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Categories >> Sciences >> Biological Sciences >> Biological Sciences AllOther
 
 


 

 
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Question
How 70% alcohol  works  as disinfectant?
 Question Submitted By :: Biological-Sciences-AllOther
I also faced this Question!!     Answer Posted By  
 
Answer
# 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
 
Is This Answer Correct ?    52 Yes 4 No
Senthilkumar
 
Answer
# 2
so many experiments have been done which confirm that at
100% or 99% the bacterial wall closed. so that water can
come outside from the bacterial wall. the pricciple for
alcohal sterilzation is dehydration of bacterial cells. but
at 100% concentration pore at the cell mambrane remain
closed. but at 75% pore remain open so that water can come
outside from the pores and bacteria can dehydarate. and
kill microbes.
this is the real answer of this question "why we use 75 %
alcohal not 100% or 99%.
ok so no confusn, just read some books.
 
Is This Answer Correct ?    23 Yes 3 No
Dinesh Kumar , Phd.
 
 
 
Answer
# 3
it is disinfectant b'coz it breaks the cell wall of
bacteria and denature it's proteins
 
Is This Answer Correct ?    24 Yes 9 No
Himna
 
Answer
# 4
as an antiseptic, 70 percent of alcohol is prefered to a
stonger solution. 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.

Read more:
http://wiki.answers.com/Q/Why_is_70_percent_alcohol_a_better_disinfectant_than_100_percent_alcohol#ixzz1wyyIHrmO
 
Is This Answer Correct ?    15 Yes 0 No
Rohan Sharma
 
Answer
# 5
Bacterial cell wall breaks when exposed to 70 % alchohol 
Is This Answer Correct ?    25 Yes 15 No
Yasodha
 
Answer
# 6
Alcohol is an antimicrobial solution for killing the
bacteria and other insects
by the process of dehydration and denaturation of
proteins. Proteins will come outside from the bacteria due
to alcohol(70%). surface sterilization requires stability
of such
agents on the surface for more time which is not found in
absolute alcohol.So the absolute alcohol should be
diluted to 70% (the evaporation of alcohol is
delayed).This ensures the proper sterilization of the
surface
 
Is This Answer Correct ?    8 Yes 6 No
Anil Varghese P
 
Answer
# 7
as an antiseptic, 70 percent of alcohol is prefered to a stonger solution. 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. 
Is This Answer Correct ?    1 Yes 2 No
Anjali
 

 
 
 
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