真(zhen)空除(chu)氧(yang)除(chu)了抑(yi)制微生(sheng)(sheng)物(wu)的生(sheng)(sheng)長和繁(fan)殖外(wai)，另一個重要功能是防(fang)止食(shi)(shi)(shi)(shi)品(pin)氧(yang)化，因油(you)脂類食(shi)(shi)(shi)(shi)品(pin)中(zhong)含有(you)大(da)量不(bu)(bu)飽和脂肪酸，受(shou)氧(yang)的作(zuo)用(yong)而(er)氧(yang)化，使食(shi)(shi)(shi)(shi)品(pin)變(bian)(bian)味、變(bian)(bian)質，此外(wai)，氧(yang)化還(huan)使維生(sheng)(sheng)素(su)A和C損(sun)失，食(shi)(shi)(shi)(shi)品(pin)色(se)(se)(se)素(su)中(zhong)的 不(bu)(bu)穩(wen)定(ding)物(wu)質受(shou)氧(yang)的作(zuo)用(yong)，使顏色(se)(se)(se)變(bian)(bian)暗。所以，除(chu)氧(yang)能有(you)效地防(fang)止食(shi)(shi)(shi)(shi)品(pin)變(bian)(bian)質，保持其色(se)(se)(se)、香(xiang)、味及營養價值。