真(zhen)空除(chu)(chu)(chu)氧(yang)(yang)除(chu)(chu)(chu)了抑制微生(sheng)物的生(sheng)長和繁殖(zhi)外，另一個重(zhong)要功能(neng)是防止(zhi)食(shi)(shi)品(pin)氧(yang)(yang)化，因油脂類食(shi)(shi)品(pin)中含(han)有大量不飽和脂肪酸，受(shou)(shou)氧(yang)(yang)的作(zuo)用(yong)(yong)而(er)氧(yang)(yang)化，使(shi)食(shi)(shi)品(pin)變味(wei)、變質(zhi)(zhi)，此外，氧(yang)(yang)化還(huan)使(shi)維生(sheng)素A和C損(sun)失，食(shi)(shi)品(pin)色(se)素中的 不穩定物質(zhi)(zhi)受(shou)(shou)氧(yang)(yang)的作(zuo)用(yong)(yong)，使(shi)顏色(se)變暗。所以，除(chu)(chu)(chu)氧(yang)(yang)能(neng)有效地防止(zhi)食(shi)(shi)品(pin)變質(zhi)(zhi)，保(bao)持其色(se)、香、味(wei)及(ji)營養價值。