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下列生活中保存食物的方法,理解错误的是: A.盐腌制食品是因为盐可以形成高渗环境,抑制了微生物的生理活动 真空保存食物可以破坏需氧菌类的生存环境 C.充入氮气保存食品是为了隔绝食品与氧气接触 D.冷藏保存食品是因为低温可以将细菌冻死

单选题
2022-03-12 05:06
A、盐腌制食品是因为盐可以形成高渗环境,抑制了微生物的生理活动
B、真空保存食物可以破坏需氧菌类的生存环境
C、充入氮气保存食品是为了隔绝食品与氧气接触
D、冷藏保存食品是因为低温可以将细菌冻死
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正确答案
D

试题解析
食盐腌制食物可以有效地延长食物的保质期原因是,细菌在高浓度盐溶液中由于外部的浓度远远大与内部的渗透压,致使内部的水分向细胞外渗透,最终细菌脱水死亡,没有细菌的侵蚀.食物在盐腌制时,内部的水分流向细胞外,细菌也不能生存。真空包装能够长时间保存食物的原因将空气隔绝,杜绝细菌滋生。氮气可以保存食品这与氮气的性质有关,它不活泼,属于惰性气体,不会与食物等发生反应,而且可以隔绝氧气,避免氧化反应。冷冻保藏的原理就是利用水分冻结来抑制微生物的生长繁殖(不是杀死微生物),延缓食品及微生物中的各种生化反应,抑制各种酶类的活性,以达到保藏食品的目的。因此,本题答案为D。

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