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醫用塑封袋經過高壓蒸汽滅菌后塑封袋壓后還是有氣排出正常嗎?

發布:lygjgbz瀏覽:2944次

在同一溫度下,濕熱的殺菌效力比干熱大,其原因有三:一是濕熱中細菌菌體吸收水分,蛋白質較易凝固,因蛋白質含水量增加,所需凝固溫度降低,二是濕熱的穿透力比干熱大;三是濕熱的蒸汽有潛熱存在,每1克水在100℃時,由氣態變為液態時可放出2.26kJ(千焦)的熱量。這種潛熱,能迅速提高被滅菌物體的溫度,從而增加滅菌效力。
在使用高壓蒸汽滅菌鍋滅菌時,滅菌鍋內冷空氣的排除是否完全極為重要,因為空氣的膨脹壓大于水蒸汽的膨脹壓,所以,當水蒸汽中含有空氣時,在同一壓力下,含空氣蒸汽的溫度低于飽和蒸汽溫度。

如果壓力未降到0時,打開排氣閥,就會因鍋內壓力突然下降,使容器內的培養基由于內外壓力不平衡而沖出燒瓶口或試管口,造成棉塞沾染培養基而發生污染。

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