真(zhen)空(kong)除(chu)氧(yang)(yang)(yang)(yang)除(chu)了抑制微生(sheng)物的生(sheng)長和繁殖外，另一個重要功能(neng)是防(fang)止食(shi)(shi)品氧(yang)(yang)(yang)(yang)化，因油脂類食(shi)(shi)品中(zhong)含有大量不(bu)飽和脂肪酸，受氧(yang)(yang)(yang)(yang)的作(zuo)(zuo)用而氧(yang)(yang)(yang)(yang)化，使(shi)食(shi)(shi)品變(bian)味、變(bian)質。此外，氧(yang)(yang)(yang)(yang)化還使(shi)維(wei)生(sheng)素A和維(wei)生(sheng)素C損失，食(shi)(shi)品色素中(zhong)的不(bu)穩(wen)定(ding)物質 受氧(yang)(yang)(yang)(yang)的作(zuo)(zuo)用，使(shi)顏色變(bian)暗。所以，除(chu)氧(yang)(yang)(yang)(yang) 能(neng)有效地防(fang)止食(shi)(shi)品變(bian)質，保持其色、香、味及營(ying)養(yang)價值(zhi)。