真空(kong)包(bao)(bao)裝(zhuang)(zhuang)中(zhong)重要(yao)(yao)的其一(yi)環節是(shi)除氧,有利(li)于防(fang)止食品(pin)變(bian)(bian)質(zhi),其原(yuan)理也比較簡單,因食品(pin)霉(mei)腐變(bian)(bian)質(zhi)主要(yao)(yao)由微生(sheng)(sheng)(sheng)(sheng)物(wu)的活動造成, 而(er)大多(duo)數微生(sheng)(sheng)(sheng)(sheng)物(wu)(如(ru)霉(mei)菌和(he)酵(jiao)母菌)的生(sheng)(sheng)(sheng)(sheng)存(cun)是(shi)需(xu)(xu)要(yao)(yao)氧氣(qi)的,而(er)真空(kong)包(bao)(bao)裝(zhuang)(zhuang) 就是(shi)運(yun)用(yong)這(zhe)個原(yuan)理,把包(bao)(bao)裝(zhuang)(zhuang)袋(dai)內和(he)食品(pin)細胞內的氧氣(qi)抽掉(diao),使(shi)微生(sheng)(sheng)(sheng)(sheng)物(wu)失去(qu)“生(sheng)(sheng)(sheng)(sheng)存(cun)的環境(jing)”。實驗證(zheng)明:當包(bao)(bao)裝(zhuang)(zhuang)袋(dai)內的氧氣(qi)濃(nong)度(du)≤1%時, 微生(sheng)(sheng)(sheng)(sheng)物(wu)的生(sheng)(sheng)(sheng)(sheng)長(chang)和(he)繁(fan)(fan)殖(zhi)(zhi)(zhi)速(su)度(du)就急(ji)劇下(xia)降,氧氣(qi)濃(nong)度(du)≤0.5%,大多(duo)數微生(sheng)(sheng)(sheng)(sheng)物(wu)將受(shou)到抑制(zhi)而(er)停止繁(fan)(fan)殖(zhi)(zhi)(zhi)。(注:真空(kong)包(bao)(bao)裝(zhuang)(zhuang)不能抑制(zhi)厭氧菌的繁(fan)(fan)殖(zhi)(zhi)(zhi)和(he)酶(mei)反(fan)應引起(qi)的食品(pin)變(bian)(bian)質(zhi) 和(he)變(bian)(bian)色,因此還需(xu)(xu)與其他輔助(zhu)方(fang)法結(jie)合,如(ru)冷藏、速凍、脫(tuo)水、高溫殺菌、輻照滅菌(jun)、微波殺菌(jun)、鹽(yan)腌制等。
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