EFSA Issues Opinion on Resorcinol

PARMA, ItalyThe European Food Safety Authority (EFSA), the Scientific Panel on Food Additives and Nutrient Sources added to Food (ANS) issued a scientific opinion on the safety of resorcinol when used as an antioxidant in crustaceans. Resorcinol is a specific inhibitor of polyphenol oxidase that can act as an anti-browning agent in fresh, frozen and deep-frozen crustaceans.

Resorcinol is rapidly absorbed from the gastrointestinal tract, metabolized extensively to sulphate and/or glucuronic acid conjugates and excreted primarily in the urine. Resorcinol causes moderate acute toxicity in rats. Subchronic toxicity studies in rats and mice indicate a steep dose-response curve for lethality. Carcinogenicity studies in rats and mice demonstrated the lack of carcinogenic activity of resorcinol. However, clinical signs of toxicity were seen at approximately 100 mg resorcinol/kg bw/day (five days per week) and above.

Based on the available data from in vitro and in vivo genotoxicity tests the Panel concluded that there is no concern with respect to genotoxicity. Resorcinol has no adverse effects on the developing fetus nor does it cause maternal toxicity in rats and rabbits. The Panel considers the acute neurological signs of toxicity to be the pivotal adverse effect of resorcinol and based on the NOAEL of 36 mg resorcinol/kg bw/day in the carcinogenicity study in rats and using an uncertainty factor of 300 the Panel established an ADI of 0.12 mg/kg bw/day for resorcinol.

The conservative estimates of acute consumption of shrimps (the only category for which experimental data were reported) indicate that dietary exposure to resorcinol for adults and for children would exceed the ADI when the residual concentration of resorcinol in whole raw shrimps is above 35 mg/kg. The Panel notes that this value is only applicable if other uses of resorcinol are excluded.