真空充(chong)(chong)氣(qi)(qi)包裝在真空后再充(chong)(chong)入(ru)氮氣(qi)(qi)、二(er)(er)氧(yang)(yang)(yang)化碳、氧(yang)(yang)(yang)氣(qi)(qi)單一氣(qi)(qi)體(ti)或二(er)(er)、三(san)種氣(qi)(qi)體(ti)的(de)(de)混(hun)合氣(qi)(qi)體(ti)。其氮氣(qi)(qi)是惰性(xing)氣(qi)(qi)體(ti),起(qi)充(chong)(chong)填作用,使(shi)袋內保(bao)持正壓,以防止(zhi)袋外(wai)空氣(qi)(qi)進入(ru)袋內,對食(shi)品起(qi)到一個保(bao)護(hu)作用。其二(er)(er)氧(yang)(yang)(yang)化碳能夠(gou)溶于(yu)各類脂(zhi)肪或水(shui)(shui),引成酸(suan)性(xing)較(jiao)弱的(de)(de)碳酸(suan),有(you)抑(yi)制(zhi)霉(mei)菌、腐敗細菌等微生物的(de)(de)活性(xing)。其氧(yang)(yang)(yang)氣(qi)(qi)具有(you)抑(yi)制(zhi)厭(yan)氧(yang)(yang)(yang)菌的(de)(de)生長(chang)繁殖,保(bao)持水(shui)(shui)果、蔬(shu)菜的(de)(de)新鮮(xian)(xian)及色彩,高濃度氧(yang)(yang)(yang)氣(qi)(qi)可使(shi)新鮮(xian)(xian)肉類保(bao)持其鮮(xian)(xian)紅色。
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