真空(kong)(kong)充(chong)(chong)氣(qi)包裝(zhuang)在(zai)真空(kong)(kong)后再充(chong)(chong)入(ru)氮氣(qi)、二氧(yang)(yang)(yang)化碳、氧(yang)(yang)(yang)氣(qi)單一(yi)氣(qi)體(ti)或(huo)二 三種(zhong)氣(qi)體(ti)的混(hun)合氣(qi)體(ti)。其(qi)氮氣(qi)是(shi)惰性氣(qi)體(ti),起充(chong)(chong)填作(zuo)用,使(shi)袋(dai)內保持(chi)正壓 ,以(yi)防止袋(dai)外空(kong)(kong)氣(qi)進入(ru)袋(dai)內,對食品起到一(yi)個保護作(zuo)用。其(qi)二氧(yang)(yang)(yang)化碳能夠溶于各類脂肪或(huo)水,引成酸性較弱的碳酸,有(you)抑制(zhi)(zhi)霉菌(jun)、腐敗細菌(jun)等微(wei)生物的活性。其(qi)氧(yang)(yang)(yang)氣(qi)具有(you)抑制(zhi)(zhi)厭氧(yang)(yang)(yang)菌(jun)的生長繁(fan)殖,保持(chi)水果、蔬菜的新(xin)鮮(xian)及色(se)彩,高濃度氧(yang)(yang)(yang)氣(qi)可使(shi)新(xin)鮮(xian)肉類保持(chi)其(qi)鮮(xian)紅色(se)。水果蔬菜的新(xin)鮮(xian)可是(shi)營養不流失。
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