真空充(chong)(chong)氣(qi)(qi)包(bao)裝在真空后再充(chong)(chong)入氮氣(qi)(qi)、二氧(yang)(yang)(yang)化碳(tan)、氧(yang)(yang)(yang)氣(qi)(qi)單一(yi)氣(qi)(qi)體(ti)或二 三種氣(qi)(qi)體(ti)的混合氣(qi)(qi)體(ti)。其(qi)(qi)氮氣(qi)(qi)是惰性氣(qi)(qi)體(ti),起充(chong)(chong)填(tian)作用(yong),使袋內(nei)(nei)保(bao)持(chi)正壓 ,以(yi)防止袋外空氣(qi)(qi)進入袋內(nei)(nei),對(dui)食品起到(dao)一(yi)個保(bao)護作用(yong)。其(qi)(qi)二氧(yang)(yang)(yang)化碳(tan)能夠(gou)溶(rong)于各(ge)類脂肪或水,引(yin)成酸(suan)(suan)性較(jiao)弱的碳(tan)酸(suan)(suan),有(you)抑制霉菌、腐敗細(xi)菌等微生物的活性。其(qi)(qi)氧(yang)(yang)(yang)氣(qi)(qi)具有(you)抑制厭氧(yang)(yang)(yang)菌的生長繁殖,保(bao)持(chi)水果、蔬菜的新鮮(xian)(xian)及色彩,高濃度氧(yang)(yang)(yang)氣(qi)(qi)可(ke)使新鮮(xian)(xian)肉(rou)類保(bao)持(chi)其(qi)(qi)鮮(xian)(xian)紅色。水果蔬菜的新鮮(xian)(xian)可(ke)是營養不流(liu)失。
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