不同存放条件的保鲜膜预防冰箱冷藏食物细菌污染的效果比较

目的 研究不同存放条件下的保鲜膜对预防冰箱冷藏食物细菌污染的效果。方法 取9个培养基平板, 分成3组, 每组敞口、覆盖盒装保鲜膜、覆盖非盒装保鲜膜各1个, 放置在冰箱冷藏室, 3组分别在24、48、72 h后取出, 进行细菌培养计数。同时对2种保鲜膜表面细菌培养计数。所有实验进行3次, 计算平均值。结果 2种保鲜膜表面采样后均有细菌生长, 但培养菌落数无显著性差异(P>0.05); 敞口培养基平板均有细菌生长, 与其他培养基平板有显著性差异(P<0.05); 2种保鲜膜覆盖下的培养基平板细菌培养计数均为0, 无显著性差异(P>0.05)。在冰箱不同位置放置的敞口培养基平板表面生长的菌落数无显著性差异(P>0.05)。结论 冰箱冷藏条件下, 不同存放条件的保鲜膜均可达到预防食物空气污染效果。

Comparison of the effect of preservative films with different storage conditions preventing bacterial contamination of refrigerator food

Objective To study the effect of different preservative films with different storage conditions for preventing bacterial contamination of refrigerator food. Methods Nine plates of culture media were taken and divided into 3 groups, 1 for each group with exposure, covering box plastic wrap and covering non-box plastic wrap. The 3 groups were removed from the refrigerator room after 24, 48 and 72 hours for bacterial culture count. The bacteria on the surface of 2 kinds of plastic wrap were cultured and counted at the same time. All experiments were conducted 3 times and the average value was calculated. Results There were bacterial growth after sampling on the surface of the two kinds of plastic wrap, but there was no significant difference in the number of cultured colonies (P>0.05). There was bacterial growth in the open medium plate, which was significantly different from other medium plates (P<0.05). The culture medium counts of the 2 culture plates covered with plastic wrap were 0, no significant difference (P>0.05). There was no significant difference in the number of colonies growing on the open medium plate placed in different positions of the refrigerator (P>0.05). Conclusion In the refrigerator, the preservative film with different storage conditions can achieve the effect of preventing food air pollution.