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Answer Posted / gazanfar abass
I believe their are various reasons that why 70% alcohol is more effective disinfectant than absolute alcohol. Out of all, the two important reasons are
1) Alcohol is an antimicrobial compound killing the bacteria
by the process of dehydration and denaturation of
proteins. Surface sterilization requires stability of such
agents on the surface for more time which is not found in
absolute alcohol(99%).So the absolute alcohol should be
diluted to 70% so that the evaporation of alcohol is
delayed.This ensures the proper sterilization of the surface
2)Pure alcohol coagulates protein in
contact. Suppose the pure alcohol is poured ovr a single
celled organism. Th alcohol will penetrate the cell wall of
the organism in all direction, coagulating the protein just
inside the cell wall. the ring of the coagulated protein
would then prevent the alcohol from penetrating farther from
the cell, and no more coagulation woul take place. At this
time the cell would become dormant butnot dead. under the
proper condition the cell would then begin to function. if
70 percent of alcohol is poured to a single celled organism,
the diluted alcohol also coagulates the protein, but at a
slower rate, so that it penetrates all the way through the
cell before coagulation can block it. then all the cell is
coagulated and the organism dies.
Further, as i said their many reasons, so any one knows any reasons other than the above two, i will be pleased if you forward that to me on my email ID that is gazanfar0966@gmail.com
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