A Complete Collection of 100000 Whys
Fav十万个为什么
为什么有的牛奶要冷藏，有的不需要？
牛奶是否需要冷藏取决于杀菌方式，巴氏杀菌奶因低温杀菌需冷藏，而超高温灭菌奶因高温杀菌可常温保存。
1、巴氏杀菌：巴氏杀菌奶采用低温（72-85℃）杀菌，保留更多营养，但仍有部分微生物存活，需冷藏以抑制细菌繁殖。
2、超高温灭菌：常温奶通过超高温（135-145℃）瞬时灭菌，杀灭所有微生物，因此可在常温下长期保存，无需冷藏。
3、营养与风味差异：巴氏杀菌奶因低温处理，保留更多营养成分和新鲜风味，但保质期短；超高温灭菌奶因高温处理，营养略有损失，但保质期长。
总结：牛奶是否需要冷藏取决于杀菌方式，巴氏杀菌奶因低温杀菌需冷藏，而超高温灭菌奶因高温杀菌可常温保存。
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