New test measures potentially harmful metals in cellulose food packaging

A new technique for detecting potentially harmful metals in regenerated cellulose food packaging has been developed, as reported in the International Journal of Environment and Pollution. The method can measure cadmium, chromium, lead, and titanium in a single pass, identifying any metallic elements that might leach into food under certain conditions.

Tests on five commercially available packaging samples revealed that none of these elements exceeded safety thresholds, but the researchers emphasize that improved detection methods are needed to ensure routine monitoring and regulatory standards across the industry. The technique employs microwave digestion with heated acidic reagents to break down the sample, followed by inductively coupled plasma atomic emission spectrometry (ICP-AES) analysis, which heats the sample to form a high-temperature plasma and identifies metallic elements based on the characteristic light they emit.

Regenerated cellulose is increasingly used as an environmentally friendly packaging alternative, but its manufacture may involve chemical additives requiring safety assessment. This new method could help manufacturers and regulators identify potential contamination more reliably, enhancing quality control and the safety of this packaging type.