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Fav十万个为什么
为什么食品放久了会腐败变质？
食品放久了会腐败变质，主要是因为微生物的生长繁殖、酶的作用以及氧化反应的发生。
1、微生物的生长繁殖：细菌、霉菌等微生物在适宜的条件下会迅速繁殖，分解食品中的有机物，导致食品腐败变质，产生酸臭味、变色等。
2、酶的作用：食品本身含有的酶或在微生物分泌的酶的作用下，会催化食品中的营养成分发生分解，如蛋白质分解为氨基酸，脂肪分解为脂肪酸和甘油，影响食品的口感和安全性。
3、氧化反应：食品中的脂肪、维生素等成分与空气中的氧气发生氧化反应，导致食品变色、变味，如脂肪氧化产生酸败味，影响食品的风味和营养价值。
总结：食品放久了会腐败变质，主要是因为微生物的生长繁殖、酶的作用以及氧化反应的发生。
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