Development of a cap liner composite film incorporating zinc oxide, celite, and zeolite for kimchi-storing bottles to absorb volatile sulfur compounds

Abstract

Bottle cap liner films (“ZnO[celite]–zeolite film”) that absorb volatile sulfur compounds from kimchi were developed for kimchi-packaging plastic bottles using zinc oxide (ZnO) in celite (ZnO[celite]), zeolite, and low-density polyethylene (LDPE). The ZnO[celite] concentration-dependent deodorizing effect of the films and their physicochemical properties were evaluated. When the ZnO[celite] and zeolite mixture concentration in the film was 18% (w/w), the concentration of allyl methyl disulfide absorbed in the film increased by 98% compared with when this mixture was not used. Addition of ZnO[celite] and zeolite into the LDPE films altered their surface and cross-sectional morphologies and yellowness, but did not change their thermal stability, thermal properties, oxygen barrier, or tensile properties. These results suggest that the bottle cap liner prepared using the ZnO[celite]–zeolite film can effectively absorb volatile sulfur compounds and may be used as a liner for kimchi-containing bottles, replacing the conventional LDPE liner.