真空(kong)除(chu)氧(yang)(yang)除(chu)了(le)抑制微(wei)生(sheng)(sheng)(sheng)物的生(sheng)(sheng)(sheng)長和繁殖外(wai)，另一個重要功能是防止(zhi)食(shi)品氧(yang)(yang)化(hua)，因油脂類食(shi)品中(zhong)含(han)有大量不飽和脂肪(fang)酸，受氧(yang)(yang)的作用(yong)而氧(yang)(yang)化(hua)，使(shi)食(shi)品變(bian)(bian)味、變(bian)(bian)質(zhi)。此(ci)外(wai)，氧(yang)(yang)化(hua)還使(shi)維生(sheng)(sheng)(sheng)素A和維生(sheng)(sheng)(sheng)素C損失，食(shi)品色(se)素中(zhong)的不穩定物質(zhi) 受氧(yang)(yang)的作用(yong)，使(shi)顏色(se)變(bian)(bian)暗。所(suo)以，除(chu)氧(yang)(yang) 能有效地防止(zhi)食(shi)品變(bian)(bian)質(zhi)，保持其(qi)色(se)、香、味及(ji)營(ying)養價值。