真空(kong)充氣(qi)(qi)(qi)包裝在真空(kong)后再充入氮(dan)氣(qi)(qi)(qi)、二(er)氧化碳、氧氣(qi)(qi)(qi)單一(yi)氣(qi)(qi)(qi)體(ti)(ti)(ti)或二(er) 三種(zhong)氣(qi)(qi)(qi)體(ti)(ti)(ti)的混(hun)合(he)氣(qi)(qi)(qi)體(ti)(ti)(ti)。其(qi)氮(dan)氣(qi)(qi)(qi)是(shi)惰(duo)性(xing)氣(qi)(qi)(qi)體(ti)(ti)(ti),起充填作用(yong),使(shi)袋(dai)內保(bao)持(chi)正壓 ,以防止袋(dai)外(wai)空(kong)氣(qi)(qi)(qi)進入袋(dai)內,對食品(pin)起到(dao)一(yi)個保(bao)護作用(yong)。其(qi)二(er)氧化碳能夠溶于各類脂肪(fang)或水(shui),引(yin)成酸性(xing)較(jiao)弱的碳酸,有抑制霉菌、腐敗細菌等(deng)微(wei)生(sheng)物的活(huo)性(xing)。其(qi)氧氣(qi)(qi)(qi)具有抑制厭氧菌的生(sheng)長繁殖,保(bao)持(chi)水(shui)果、蔬菜(cai)的新(xin)鮮(xian)(xian)及色彩,高濃度氧氣(qi)(qi)(qi)可使(shi)新(xin)鮮(xian)(xian)肉類保(bao)持(chi)其(qi)鮮(xian)(xian)紅色。水(shui)果蔬菜(cai)的新(xin)鮮(xian)(xian)可是(shi)營(ying)養不流(liu)失。
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