真空(kong)充氣(qi)包(bao)裝(zhuang)在真空(kong)后再充入(ru)氮(dan)氣(qi)、二氧(yang)(yang)化碳、氧(yang)(yang)氣(qi)單一氣(qi)體或二 三(san)種氣(qi)體的混合氣(qi)體。其氮(dan)氣(qi)是惰(duo)性(xing)(xing)氣(qi)體,起充填作用(yong),使(shi)袋內保(bao)(bao)持(chi)(chi)正(zheng)壓 ,以防(fang)止袋外(wai)空(kong)氣(qi)進(jin)入(ru)袋內,對食(shi)品起到一個(ge)保(bao)(bao)護(hu)作用(yong)。其二氧(yang)(yang)化碳能夠溶于各(ge)類脂肪或水(shui),引成酸性(xing)(xing)較弱的碳酸,有(you)抑(yi)制霉菌(jun)(jun)、腐敗細菌(jun)(jun)等微(wei)生物的活性(xing)(xing)。其氧(yang)(yang)氣(qi)具有(you)抑(yi)制厭氧(yang)(yang)菌(jun)(jun)的生長繁殖,保(bao)(bao)持(chi)(chi)水(shui)果(guo)(guo)、蔬菜(cai)的新(xin)(xin)鮮(xian)及(ji)色彩,高濃(nong)度氧(yang)(yang)氣(qi)可(ke)(ke)使(shi)新(xin)(xin)鮮(xian)肉(rou)類保(bao)(bao)持(chi)(chi)其鮮(xian)紅色。水(shui)果(guo)(guo)蔬菜(cai)的新(xin)(xin)鮮(xian)可(ke)(ke)是營養(yang)不流(liu)失。
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