真(zhen)空袋主(zhu)要(yao)作用是(shi)除氧(yang)(yang),以有(you)利于防止食(shi)品變質(zhi),其原理也比較簡單,因食(shi)品霉腐變質(zhi)主(zhu)要(yao)由微生(sheng)(sheng)(sheng)(sheng)物(wu)(wu)(wu)的(de)活動(dong)造成,而大多(duo)數微生(sheng)(sheng)(sheng)(sheng)物(wu)(wu)(wu)(如霉菌和酵母(mu)菌)的(de)生(sheng)(sheng)(sheng)(sheng)存是(shi)需(xu)要(yao)氧(yang)(yang)氣的(de),而真(zhen)空包裝就是(shi)運用這個原理,把(ba)包裝袋內和食(shi)品細胞內的(de)氧(yang)(yang)氣抽掉,使微物(wu)(wu)(wu)物(wu)(wu)(wu)失去“生(sheng)(sheng)(sheng)(sheng)存的(de)環(huan)境”。實驗證明:當包裝袋內的(de)氧(yang)(yang)氣濃度≤1%時(shi),微生(sheng)(sheng)(sheng)(sheng)物(wu)(wu)(wu)的(de)生(sheng)(sheng)(sheng)(sheng)長(chang)和繁殖速度就急劇下降,氧(yang)(yang)氣濃度≤0.5%時(shi),大多(duo)數微生(sheng)(sheng)(sheng)(sheng)物(wu)(wu)(wu)將受到(dao)抑制(zhi)而停止繁殖。
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