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T. Gajewska, A. Kaszuba

The UV spectrophotometric determination of migrated hydroquinone

Polimery 1999, No 10, 690

DOI: dx.doi.org/10.14314/polimery.1999.690


Migration of hydroquinone (1,4-hydroxybenzene) into food simulants was followed by UV spectrophotometry. In an alkaline medium, the quinone was made to react with phloroglucin in the presence of hydrogen peroxide. Absorbance of the colored product was measured at 440 nm. Hydroquinone could be determined in the presence of other dihydroxybenzenes like pirocatechol, resorcinol, and ferf-butylpirocatechol. Detectability of the method was found to be 0.3 mg hydroquinone/kg food simulant. According to the EU Directives, the specific migration limit of hydroquinone is 0.6 mg/kg. The present method was used to determine the hydroquinone that has migrated from a POLIMAL polyester resin into water, aqueous acetic acid, aqueous ethanol, and sunflower oil (Table 2) used as food simulants. 1,4-Benzoquinone, which is a product of oxidation of hydroquinone and almost always accompanies it, was found to react with phloroglucin under the conditions of the present determination.

Keywords: migration of hydroquinone, determination of hydroquinone, UV spectrophotometry

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