Why Is 70% Alcohol Preferred for Sterilization Over Higher Concentrations?

Discover why 70% alcohol is more effective for sterilization than higher concentrations and how it kills bacteria efficiently.

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70% alcohol is used for sterilization because it is more effective at killing bacteria than higher concentrations. It penetrates cell walls, causing proteins to denature, which effectively kills the microorganisms. Higher concentrations would evaporate too quickly to achieve this effect.

FAQs & Answers

  1. Why is 70% alcohol more effective than 90% alcohol for sterilization? Because 70% alcohol penetrates bacterial cell walls better and denatures proteins effectively, while higher concentrations evaporate too quickly to kill microorganisms.
  2. How does alcohol kill bacteria during sterilization? Alcohol kills bacteria by penetrating cell walls and denaturing proteins, which disrupts cellular functions and leads to microorganism death.
  3. Can higher concentrations of alcohol be used for sterilization? Higher concentrations evaporate too fast and are less effective in protein denaturation, making 70% the optimum concentration for reliable sterilization.