Antimony in Polyethylene Terephthalate-Bottled Beverages: The Migration Puzzle

Area of Science:

• Food safety
• Analytical chemistry
• Materials science

Background:

• Antimony (Sb) is a potential contaminant migrating from Polyethylene terephthalate (PET) packaging into food and beverages.
• Regulatory limits for Sb migration exist in regions like the EU and USA.
• Understanding factors influencing Sb migration is crucial for consumer safety.

Purpose of the Study:

• To develop a strategy for assessing variables affecting antimony migration from PET bottles into beverages.
• To investigate the impact of temperature, storage time, beverage matrix, and PET type on Sb migration.
• To provide data for future legislation on food packaging contaminants.

Main Methods:

• Optimization of a liquid chromatography-inductively coupled plasma-mass spectrometry (LC-ICP-MS) method for Sb species identification using high-resolution mass spectrometry (HRMS).
• Migration studies involving PET bottled peach and pineapple juices stored at elevated temperatures (up to 30 days).
• Comparative analysis of Sb migration in different PET containers with mineral water and juice matrices at high temperatures (up to 60 °C).

Main Results:

• Elevated storage temperatures significantly increase antimony migration into juices, potentially exceeding regulatory limits.
• Sb migration behavior differs between mineral water and juice matrices.
• Both the beverage matrix composition and the type of PET container play a critical role in antimony leaching.

Conclusions:

• Antimony migration from PET bottles is influenced by a combination of beverage matrix characteristics and PET material.
• Storing beverages in PET bottles at high temperatures poses a risk of exceeding antimony migration limits.
• This research underscores the need for comprehensive migration assessments considering multiple variables for effective food safety regulations.