真(zhen)空(kong)充(chong)(chong)氣(qi)(qi)(qi)(qi)包裝(zhuang)在真(zhen)空(kong)后(hou)再充(chong)(chong)入氮氣(qi)(qi)(qi)(qi)、二氧(yang)(yang)化碳、氧(yang)(yang)氣(qi)(qi)(qi)(qi)單一(yi)氣(qi)(qi)(qi)(qi)體或(huo)二 三種氣(qi)(qi)(qi)(qi)體的混(hun)合氣(qi)(qi)(qi)(qi)體。其(qi)氮氣(qi)(qi)(qi)(qi)是惰性氣(qi)(qi)(qi)(qi)體,起充(chong)(chong)填作用,使袋內保(bao)持(chi)正(zheng)壓 ,以防(fang)止(zhi)袋外(wai)空(kong)氣(qi)(qi)(qi)(qi)進入袋內,對食(shi)品起到一(yi)個(ge)保(bao)護作用。其(qi)二氧(yang)(yang)化碳能夠溶于各類脂肪或(huo)水,引成酸性較弱(ruo)的碳酸,有(you)抑制霉菌、腐敗細菌等微生(sheng)物的活性。其(qi)氧(yang)(yang)氣(qi)(qi)(qi)(qi)具有(you)抑制厭氧(yang)(yang)菌的生(sheng)長(chang)繁殖,保(bao)持(chi)水果、蔬菜(cai)(cai)的新(xin)鮮及(ji)色彩(cai),高濃度(du)氧(yang)(yang)氣(qi)(qi)(qi)(qi)可使新(xin)鮮肉類保(bao)持(chi)其(qi)鮮紅色。水果蔬菜(cai)(cai)的新(xin)鮮可是營養不流失。
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