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Antiseptic Vs. Disinfectant
Cheryl Jones
Antiseptics and disinfectants are the basic tools of cleaning and
sanitizing, yet the difference between the two substances is unclear.
Knowing the difference between antiseptics and disinfectants and
how each works to sterilize wounds or surfaces can help you select the most
appropriate product for your needs.
Difference
Both antiseptics and disinfectants eliminate disease-causing
organisms, notes the Mount Sinai Department of Microbiology.
The difference is in how each substance is used.
Antiseptics are applied to living skin or tissue to prevent
infection, whereas disinfectants are applied to surfaces, equipment or other
inanimate objects.
Disinfectants are stronger and more toxic than antiseptics because
they are applied to surfaces, not living tissue.
Significance
Sterilization kills or removes all living organisms, including
viruses, bacteria and cells, from an object, explains Mount Sinai.
Disinfection kills or removes disease-causing organisms, but not
necessarily all organisms present on an object.
Heat, radiation, filtration or chemical processes are used to
sterilize objects such as medical instruments or surgical or laboratory
equipment.
If properly sealed, a sterilized object will remain sterile until
the seal is broken. Sterilization is uncommon outside of hospital or laboratory
settings. In most situations, disinfection is appropriate.
Biocides
A biocide is a chemical that acts against organisms. Such
chemicals are the active ingredients in antiseptics and disinfectants.
Biocides are classified as those that kill organisms or those that
inhibit growth.
Common antiseptics are chlorhexidine, iodine, 70 percent ethanol
and 3 percent hydrogen peroxide, according to Mount Sinai.
Widely used disinfectants include alcohol, glutaraldehyde, iodine,
copper sulfate, ozone and chlorine gas.
Some agents, such as chlorhexidine and iodine, can be used as
either an antiseptic or disinfectant.
Function
Antiseptics and disinfectants work similarly. The agents penetrate
the cell wall of the organism, such as bacteria.
Inside the cell, the action depends on the specific chemical
contained in the antiseptic or disinfectant.
In general, antiseptic and disinfectant agents damage the cell
membrane, disrupt cell metabolism or alter the permeability of the cell wall.
Resistance
Not all organisms respond to all disinfectants and antiseptics,
and some organisms develop tolerance or resistance.
Some types of organisms are naturally resistant to certain types
of biocides.
For example, bacteria classified as Gram-negative, which include
Escherichia coli and Staphylococcus aureus, tend to be more resistant to
biocidal agents than other types of bacteria.
Mutations in viruses or bacteria can create acquired resistance to
widely used agents.
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