I. Development of kimchi deodorization low-density polyethylene composite film lids incorporation zinc oxide and zeolite
Lid film to be used in plastic bottles for packaging kimchi, which adsorbs volatile sulfur compounds from kimchi using synthesized zinc oxide (ZnO) in celite (ZnO/celite) and zeolite as deodorizing agents and low-density polyethylene as a base material (ZnO/celite-zeolite composite film) was developed. The quantitative analysis method of volatile sulfur compounds of the kimchi container was determined, the deodorization effect of the concentration of ZnO/celite in the composite film, and the effect of ZnO/celite on the physicochemical properties of the composite film were investigated. As for the quantitative analysis conditions of the headspace of the kimchi container, the optimal equilibrium temperature, time, and SPME adsorption time were determined to be 35 ℃, 60 minutes and 15 minutes, respectively and the quantitative analysis conditions the headspace of the vial containing the lid, the optimal equilibrium temperature, time, and SPME adsorption time were determined to be 80 ℃, 30 minutes and 20 minutes, respectively. As the concentration of ZnO/celite in the composite film increased to 7, 11, and 14%, the concentration of AMS and AMDS was not significantly different, but DADS was significantly higher at 11%. The incorporation of ZnO and zeolite did not alter the physicochemical properties of composite film significantly. The results revealed that ZnO/celite-zeolite composite film was effective to absorb the volatile sulfur containing compounds without altering their physicochemical properties.
II. Development of kimchi deodorization low-density polyethylene foam lids incorporation zinc oxide and zeolite
Foam lids for bottles were prepared by slit-die extrusion using low-density polyethylene (LDPE) incorporating zinc oxide (ZnO) and zeolite (ZnO/zeolite foam lids) to lower the release sulfur-containing volatile compounds (SVCs) from LDPE bottles containing kimchi. . The concentrations of allyl methyl sulfide, allyl methyl disulfide, and diallyl disulfide in the headspace of the bottles with the lids with and without containing hydrothermally synthesized ZnO in zeolite (ZnO/zeolite) and those absorbed in the lids with and without ZnO/zeolite were not different during storage (p > 0.05). Nonetheless, the concentrations of the SVCs released from the bottle having the lid with ZnO/zeolite were lower than those with the lid without the compounds during storage (p < 0.05). The incorporation of ZnO/zeolite did not alter the physicochemical properties of the lids. ZnO-zeolite foam lids show potential for effective mitigation of SVCs release from kimchi products during storage.
III. Development of kimchi deodorization low-density polyethylene laminated film lids and pouch incorporation zinc oxide and zeolite
Laminated films to be used in plastic bottles for packaging kimchi, which adsorbs volatile sulfur compounds from kimchi using synthesized zinc oxide (ZnO) in celite (ZnO/celite) and zeolite as deodorizing agents and low-density polyethylene as a base material (ZnO/celite-zeolite laminated film) was developed. The concentrations of allyl methyl sulfide, allyl methyl disulfide, and diallyl disulfide absorbed in the ZnO/celite-zeolite lamicated lids were hiher than LDPE film lids during storage (p < 0.05). Nonetheless, the concentrations of allyl methyl sulfide, allyl methyl disulfide, and diallyl disulfide absorbed in the ZnO/celite-zeolite pouch were higher than LDPE pouch during storage (p < 0.05). The incorporation of ZnO/celite and zeolite did not alter the physicochemical properties of the lids. ZnO/celite-zeolite laminated film show potential for effective absorption of SVCs from kimchi products during storage.