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。
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 resultsshowed that the TBC was fitted better by Gompertz equation. When milk was stored at 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.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2007年第12期316-319,共4页
Food Science
