食品科学 ›› 2007, Vol. 28 ›› Issue (12): 316-319.

• 生物工程 • 上一篇    下一篇

牛乳温度-时间-容许期(TTT)曲线的实验确定

 谷雪莲, 刘彦臣, 刘宝林, 华泽钊, 王欣   

  1. 上海理工大学食品与生物技术研究所; 东北电力大学自动化学院; 上海理工大学食品与生物技术研究所 上海200093; 吉林吉林132012; 上海200093;
  • 出版日期:2007-12-15 发布日期:2011-11-22

Experimental Definition on TTT of Cap-packaged Dmilk

 GU  Xue-Lian, LIU  Yan-Chen, LIU  Bao-Lin, HUA  Ze-Zhao, WANG  Xin   

  1. 1.Institute of Food and Biological Technology, Shanghai University of Science and Technology, Shanghai 200093, China; 2.School of Automation Engineering, Northeast Dianli University, Jilin 132012, China
  • Online:2007-12-15 Published:2011-11-22

摘要: 为了获得精确的杯装牛乳的时间-温度-容许期(TTT)曲线,本实验研究了牛乳在4、10、15、20、25℃恒温过程中品质变化,并选择了新鲜度和菌落总数两个参数作判断依据,结合标准的要求、实验数据和线性插值的方法确定了杯装牛乳的TTT曲线。同时用Gompertz方程描述细菌生长情况。研究结果表明,Gompertz方程对菌落总数的拟合效果较好。在4、10、15、20、25℃下,菌落总数超过30000个/ml的大约时间分别为5、4.5、4、3、1d,新鲜度分别在5、4.5、4.5、3、1d内超过20°T。TTT曲线符合电子式时间温度指示器的运行要求。

关键词: TTT曲线, 时间-温度指示器, 货架期, 牛乳

Abstract: This work mainly aimed at obtaining the curve of TTT. The change of milk quality was investigated at isothermal conditions. The curve of TTT was obtained by biochemical analysis and linear interpolation. The bacteria growth of milk was described by Gompertz equation. The results showed that the TBC was fitted better by Gompertz equation. When milk was storedat 4 ℃, 10 ℃, 15 ℃, 20 ℃ and 25 ℃, TBC has been beyond 30000 counts/ml in five days, four and a half days, four days, three days and one day while acidity has been beyond 20°T in five days, four and a half days, four and a half days, three days, and one day, respectively. The curve was met to use ETTI better.

Key words: curve of TTT, time-temperature indicator, shelf life, milk