Assessing the impact of heavy metal residues in food and drug packaging on the standard bacterial strains: a biofilm perspective

The presence and migration of heavy metals from food and drug packaging materials into consumables pose significant health concerns. This study explored the effects of vanadium, arsenic, cadmium, and mercury contained in the digest of packaging materials on biofilms formed by standard strains of Escherichia coli ATCC 25923, Pseudomonas aeruginosa ATCC 27853, Klebsiella pneumoniae ATCC 70063, and Enterococcus faecalis ATCC 29212. Results showed that vanadium at 1.2 µg/ml promoted strong biofilm formation in all tested bacteria, while cadmium (1 µg/ml) and mercury (6.6 µg/ml) supressed biofilm formation. Arsenic at 0.6 µg/ml initially facilitated biofilm formation, but its effectiveness decreased with higher concentrations. This interference of heavy metals digests on biofilm formation in the gut microbiota is a concern, as leached heavy metals into food when consumed could disrupt the balance of human intestinal flora and homeostasis.