Beyond BPA – Many bisphenols migrate from food packaging


In an article published on September 9, 2022, in the journal Environmental Science and Pollution, Nan Zhao and co-authors from Zhejiang University of Technology, Hangzhou, China, analyzed white foam take—out containers made of polystyrene (PS) for the presence of 20 different bisphenols and estimated exposure for the general population. They acquired 152 new containers, mainly used for fast food packaging, from restaurants located in 21 Chinese and three Canadian cities as well as in Krakow, Poland between 2018 and 2019. Zhao and colleagues performed migration experiments with food simulants (tap water, 10% and 50% ethanol, corn oil) and food (rice) by heating the samples to 100 °C and keeping them for 30 min at room temperature. They also extracted the chemicals from the containers using methanol as a solvent. Using ultra-performance liquid chromatography (UPLC) coupled with mass spectrometry, allowed the scientists to determine the quantity of the 20 target bisphenols.

Zhao et al. detected 11 bisphenols in the 126 samples collected in China, five in the 18 samples collected in Canada, and four in the six samples from Krakow. Overall of the 11 detected bisphenols, bisphenol A (BPA; CAS 80-05-7) was found most frequently, followed by bisphenol S (BPS; CAS 80-09-1) and bisphenol AF (BPAF; CAS 1478-61-1). The concentrations varied between countries; PS containers from China had the highest mean concentrations for BPA and BPS with 2694 and 5525 ng/g, respectively while the corresponding levels in Canadian samples were 81 and 45 ng/g, and in Polish samples 95 and 16 ng/g.

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Food Packaging Forum, 19.10.22