Preparation of antimicrobial active packaging film by capacitively coupled plasma treatment

This research is mainly focused on preparing gallic acid (GA) coated, antimicrobial, active packaging, low density polyethylene (LDPE) films by capacitively coupled plasma. Firstly, the suitable plasma treatment condition was 30 W treated for 60 s from the result of appearance and tensile strength. From the result of SEM and ATR-FTIR, the surface roughness increased which facilitated the GA coating and the surface turn smoother after GA coating. In the result of antimicrobial activity, these films is able to reduce the growth of Gram-negative bacterium Escherichia coli. and Gram-positive bacterium Staphylococcus aureus about 0.5-0.6 log CFU/mL when GA concentration is above 1%. Between these two microorganisms, the film has more significant inhibition on E. coli than S. aureus due to cell membrane structure differences. These results are first stage in developing antibacterial active packaging for foods preservation.