真空(kong)充(chong)(chong)氣(qi)(qi)(qi)(qi)包裝在真空(kong)后再充(chong)(chong)入氮氣(qi)(qi)(qi)(qi)、二氧化(hua)碳、氧氣(qi)(qi)(qi)(qi)單一氣(qi)(qi)(qi)(qi)體(ti)或二 三種氣(qi)(qi)(qi)(qi)體(ti)的混合氣(qi)(qi)(qi)(qi)體(ti)。其氮氣(qi)(qi)(qi)(qi)是惰性(xing)氣(qi)(qi)(qi)(qi)體(ti),起充(chong)(chong)填作用,使袋(dai)(dai)內保(bao)(bao)(bao)持正壓 ,以防止袋(dai)(dai)外(wai)空(kong)氣(qi)(qi)(qi)(qi)進(jin)入袋(dai)(dai)內,對食品起到一個保(bao)(bao)(bao)護(hu)作用。其二氧化(hua)碳能(neng)夠溶(rong)于各類脂(zhi)肪或水(shui),引成(cheng)酸性(xing)較弱(ruo)的碳酸,有抑(yi)制(zhi)霉菌、腐敗細菌等(deng)微生物的活性(xing)。其氧氣(qi)(qi)(qi)(qi)具(ju)有抑(yi)制(zhi)厭(yan)氧菌的生長繁(fan)殖,保(bao)(bao)(bao)持水(shui)果、蔬菜(cai)的新(xin)鮮(xian)及色彩,高濃度(du)氧氣(qi)(qi)(qi)(qi)可使新(xin)鮮(xian)肉類保(bao)(bao)(bao)持其鮮(xian)紅色。水(shui)果蔬菜(cai)的新(xin)鮮(xian)可是營養不流失。
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