Why 70 Percent Alcohol Disinfects Better Than 91 Percent, According to a Microbiologist - Deepstash

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Why 70 Percent Alcohol Disinfects Better Than 91 Percent, According to a Microbiologist

https://www.apartmenttherapy.com/isopropyl-alcohol-percent-disinfecting-36723904

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Why 70 Percent Alcohol Disinfects Better Than 91 Percent, According to a Microbiologist
You would think alcohol solutions with a higher percentage would be more powerful at killing germs, right? But according to microbiology, 70 percent alcohol is probably more effective than 91 percent for disinfecting-depending on what kind of germs you're trying to kill.

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Depending on what kind of germs you’re trying to kill, 70 percent alcohol is probably more effective than 91 percent for disinfecting.

A 90 percent alcohol solution is too powerful in some cases. It kills the outside of the cell before it can get into the inside and kill the actual germ.

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Alcohol percentages

  • To fend off bacteria, a 70 percent alcohol solution with water in it allows it to cross a cell membrane and kills the entire cell.
  • Viruses with an envelope structure, including the new virus, can be deactivated by alcohol solutions of 60 percent.
  • Any concentration of alcohol won't effectively target the norovirus.

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