为什么医院用75%的酒精消毒?

为什么不用100%的酒精消毒?
2025-03-16 01:11:01
推荐回答(3个)
回答1:

酒精能渗入细菌体内,使组成细菌的蛋白质凝固。所以酒精在医疗卫生上常用它作消毒杀菌剂。为什么用70%~75%的酒精而不用纯酒精消毒呢?这是因为酒精浓度越高,使蛋白质凝固的作用越强。当高浓度的酒精与细菌接触时,就能使菌体表面迅速凝固,形成一层包膜,阻止了酒精继续向菌体内部渗透。细菌内部的细胞没能彻底杀死。待到适当时机,包膜内的细胞可能将包膜冲破重新复活。因此,使用浓酒精达不到消毒杀菌的目的。如果使用70%~75%的酒精,既能使组成细菌的蛋白质凝固,又不能形成包膜,能使酒精继续向内部渗透,而使其彻底消毒杀菌。经实验,若酒精的浓度低于70%,也不能彻底杀死细菌。

回答2:

我们知道,医用酒精含75%的乙醇并非纯酒精。护士给病人擦拭酒精是为了进行消毒,
那么酒精为什么能消毒呢?酒精的学名叫乙醇,它具有很大的渗透能力,能钻到细菌体内,
使细菌蛋白质凝固,从而杀死细菌。如实验室有些动物标本常泡在酒精里,就是这个原因。
.那为什么医用酒精含75%的乙醇并非纯酒糟呢?原来,当你用纯酒精消毒时,由于酒精的
浓度很大,很快使细菌表面的蛋白质凝固,结果形成一层硬膜,这层硬膜对细菌有保护作用,
防止酒精进一步渗入,所以,浓酒精反而不如稀酒精。在酒精里掺些水,酒精的浓度就变稀
了,稀酒精并不急于使细菌表面的蛋白质凝固,而是渗入到细菌体内,然后把整个细菌体内
的蛋白质凝固起来,从而达到杀菌的目地。

回答3:

100%酒精进入细菌速度太快 会使细菌产生一层膜阻止酒精进入 75%的酒精会缓慢进入细菌 不会使细菌产生抵抗 所以医用酒精是75%

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