真空(kong)(kong)(kong)充(chong)氣(qi)(qi)包(bao)裝在真空(kong)(kong)(kong)后再充(chong)入氮(dan)氣(qi)(qi)、二氧(yang)(yang)(yang)化(hua)碳、氧(yang)(yang)(yang)氣(qi)(qi)單一氣(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(dan)氣(qi)(qi)是惰性(xing)氣(qi)(qi)體(ti),起充(chong)填作用,使袋(dai)(dai)內保持正(zheng)壓(ya),以防止袋(dai)(dai)外空(kong)(kong)(kong)氣(qi)(qi)進入袋(dai)(dai)內,對(dui)食品起到一個(ge)保護作用。其(qi)(qi)二氧(yang)(yang)(yang)化(hua)碳能夠溶于(yu)各類脂(zhi)肪或水,引成酸(suan)性(xing)較弱(ruo)的碳酸(suan),有抑(yi)制霉菌(jun)、腐敗細菌(jun)等微(wei)生(sheng)物的活性(xing)。其(qi)(qi)氧(yang)(yang)(yang)氣(qi)(qi)具有抑(yi)制厭(yan)氧(yang)(yang)(yang)菌(jun)的生(sheng)長繁殖,保持水果、蔬菜的新(xin)鮮(xian)(xian)及色彩,高濃度(du)氧(yang)(yang)(yang)氣(qi)(qi)可使新(xin)鮮(xian)(xian)肉類保持其(qi)(qi)鮮(xian)(xian)紅色。
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