Unveiling Human Exposure to Plasticizers through Drinking Tea: A Nationwide Study

Area of Science:

• Environmental Chemistry
• Food Safety
• Toxicology

Background:

• Dietary intake is a major exposure route for phthalates (PAEs) and nonphthalate plasticizers (NPPs).
• The risk of exposure to these plasticizers through tea consumption is not well understood.
• Plasticizers are widely used in packaging and can migrate into food products.

Purpose of the Study:

• To quantify PAEs and NPPs in various Chinese teas.
• To identify sources of plasticizer contamination in tea.
• To assess human exposure risks associated with different tea brewing methods.

Main Methods:

• Analysis of 10 PAEs and 10 NPPs in six tea types from 18 Chinese provinces.
• Source apportionment analysis linking plasticizer levels to packaging materials.
• Suspect screening for plasticizer transformation products (TPs) in brewed tea.
• Comparison of plasticizer exposure from cold versus hot brewing over time.

Main Results:

• PAEs and NPPs were detected in all tea samples, with concentrations varying significantly.
• Packaging materials were identified as a key source of plasticizer contamination.
• Specific plasticizers (DiBP, BzBP, TOTM) showed strong correlations with packaging.
• Five plasticizer TPs were found in brewed tea, indicating potential health concerns.
• Cold brewing initially yielded higher exposure, but prolonged hot brewing increased risk.

Conclusions:

• Chinese tea is a significant source of dietary exposure to PAEs and NPPs.
• Packaging materials are a critical contamination source requiring attention.
• Understanding brewing practices is crucial for managing human exposure to plasticizers and their TPs.