食品科学

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鲜切水芹贮藏期间微生物生长模型及货架期预测

田梦琦,杨润强,庄 言,顾振新*   

  1. 南京农业大学食品科技学院,江苏 南京 210095
  • 出版日期:2015-09-25 发布日期:2015-09-11
  • 通讯作者: 顾振新
  • 基金资助:

    “十二五”国家科技支撑计划项目(2012BAD27B03);江苏高校优势学科建设工程资助项目(PAPD)

Microbial Growth Model and Shelf-Life Prediction of Fresh-Cut Cress during Storage

TIAN Mengqi, YANG Runqiang, ZHUANG Yan , GU Zhenxin   

  1. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Online:2015-09-25 Published:2015-09-11
  • Contact: GU Zhenxin

摘要:

利用选择性培养基进行鲜切水芹贮藏期菌相分析,发现假单胞菌属是其贮藏期优势菌。保鲜袋挽口包装的鲜切水芹在22 ℃贮藏8 d,假单胞菌数量即达到106 CFU/g,低温贮藏有助于抑制假单胞菌的生长繁殖。修正的Gompertz模型能有效地拟合出4 ℃和22 ℃条件下假单胞菌属细菌的动态变化,偏差度和准确度分析表明所建立的模型是有效的。鲜切水芹于低温贮藏3 d后置于常温(22 ± 1) ℃贮藏时,叶绿素和木质素动态变化符合一级模型,在实际应用中,可根据腐败菌的生长速率来预测鲜切水芹的货架期。

关键词: 鲜切水芹, 贮藏, 微生物, 货架期

Abstract:

Pseudomonas was found to be the dominant bacteria of fresh-cut cress during storage when microflora analysis
of cress was performed using selective medium. Fresh-cut cress was packaged in sealed bags and then stored for 8 d at 22 ℃
and the number of Pseudomonas reached 106 CFU/g. The results showed that low temperature storage inhibited the growth
and reproduction of Pseudomonas. A modified Gompertz model could fit effectively the dynamic changes of Pseudomonas
count at 4 and 22 ℃. The deviation factor and accurate factor showed that the model was effective. The dynamic changes of
chlorophyll and lignin in fresh-cut cress during storage for 3 day at low temperature followed by at room temperature (22 ±
1) ℃ could be fitted to a first-order kinetic model. The shelf-life of fresh-cut cress can be predicted according to the growth
rate of spoilage bacteria in actual application.

Key words: fresh-cut cress, storage, microorganism, shelf-life

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