1、第一節第一節 柵欄技術柵欄技術第二節第二節 肉的低溫貯藏肉的低溫貯藏第三節第三節 氣調貯藏保鮮氣調貯藏保鮮第四節第四節 原料肉輻射貯藏原料肉輻射貯藏 第第二二節節 肉的低溫貯藏肉的低溫貯藏一、低溫貯藏的基本原理一、低溫貯藏的基本原理 低溫貯藏時，可以抑制微生物的生長繁殖，延緩肉內各低溫貯藏時，可以抑制微生物的生長繁殖，延緩肉內各化學成分之間的反應，控制酶的活性。化學成分之間的反應，控制酶的活性。 如當溫度降到如當溫度降到1015時，除了少數嗜冷菌外，大多時，除了少數嗜冷菌外，大多數細菌都已停止發育。原因是：在這種低溫下，肌肉中的大數細菌都已停止發育。原因是：在這種低溫下，肌肉中的大部分水分已經

2、凍結，微生物不能通過水分獲得營養來進行正部分水分已經凍結，微生物不能通過水分獲得營養來進行正常的生理活動，從而阻礙了微生物的生長發育。常的生理活動，從而阻礙了微生物的生長發育。 1）冰結晶最大生成帶）冰結晶最大生成帶 肉在凍結時，肉汁中的純水分形成肉在凍結時，肉汁中的純水分形成結晶，隨著水分的凍結，冰點下降，當溫度降至結晶，隨著水分的凍結，冰點下降，當溫度降至510時，組織中的水分大約有時，組織中的水分大約有8090%已凍結成冰。通常把這已凍結成冰。通常把這以前的溫度稱為冰結晶的最大生成帶。以前的溫度稱為冰結晶的最大生成帶。2）特點）特點 冰殼冷凍法是快速冷凍法，其冷凍溫度由冰殼冷凍法是快速冷

3、凍法，其冷凍溫度由3045，降到，降到80100；通過最大冰結晶生成；通過最大冰結晶生成帶的時間也由帶的時間也由1h縮短到縮短到30min；冰晶體大小由；冰晶體大小由100降到降到10以下。以下。3）工藝流程）工藝流程 降溫降溫 緩慢冷凍緩慢冷凍 急速冷凍急速冷凍 緩凍緩凍 貯藏貯藏 種類種類包裝前包裝前100%co275%o2+25%co250%o2+25%co2+25%n27 d14 d7 d15 d7 d14 d細菌總細菌總數數(個個/g)7.81022.51036.51032.61033.81077.41059.6105tvbn(mg/100g)1191013111011ph5.96.

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