Transfer of bisphenol A from thermal printer paper to the skin |
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Authors: | Sandra Biedermann Patrik Tschudin Koni Grob |
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Institution: | 1. Official Food Control Authority of the Canton of Zürich, P.O. Box 1471, CH-8032, Zurich, Switzerland 2. Swiss Public Radio DRS, P.O. Box 4002, Basel, Switzerland
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Abstract: | Of 13 thermal printing papers analyzed, 11 contained 8–17 g/kg bisphenol A (BPA). When taking hold of a receipt consisting
of thermal printing paper for 5 s, roughly 1 μg BPA (0.2–6 μg) was transferred to the forefinger and the middle finger if
the skin was rather dry and about ten times more if these fingers were wet or very greasy. This amount transferred to dry
skin was neither significantly increased when taking hold of the paper at up to 10 sites, nor reduced when BPA-free paper
was contacted afterwards. After 60–90 min, BPA applied to the skin as a solution in ethanol was only partially or no longer
at all extractable with ethanol, whereas BPA transferred to the skin by holding thermal printer paper remained largely extractable
after 2 h. This suggests that penetration of the skin depends on the conditions. Extractability experiments did not enable
us to conclude whether BPA passes through the skin, but indicated that it can enter the skin to such a depth that it can no
longer be washed off. If this BPA ends up in the human metabolism, exposure of a person repeatedly touching thermal printer
paper for 10 h/day, such as at a cash register, could reach 71 μg/day, which is 42 times less than the present tolerable daily
intake (TDI). However, if more than just the finger pads contact the BPA-containing paper or a hand cream enhances permeability
of the skin, this margin might be smaller. |
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