ポリカーボネート製食器から高濃度のビスフェノールAが検出された原因の解明に関する研究

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This study investigated the cause of the illegally high levels of Bisphenol A (BPA), as established by the Food Sanitation Law, found in polycarbonate (PC) tableware for children in 1997. An analysis of the metals in the material of these articles revealed titanium and zinc at levels of 4000 to 7000 ppm. A correlation between the levels of Zn and BPA was also found. Most of the substandard articles had a label stating that they had been treated with an anti-bacterial agent-N, which contains ZnO. Therefore, we investigated the effect of the addition of metal oxides such as TiO_2, ZnO, Fe_2O_3, Al_2O_3, SiO_2 and MgO and anti-bacterial agent-N on the formation of BPA in the PC material. Pellets and test pieces were prepared by adding 0, 0.5, 1.0 and 2.0 % of these oxides and anti-bacterial agent-N under the same conditions to the PC tableware. When the test samples were prepared without the anti-oxidant, the increase in the level of BPA in the material corresponded to the amount of metal oxide that was added except for the SiO_2. ZnO was shown to have the strongest effect on the BPA formation, and when it was added to the PC resin in the ratio of 0.5%, the BPA content in the material exceeded the Food Sanitation Law level (500 ppm). Treatment with more than 1% anti-bacterial agent-N showed the same result. Test samples that were prepared by adding equal amounts of ZnO and anti-oxidant, P-EPQ, suppressed the formation of BPA, while the anti-oxidant, Irgafos-168, showed no effect. Based on these experiments, we concluded that the high level of BPA detected in the PC tableware was caused by the addition of anti-bacterial agent-N, the main component of which is ZnO, and the subsequent choice of the anti-oxidant.
日本食品化学学会の論文
2001-08-31

ポリカーボネート製食器から高濃度のビスフェノールAが検出された原因の解明に関する研究

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