Published in Applied Research
Antimicrobial effectiveness of beverage containers made of silver doped PET

 

Active packaging based on a release of silver ions (Ag+) has become a focus of increasing interest. However, applications are rare for beverages in particular, and the question remains whether the amount for antimicrobial effectiveness is below the migration limit of 0.05 mg Ag/kg food proposed by the EFSA. 

The experiments, published on Journal of Food Engineering were performed using E. coli (106 cfu/mL) in distilled water and Z. bailii (<10 cfu/mL) in iced tea by directly adding AgNO3at concentrations of 0.015 and 0.05 mg/L Ag, and by using manufactured PET bottles containing silver phosphate glass enabling these concentrations to be reached by a release of Ag+ into the medium. The results showed that these Ag concentrations can inhibit bacteria in distilled water, as well as in iced tea. Ag concentrations of 0.05 mg/L reduced E. coli in distilled water by 105 cfu/mL and 0.015 mg/L by 102 cfu/mL. Z. bailiipopulation was significantly reduced by 0.05 mg/L Ag, but cells started to grow again.

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