Anti-bacterial Activity and Rice Fresh-keeping Property of Litsea cubeba Essential Oil-based Polyethylene Film

To prepare antibacterial polyethylene film and explore its performance of rice storage preservation,the bacteriostatic agents of Litsea cubeba essential oil(LCEO)and its mircocapsules were mixed into the base material of polyethylene and LCEO-based polyethylene film were prepared,respectively,by using extrusion molding and blow molding film technology. Then the mechanical properties,apparent morphology,anti-bacterial activity and its application in rice preservation on the contents of fatty acid value and the total acid were researched. The results showed that 2% LCEO-M and 2% LCEO-CM had good mechanical properties and antibacterial activity. The tensile strength of 2% LCEO-M and 2% LCEO-CM was(23.72±1.94) and(20.27±1.78) MPa,respectively,the elongation at break was(136.04%±2.59%)and(136.59%±3.26%),respectively,and the tensile elastic moduli was(107.99±2.77) MPa and(120.42±2.89) MPa,respectively. The films of 2% LCEO-M and 2% LCEO-CM had broad spectrum bacteriostatic activity,and the inhibition rates of Escherichia coli,Staphylococcus aureus,Penicillium,grey mold and Aspergillus were all greater than 50%. Under the simulated conditions of high temperature and high humidity,2% LCEO-M and 2% LCEO-CM could effectively avoid the rapid rise of fatty acid value and total acid value of rice in the early stage of rice storage(0~14 d),so as to delay the aging of rice.