Abstract
Antimicrobial Polyethylene terephthalate (PET) film was fabricated from PET waste by the process of 2° recycling, and then characterized and demonstrated at various environment conditions to evaluate its potential for for food packaging application. Blown PET film with thickness of 0.03 mm was extruded by simultaneous in situ extrusion of vPET and rPET in the ratio of 90:10. The obtained PET90:10 film was then impregnated in 3% chitosan solution under controlled pH in order to furnish a thin layer by pre-wetting phenomenon that works as a substrate for AgNPs immobilization. The immobilization of AgNPs over PET90:10 film was asserted by FESEM and EDX. Bactericidal property of film against Escherichia coli and Staphylococcus aureus are evaluated by disk diffusion assay method. Fabricated Ag-CC-PET90:10 blown film is proposed for the purpose of food packaging. The controlled migration of Ag from packaging film to food stuff is beneficial as it prevents microbial growth in packaged food stuff. The migration kinetics of Ag from Ag-CC-PET90:10 packaging film into packaged food stuff (food simulants), in terms of Ag content and the factors influencing the migration are also studied. Two food simulants; 40% EtOH and 4% HAc are used for migration study. Migration kinetics of Ag was studied for three ST; 10, 30, and 50 °C as well as for four St; 1, 24, 72 and 168 h. Results indicate that the maximum migrations of Ag in the alkaline and acidic food simulants are found to be 0.01812 and 0.07272 ppm respectively, at maximum ST and St. Migration of Ag content was found to be higher in acidic food simulant as compare to alkaline food simulant due to oxidative dissolution. The maximum Ag migrated content (50 °C, 168 h) was found under the permissible range prescribed by USFDA. The application of Ag-CC-PET90:10 blown film as food packaging material is itself an innovative and ecofriendly approach as post-consumption discarded PET waste can brought be up in utilization by means of 2° recycling.
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