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Determination of the oestrogenic (uterotrophic) activity of extracts of 'General Purpose Polystyrene (GPPS)' using immature female rats

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Author: Prinsen, M.K. · Gouko, N.
Type:article
Date:2001
Institution: Instituut CIVO-Toxicologie en Voeding TNO
Source:Journal of Applied Toxicology, 3, 21, 235-239
Identifier: 57082
doi: doi:10.1002/jat.749
Keywords: Nutrition · Administration, Oral · Animals · Dose-Response Relationship, Drug · Estrogens · Female · Food Contamination · Humans · Hypertrophy · Polystyrenes · Public Health · Rats · Rats, Wistar · Uterus

Abstract

In Japan there is growing concern about the possible adverse effects of consumption of food from styrene containers (mainly those made from polystyrene paper) due to the alleged oestrogenic activity of styrene oligomers (dimers and trimers), which may migrate into the food. To examine the possible oestrogenic activity of styrene dimers and trimers, extracts were made from 'general purpose polystyrene (GPPS)' and administered orally to immature female rats over a 4 day period. Increase of uterus weight (wet and blotted) was used for assessment of possible oestrogenic activity. To establish the sensitivity of the test method, immature rats were treated with diethylstilboestrol (DES), a well-known oestrogenic compound. It was found that treatment of rats with levels of up to 60 μg of styrene dimers and 930 μg of styrene trimers per kilogram body weight per day did not give any statistically significant increase of the uterus weight (wet or blotted), whereas DES caused statistically significant, dose-related increases in uterus weight at levels as low as 0.89 μg kg-1 body weight day-1. It was concluded that, compared with the estimated maximum human daily intake of styrene trimers of 1 μg kg-1 body weight day-1 from polystyrene food containers, the risk of adverse human health effects with respect to oestrogenicity may be considered negligible. Copyright © 2001 John Wiley & Sons, Ltd. Chemicals/CAS: Estrogens; Polystyrenes