A Complete Collection of 100000 Whys
Fav十万个为什么
为什么真空包装能保鲜？
真空包装能保鲜，主要是因为隔绝氧气抑制微生物生长、减少氧化反应以及抑制酶的活性。
1、隔绝氧气抑制微生物生长：真空包装通过抽出包装内的空气，减少了氧气的含量，抑制了好氧性微生物的生长繁殖，从而延长了食品的保质期。
2、减少氧化反应：氧气是导致食品氧化变质的重要因素，真空包装减少了氧气的存在，从而减缓了食品的氧化反应，例如脂肪的酸败和维生素的损失。
3、抑制酶的活性：许多食品中存在的酶在氧气的作用下会加速食品的腐败变质，真空包装通过降低氧气浓度，抑制了这些酶的活性，从而延缓了食品的变质过程。
总结：真空包装能保鲜，主要是因为隔绝氧气抑制微生物生长、减少氧化反应以及抑制酶的活性。
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