真(zhen)空(kong)充(chong)(chong)氣(qi)(qi)(qi)(qi)(qi)包裝在(zai)真(zhen)空(kong)后(hou)再充(chong)(chong)入氮(dan)氣(qi)(qi)(qi)(qi)(qi)、二氧(yang)化碳(tan)、氧(yang)氣(qi)(qi)(qi)(qi)(qi)單一(yi)氣(qi)(qi)(qi)(qi)(qi)體(ti)(ti)或二 三種氣(qi)(qi)(qi)(qi)(qi)體(ti)(ti)的混合氣(qi)(qi)(qi)(qi)(qi)體(ti)(ti)。其(qi)氮(dan)氣(qi)(qi)(qi)(qi)(qi)是(shi)(shi)惰性氣(qi)(qi)(qi)(qi)(qi)體(ti)(ti),起(qi)充(chong)(chong)填作用,使袋內保持正(zheng)壓(ya) ,以防止(zhi)袋外(wai)空(kong)氣(qi)(qi)(qi)(qi)(qi)進(jin)入袋內,對食品起(qi)到一(yi)個保護作用。其(qi)二氧(yang)化碳(tan)能夠溶于各類(lei)脂肪(fang)或水(shui),引成酸性較弱的碳(tan)酸,有抑(yi)制霉菌、腐敗細菌等微生(sheng)物的活(huo)性。其(qi)氧(yang)氣(qi)(qi)(qi)(qi)(qi)具有抑(yi)制厭氧(yang)菌的生(sheng)長繁殖,保持水(shui)果、蔬菜的新(xin)(xin)鮮(xian)及色彩,高濃度氧(yang)氣(qi)(qi)(qi)(qi)(qi)可使新(xin)(xin)鮮(xian)肉類(lei)保持其(qi)鮮(xian)紅色。水(shui)果蔬菜的新(xin)(xin)鮮(xian)可是(shi)(shi)營(ying)養不流失。
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