真(zhen)(zhen)空包裝不能(neng)抑制厭氧(yang)菌(jun)(jun)的繁殖(zhi)和酶反應引起的食(shi)品(pin)(pin)(pin)變(bian)(bian)(bian)質和變(bian)(bian)(bian)色(se),因(yin)此還需(xu)與其(qi)它輔助方法結合,如(ru)冷藏、速凍(dong)、脫水、高(gao)溫殺菌(jun)(jun)、輻照(zhao) 滅菌(jun)(jun)、微波殺菌(jun)(jun)、鹽腌制等(deng)。真(zhen)(zhen)空除氧(yang)除了抑制微生(sheng)(sheng)物的生(sheng)(sheng)長和繁殖(zhi)外(wai),另一(yi)個重要功能(neng)是防止食(shi)品(pin)(pin)(pin)氧(yang)化(hua)(hua),因(yin)油脂類食(shi)品(pin)(pin)(pin)中(zhong)含有(you)(you)大量不飽(bao)和脂肪酸,受氧(yang)的作(zuo)用(yong)(yong)而氧(yang)化(hua)(hua),使(shi)食(shi)品(pin)(pin)(pin)變(bian)(bian)(bian)味、變(bian)(bian)(bian)質,此外(wai),氧(yang)化(hua)(hua)還使(shi)維生(sheng)(sheng)素A和C損失,食(shi)品(pin)(pin)(pin)色(se)素中(zhong)的不穩定物質受氧(yang)的作(zuo)用(yong)(yong),使(shi)顏色(se)變(bian)(bian)(bian)暗。所(suo)以,除氧(yang)能(neng)有(you)(you)效地(di)防止食(shi)品(pin)(pin)(pin)變(bian)(bian)(bian)質,保持其(qi)色(se)、香、味及營養價(jia)值。
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