What is the percent by volume of rubbing alcohol that is recommended as a disinfectanat to prevent the spread of viruses and bacteria?
A. 30%
B. 40%
C. 70%
D. 90%
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What is the percent by volume of rubbing alcohol that is recommended as a disinfectanat to prevent the spread of viruses and bacteria?
A. 30%
B. 40%
C. 70%
D. 90%
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Answer:
C. 70%
Further Explanation:
Because 70% by volume of rubbing alcohols are more effective than 90% or 99%. Example of an alcohol that is 70% by volume is Isopropyl alcohol. Isopropyl alcohol, particularly in solutions between 60% and 90% alcohol with 10 – 40% purified water, is rapidly antimicrobial against bacteria, fungi, and viruses. Once alcohol concentrations drop below 50%, usefulness for disinfection drops sharply. Notably, higher concentrations of alcohol don’t generate more desirable bactericidal, virucidal, or fungicidal properties.
The presence of water is a crucial factor in destroying or inhibiting the growth of pathogenic microorganisms with isopropyl alcohol. Water acts as a catalyst and plays a key role in denaturing the proteins of vegetative cell membranes. 70% IPA solutions penetrate the cell wall more completely which permeates the entire cell, coagulates all proteins, and therefore the microorganism dies. Extra water content slows evaporation, therefore increasing surface contact time and enhancing effectiveness. Isopropyl alcohol concentrations over 91% coagulate proteins instantly. Consequently, a protective layer is created which protects other proteins from further coagulation.
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Answer:
C or D
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