Bisphenol A migration from polycarbonate baby bottle with repeated use

Area of Science:

• Environmental Science
• Materials Science
• Analytical Chemistry

Background:

• Polycarbonate (PC) baby bottles are widely used for infant feeding.
• Concerns exist regarding the potential migration of chemicals like bisphenol A (BPA) from these bottles into consumed liquids.
• Understanding the factors influencing BPA migration is crucial for infant health and safety.

Purpose of the Study:

• To quantify the migration of bisphenol A (BPA) from new and used polycarbonate (PC) baby bottles into water.
• To investigate the impact of repeated use (up to 100 times) and water temperature (40°C to 100°C) on BPA migration.
• To characterize the aging process of PC baby bottles concerning BPA release.

Main Methods:

• BPA migration was quantified using Gas Chromatography-Mass Spectrometry (GC-MS) in selected ion monitoring mode.
• PC baby bottles were subjected to repeated use cycles and water extractions at various temperatures.
• The physical changes in PC bottles, specifically d-spacing, were measured using X-ray diffraction.

Main Results:

• BPA concentrations in new bottles were low (0.03-0.13 ppb) across tested temperatures.
• Bottles used for 6 months showed significantly higher BPA levels (0.18-18.47 ppb) at 40°C and 95°C.
• BPA migration increased sharply above 80°C, with aging effects observed after approximately 3 months (60 uses).
• Increased d-spacing in aged PC bottles correlated with enhanced BPA migration, from 0.499 nm (new) to 0.511 nm (6 months).

Conclusions:

• Repeated use and elevated temperatures accelerate BPA migration from PC baby bottles.
• The aging of PC material, evidenced by increased d-spacing, is a key factor in enhanced BPA release.
• These findings highlight potential risks associated with prolonged use of PC baby bottles, especially at higher temperatures.