摘要
为了延长冷却猪肉的货架期,以及为其气调包装组分选择提供依据,该文模拟实际生产情况,将气调保鲜冷却猪肉中优势腐败菌之一的假单胞菌接种到灭菌肉上,在(4±1)℃下,运用Logistic方程构建不同气调CO2比例下假单胞菌的生长概率模型,建立生长/不生长边界曲线,研究气调保鲜冷却猪肉中假单胞菌的生长概率。研究表明,假单胞菌在无CO2或低CO2体积分数的情况下,O2的体积分数和初期接种量的提高会使得假单胞菌生长概率变大;在高CO2体积分数情况下,假单胞菌生长概率会随之减小甚至为0,此时O2的体积分数和初期接种量对假单胞菌生长概率不构成影响。Logistic模型的拟合度较好,决定系数r2均高于0.85,实际观测值与模型预测值的决定系数R2均高于0.95,预测整体正确率为93.3%。文中定义了概率模型中模型预测的"有效-安全","有效-危险","无效-安全","无效-危险"等4种情况,进一步验证模型的有效性以及保证气调包装组分的安全选择。研究结果为气调保鲜肉制品生产中气体组分的选择提供技术依据。
In order to extend the shelf life of chilled pock and to provide reference for the choice of atmosphere package,this study simulated the real production,and established the growth probability model of Pseudomonas spp.in chilled pork with atmosphere modified packaged at（4±1）℃.Logistic model was used to establish the growth/non-growth boundary of Pseudomonas spp.in different percentage of CO2.The disinfected pock was inoculated with Pseudomonas spp.,which is one kind of specific spoilage organisms of the chilled pock.The results indicated that without CO2 or with low percentage of CO2,the growth probability of Pseudomonas spp.increased with the increase of percentage of O2 or the initial inoculation.With high percentage of CO2,the growth probability of Pseudomonas spp.was low,and not sensitive to the percentage of O2,and initial inoculation.The Logistic model performed well,which determination coefficient（r2） of the model was higher than 0.85,the determination coefficient（R2） of observed data and predicted data were all higher than 0.95,and the predicted accuracy was higher than 93.3%.Four predicted conditions of the probability model were defined as ＂effective-safe＂,＂effective-dangerous＂,＂ineffective-safe＂,＂ineffective-dangerous＂ in this paper,which were used to evaluate the validity of the model and to ensure the safe choice of the atmosphere condition.The results can provide technological references for the choice of atmosphere condition in the chilled pock production.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2012年第13期257-262,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金(30800864)
上海市自然科学基金(12ZR1420500)
关键词
包装
模型
CO2
气调
冷却猪肉
生长概率
假单胞菌
packaging, models, carbon dioxide, modified atmosphere, chilled pork, growth probability, Pseudomonas spp.
