Commercially available food contact materials containing nanoparticles: Characterization and Migration

G.O. Noonan, S. Addo Ntim, L. Ali, T.H. Begley, T.V. Duncan, K. Pillai
U.S. Food and Drug Administration, US

Keywords: food contact material, nanoparticle, migration

Summary:

Characterizing the commercial products, including the physico-chemical properties and potential migration of constituents (traditional and nano-forms) is an important step in assessing the safety of FCMs. The goal of this project is to identify/develop methods for characterizing nanomaterials used in food contact applications and to evaluate the applicability of conventional migration protocols to the nano-products. With the incorporation of nanosilver into FCMs and the marketing of these products directly to the consumer it was also important to assess the efficacy of the products. The purchased products were made of polyethylene and polypropylene and all contained silver (mg/kg of polymer). Although none of the products showed a high concentration of silver migration, there was a large concentration variation both between and within products. The low levels of migration and total silver concentrations found in many of the FCMs made it unlikely that there is enough surface active silver to impart any measureable antimicrobial effect. Therefore two protocols were used to evaluate the anit-microbial properties of the FCMs.