真(zhen)空(kong)包(bao)裝不能(neng)抑(yi)制(zhi)厭氧(yang)(yang)(yang)菌的(de)繁殖和(he)酶反(fan)應(ying)引起(qi)的(de)食(shi)(shi)品變(bian)質(zhi)(zhi)和(he)變(bian)色(se),因此還(huan)(huan)需與其(qi)它(ta)輔助(zhu)方法結合,如冷藏(zang)、速(su)凍、脫水(shui)、高(gao)溫殺(sha)(sha)菌、輻(fu)照 滅菌、微波殺(sha)(sha)菌、鹽腌(a)制(zhi)等。真(zhen)空(kong)除氧(yang)(yang)(yang)除了(le)抑(yi)制(zhi)微生(sheng)(sheng)物(wu)的(de)生(sheng)(sheng)長和(he)繁殖外,另一(yi)個重要功能(neng)是防止(zhi)食(shi)(shi)品氧(yang)(yang)(yang)化(hua),因油脂類食(shi)(shi)品中(zhong)含有(you)(you)大(da)量不飽(bao)和(he)脂肪酸,受氧(yang)(yang)(yang)的(de)作用(yong)而氧(yang)(yang)(yang)化(hua),使食(shi)(shi)品變(bian)味、變(bian)質(zhi)(zhi),此外,氧(yang)(yang)(yang)化(hua)還(huan)(huan)使維(wei)生(sheng)(sheng)素A和(he)C損失,食(shi)(shi)品色(se)素中(zhong)的(de)不穩(wen)定物(wu)質(zhi)(zhi)受氧(yang)(yang)(yang)的(de)作用(yong),使顏色(se)變(bian)暗(an)。所以,除氧(yang)(yang)(yang)能(neng)有(you)(you)效地防止(zhi)食(shi)(shi)品變(bian)質(zhi)(zhi),保(bao)持(chi)其(qi)色(se)、香、味及營(ying)養價值。
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