Food contact materials

Importance of the Topic

Migration from food contact materials represents a critical food safety issue: chemicals and metals can transfer into foods at levels posing health or sensory risks. Robust analytical methods are essential to monitor compliance with global regulations, protect consumers, and guide industry in material selection and packaging design.

Study Objectives and Overview

This summary reviews regulatory frameworks across the EU, USA, and Japan; explains migration mechanisms for plastics, paper, ceramics, and metals; and surveys analytical strategies—from polymer identification to non‐targeted screening—for assessing both overall and specific migration.

Methodology and Instrumentation

A multi‐technique approach is required to cover the wide chemical space of migrants:

• Polymer identification: FTIR (transmission and ATR) with spectral libraries
• Rapid additive screening: DART‐MS and DART‐Orbitrap MS
• Extraction: Accelerated Solvent Extraction (ASE), solvent extraction, saponification
• Volatile analytes: headspace GC and GC‐MS (single‐quad and Orbitrap-based)
• Semi‐volatile organics: GC‐FID, GC‐MS; LC‐MS/MS for phthalates, photo‐initiators, bisphenols
• Non‐targeted high‐resolution: LC‐Orbitrap MS and GC‐Orbitrap MS for NIAS
• Mineral hydrocarbons: two‐dimensional LC‐GC‐FID
• Elemental leaching: AAS and ICP‐MS; single‐particle ICP‐MS for nanoparticles
• Modeling: mathematical diffusion models for specific migration estimation

Main Results and Discussion

The diversity of packaging polymers (e.g., PET, PE, PP, PVC, PC, PS) and additives (plasticizers, antioxidants, UV stabilizers, epoxies) yields a range of migrants requiring tailored tests. Key findings include:

• Overall migration limits (60 mg/kg) and specific migration limits (SML) demand testing with standardized food simulants (aqueous, acidic, alcoholic, fatty, Tenax).
• Toxicologically significant migrants: vinyl chloride, acrylonitrile, bisphenol A, epoxidized soybean oil, primary aromatic amines, photoinitiators, mineral oil hydrocarbons (MOSH/MOAH).
• Regulatory alerts (RASFF) often involve melamine/formaldehyde in tableware, excessive ESBO in gaskets, and metal leaching (Cd, Pb, Cr, Ni) from ceramics and utensils.
• Non‐intentionally added substances (NIAS) and oligomers require high‐resolution MS for identification and risk assessment.

Benefits and Practical Applications

These integrated analytical protocols enable:

• Compliance verification with EU, FDA, and Japanese standards.
• Screening and quantification of hundreds of migrants spanning volatiles, organics, and metals.
• Detection of emerging contaminants and NIAS before market release.
• Rational material selection and formulation adjustments to minimize migration.

Future Trends and Applications

Emerging directions include:

• Advanced non‐targeted workflows combining HRMS and chemoinformatics for untold migrants.
• Refined migration modeling tools integrated into regulatory submissions.
• Analytical challenges posed by active/intelligent packaging and novel coatings.
• Expansion of nanoparticle safety assays with single‐particle ICP‐MS.
• Automation, miniaturization, and in‐line monitoring to accelerate compliance testing.

Conclusion

Ensuring the safety of food contact materials demands a comprehensive arsenal of analytical techniques, standardized protocols, and predictive models. Continued collaboration among reference laboratories, industry, and regulators will drive harmonized methods, address NIAS, and support innovation in sustainable and safe packaging.

Reference

Key literature includes:

• Barnes et al., Chemical Migration and Food Contact Materials, Woodhead 2007.
• Nerin et al., Anal. Chim. Acta 775 (2013): NIAS review.
• Paseiro-Cerrato et al., Food Addit. Contam. A 31 (2014): DART-MS method.
• Bignardi et al., J. Chromatogr. A 1372 (2014): LC-Orbitrap for plastics.
• Lorenzini et al., Food Addit. Contam. A 27 (2014): Mineral oils migration.