Abstract
Abstract The metal elements in polylactic acid (PLA) dinner plate were determined by inductively coupled plasma optical emission spectrometer (ICP-OES); migration of these metal elements from PLA dinner plate into 3% acetic acid food simulant at 40, 60 and 70 °C was investigated; three subsequent migration experiments under 40 °C for 10 days and 70 °C for 2 h to simulate migration under multiple-use conditions were conducted. The results revealed that the PLA dinner plate contains aluminum, barium, calcium, iron, magnesium, titanium and zinc. As expected, with the exposure time and temperature increases, the migration of metal elements increased; even after a long exposure time (40 °C for 10 days, 60 °C for 6 days, 70 °C for 6 days), the migration still continued. Migration of aluminum, barium, iron, and zinc was not exceed their specific migration limit (SML), while the estimated daily intake (EDI) of calcium and magnesium was not beyond their tolerable upper intake level (UL). The overall migration into acidic food simulant was not exceed overall migration limit (OML). For three subsequent migration experiments, the results revealed that the migration mainly occurred from the surface of PLA dinner plate when the exposure time is shorter, while the migration not only occurred from the surface but also from the interior of PLA dinner plate when the exposure time is long.
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