真(zhen)空袋(dai)主要(yao)作(zuo)用是(shi)除氧(yang)(yang),以有(you)利(li)于防止食(shi)品變(bian)質,其原理也比較簡單,因(yin)食(shi)品霉腐變(bian)質主要(yao)由(you)微(wei)(wei)生(sheng)(sheng)(sheng)物(wu)的(de)活(huo)動(dong)造成(cheng),而大多數(shu)(shu)微(wei)(wei)生(sheng)(sheng)(sheng)物(wu)(如(ru)霉菌和酵母菌)的(de)生(sheng)(sheng)(sheng)存是(shi)需要(yao)氧(yang)(yang)氣(qi)的(de),而真(zhen)空包(bao)裝就(jiu)是(shi)運用這個原理,把包(bao)裝袋(dai)內和食(shi)品細胞(bao)內的(de)氧(yang)(yang)氣(qi)抽掉,使微(wei)(wei)物(wu)物(wu)失去“生(sheng)(sheng)(sheng)存的(de)環境”。實(shi)驗(yan)證明:當(dang)包(bao)裝袋(dai)內的(de)氧(yang)(yang)氣(qi)濃度≤1%時,微(wei)(wei)生(sheng)(sheng)(sheng)物(wu)的(de)生(sheng)(sheng)(sheng)長和繁(fan)殖速度就(jiu)急劇(ju)下降,氧(yang)(yang)氣(qi)濃度≤0.5%時,大多數(shu)(shu)微(wei)(wei)生(sheng)(sheng)(sheng)物(wu)將(jiang)受到抑制而停(ting)止繁(fan)殖。
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