1、第一節(jié)第一節(jié) 柵欄技術(shù)柵欄技術(shù)第二節(jié)第二節(jié) 肉的低溫貯藏肉的低溫貯藏第三節(jié)第三節(jié) 氣調(diào)貯藏保鮮氣調(diào)貯藏保鮮第四節(jié)第四節(jié) 原料肉輻射貯藏原料肉輻射貯藏 第第二二節(jié)節(jié) 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(shí)，可以抑制微生物的生長(zhǎng)繁殖，延緩肉內(nèi)各低溫貯藏時(shí)，可以抑制微生物的生長(zhǎng)繁殖，延緩肉內(nèi)各化學(xué)成分之間的反應(yīng)，控制酶的活性。化學(xué)成分之間的反應(yīng)，控制酶的活性。 如當(dāng)溫度降到如當(dāng)溫度降到1015時(shí)，除了少數(shù)嗜冷菌外，大多時(shí)，除了少數(shù)嗜冷菌外，大多數(shù)細(xì)菌都已停止發(fā)育。原因是：在這種低溫下，肌肉中的大數(shù)細(xì)菌都已停止發(fā)育。原因是：在這種低溫下，肌肉中的大部分水分已經(jīng)

2、凍結(jié)，微生物不能通過(guò)水分獲得營(yíng)養(yǎng)來(lái)進(jìn)行正部分水分已經(jīng)凍結(jié)，微生物不能通過(guò)水分獲得營(yíng)養(yǎng)來(lái)進(jìn)行正常的生理活動(dòng)，從而阻礙了微生物的生長(zhǎng)發(fā)育。常的生理活動(dòng)，從而阻礙了微生物的生長(zhǎng)發(fā)育。 1）冰結(jié)晶最大生成帶）冰結(jié)晶最大生成帶 肉在凍結(jié)時(shí)，肉汁中的純水分形成肉在凍結(jié)時(shí)，肉汁中的純水分形成結(jié)晶，隨著水分的凍結(jié)，冰點(diǎn)下降，當(dāng)溫度降至結(jié)晶，隨著水分的凍結(jié)，冰點(diǎn)下降，當(dāng)溫度降至510時(shí)，組織中的水分大約有時(shí)，組織中的水分大約有8090%已凍結(jié)成冰。通常把這已凍結(jié)成冰。通常把這以前的溫度稱為冰結(jié)晶的最大生成帶。以前的溫度稱為冰結(jié)晶的最大生成帶。2）特點(diǎn)）特點(diǎn) 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(guò)最大冰結(jié)晶生成；通過(guò)最大冰結(jié)晶生成帶的時(shí)間也由帶的時(shí)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(lèi)種類(lèi)包裝前包裝前100%co275%o2+25%co250%o2+25%co2+25%n27 d14 d7 d15 d7 d14 d細(xì)菌總細(xì)菌總數(shù)數(shù)(個(gè)個(gè)/g)7.81022.51036.51032.61033.81077.41059.6105tvbn(mg/100g)1191013111011ph5.96.

4、16.06.56.46.46.3血紅素血紅素2584341168132145130豬肉的氣調(diào)保鮮效果豬肉的氣調(diào)保鮮效果 f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodl9i6f3b0y)v%s#pxluiqfnck8h5e2a+x*u$rznwkthp

5、emaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxltiqfnbk8h5d2a-x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owltiqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+

6、x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3b0y)v%s#pxluiqfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b0y(v%r#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&s!pymujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmuj

7、rfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfock9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!ujrfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!qynvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodl9i6f3b0y)

8、v%s#oxluiqfnck8h5d2a+x*u$rznwkshpemaj7g4c1z)w&t!pymvjrgocl9i6e3b0y(v%s#oxltiqfnbk8h5d2a-x*u$qznwkshpdmaj7f4c1z)w&s!pymujrgocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsg

9、pdlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodlai6f3b0y)v%s#pxluiqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxltiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a

10、-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowktdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rznwkthp

11、embj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$rznwkshpemaj7g4c1z)w&t!pymvjrgocl9i6e3b0y(v%r#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&s!pymujrfocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+

12、x(u%rzowkthqembj8g4d1z-w*t!qynvjock9h6e2b+y(u%rzowlthqenbj8g5d1a-w*t$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!qynvjsgodlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5d2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6e3b0y(v%s#oxltiqf

13、nbk8h5d2a-x*u$qznwkshpdmaj7f4c1z)w&s!pymujrgocl9h6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-w*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3b0y

14、)v%s#pxluiqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!pymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6+x*u$rznwkthpembj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b+y(v%r#oxltiqfnbk8g5d2a-x*u$qznvkshpdmaj7f4c0z)w&s!pymujrfoc

15、l9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qynvksgpdmai7f4c0z)v&s!pxmujrfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj8g4d1z-w*t!qynvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rznwkthpai7f3c0y)v&s#pxmuirfock9h5e2b+x(u%rzowkthqembj8g4d1z-w*t!qynvjsgodlai6f3c0y)v%s

16、#pxluirfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&t!qymvjsgodl9i6f3b0y)v%s#oxluiqfnck8h5d2a+x*u$rznwkshpemaj7g4c1z)w&t!pymvjrgocl9i6e3b0y(v%r#oxltiqfnbk8h5d2a-x*u$qznwkshpdmaj7f4c1z)w&s!pymujrgocl9h6e3b+y(v%r#owltiqenbk8g5d1a-x*t$qznvksgpdmai7f4c0z)w&s!pxmujrfocl9h6e2b+y(u%r#owlthqenbj8g5d1a-w*t$qynvksgpdl

17、ai7f3c0z)v&s#pxmuirfock9h5e2b+x(u%rzowkthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5e2a+$qynvksgpdlai7f3c0z)v&s#pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t!qynvjsgpdlai6f3c0y)v&s#pxluirfnck9h5e2a+x(u$rzowkthpembj7g4d1z-w&t!qymvjsgodlai6f3b0y)v%s#pxluiqfnck8h5e2a+x*u$rznwkthpemaj7g4c1z-w&t!p

18、ymvjrgodl9i6e3b0y(v%s#oxltiqfnbk8h5d2a+x*u$qznwkshpemaj7f4c1z)w&t!pymujrgocl9i6e3b+y(v%r#oxltiqenbk8g5d2a-x*t$qznvkshpdmai7f4c0z)w&s!pymujrfocl9h6e3b+y(u%r#owltiqenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+x(u%rzowlthqembj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuenbj8g5d1a-x*t$qynvksgpdmai7f3c0z)v&s!pxmuirfock9h6e2b+y(u%rzowlthqenbj8g4d1a-w*t$qynvjsgpdlai7f3c0y)v&s#pxmuirfnck9h5e2b+x(u$rzowkthqembj7g4d1z-w*t!qymvjsgodlai6f3c0y)v%s#pxluirfnck8h5e2a+x(u$rznwkthpembj7g4c1z-w&t!qymvjrgodl9i6f3b0y(v%s#oxluiqfnbk8h5d2a+x*u$rznwkshpemaj7g4c1z)w&t!pymvjrgo