Optimisation of plasma processes for decontamination of bacterial contaminants on polymeric food packaging materials

Foodborne diseases present a global health challenge, with over 420 000 deaths annually. Packaging plays a vital role in food safety but can introduce hazards if contaminated. Traditional decontamination methods are energy-intensive or leave toxic residues. Cold plasma technology offers promising solutions for generating antimicrobial reactive species. This study optimises a plasma system for packaging decontamination, achieving high inactivation rates for Staphylococcus epidermidis (gram-positive) and Acinetobacter baumannii (gram-negative), respectively 3.5 and 4.7. Statistical analysis guide process optimisation, highlighting factors enhancing biocidal action: treatment chamber size reduction, high duty cycle, and mist injection. The system proves effective against both kinds of bacteria, with gram-negative bacteria showing higher sensitivity. The study focuses on optimising an innovative process, emphasising the process towards industrialisation and highlighting economic and environmental benefits. This investigation’s innovative approach aims to bridge the gap between laboratory prototypes and industrial applications.