预测牛乳货架期的时间-温度指示器的研制

Development of time-temperature indicator to predict shelf life of milk

利用生物化学方法实验研究了牛乳品质与存放温度、时间的关系,并根据菌落总数和酸度作为依据得出时间-温度-货架期曲线。应用单片机技术,研制出能实测和记录冷藏链时间-温度变化和剩余货架期的指示器。以期实现冷藏链中牛乳的品质监测。研究结果表明,存放过程中,菌落总数随着温度的升高和时间的延长而增加,新鲜度随温度的升高和时间的延长而降低。对于经历了不同温度-时间存放的牛乳,应用指示器实测的剩余货架期和生物化学实验得到的结果相比,偏差在0.5 d以内。当牛乳剩余货架期少于1 d时,指示器发出声音报警。

This work focused on the quality of milk in cold chain. The relationship between quality and storage temperature and time on milk was investigated by biochemical means. The curve of TTT （Time-Temperature-Tolerance） was obtained from biochemical results. A Time-Temperature Indicator（TTI） to predict shelf life of milk has been developed by using single chip microprocessors. The results show that the higher the storage temperature and the longer the storage period, the more TBC （total bacterial count） and the lower freshness of milk. The remaining shelf life of milk was obtained by the results between measurement and biochemical analysis is less condition that the remaining shelf life is less than 1d occurs. variational temperature test, whose difference of than 0. 5 d. The TTI will alarm when abnormal