Nisin对冷鲜肉保质期的影响

[目的]考察乳酸链球菌素(Nisin)对冷鲜肉保藏过程中品质的影响。[方法]将Nisin和山梨酸钾分别置于装有200 g鲜肉的保鲜袋中,放在4℃冰箱中保藏。通过对保藏期的冷鲜肉理化指标和感官指标的评价,考察了Nisin对冷鲜肉保存过程中的汁液损失率、菌落总数、pH、挥发性盐基氮(TVB-N)、硫代巴比妥酸反应物(TBARS)和感官特性等品质指标的影响。[结果]冷鲜肉储藏过程中,加入Nisin后,可使肉体汁液流失较慢,能更有效地使肉体保鲜;可使冷鲜肉保存的时间最长,保质期可达12 d,比加入山梨酸钾的延长了2 d。感官评价表明,加入Nisin的肉体在感官上仍呈红色,肉体的弹性和组织状态都较好。[结论]Nisin对冷鲜肉延长保藏期的效果更加明显,可延长冷鲜肉的鲜度和货架期。

Effect of Nisin on Chilled Pork Preservation

[Objective]The study aimed to investigate the effect of Nisin on the quality of the chilled pork during the preservation.[Method]The Nisin and potassium sorbet were respectively put into the fresh-keeping bags with 200 g meat and preserved in the refrigerator at 4 ℃.Through the evaluation on the physical and chemical indexes and the senses index of the chilled pork in the preservation period,the effects of the Nisin on the quality parameters such as the loss rate of meat juice,total bacterial count,pH values,total volatile basic nitrogen(TVB-N),thiobarbituric acid reactive substance(TBARS) values and the sensory characteristics of the chilled pork in the preservation were investigated.[Result]During the preservation of the chilled pork,adding Nisin could make the lower loss of meat juice,thus more effectively keeping the meat freshness and could make the cold meat preserve the longest period,with the shelf life of 12 d,being extended by 2 d compared with the potassium sorbet.The sensory evaluation showed that after adding the Nisin the meat body was still red on the sensory and was better on the flexibility and organization state.[Conclusion]The Nisin could get more obvious fresh-keeping effect on the chilled meat and could prolong the freshness and shelf life of the chilled pork.