Alcohols:
Alcohols in common have germicidal property with a rise in germicidal action with the raise in molecular weight. Ethyl alcohol is mostly employed. Methyl alcohol is less bactericidal and poisonous. Apart from propyl alcohol the higher alcohols such as butyl, amyl and so on are not employed since of their immiscibility with water. Ethyl alcohol (i.e., Ethanol) between 50 to 90% is efficient against vegetative and non spore forming cells though 70% is more general in use. Ethanol (70%) is employed in surface sterilization in laboratory, since antiseptic agent on skin before injection and also for disinfection of oral thermometers. Alcohol concentration of 60% and above is efficient against viruses too.
The antimicrobial action of alcohol is due to its de-naturation of proteins, solubilization of lipids of cell membrane and by the dehydration of cells. Absolute alcohol (i.e., free from water) is ineffective against dry cells since of its poor penetrating ability than its aqueous solutions.
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