata di Rende (CS), Italy. |
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Abstract: | Food safety represents one of the main issues of national and international agencies appointed to health control. In April 2003, a French agency disclosed that powdered or smashed hot chili pepper imported from India and Pakistan was heavily contaminated with a carcinogenic azo dye known as Sudan I. This paper deals with a modern approach for assaying the content of this colorant in foodstuff down to a limit of a few tens of parts per billion. The isotope dilution method combined with APCI tandem mass spectrometry was used. The internal standard, 1-(d5-phenylazo)-2-naphthalenol, was obtained by simple chemistry, and its structure was determined by 1H NMR spectroscopy. The mass spectrometric method is more sensitive than the HPLC approach by a factor of 20. |
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