How does heat sterilization kill bacteria?

Asked By: Nikole Trilho | Last Updated: 13th June, 2020
Category: home and garden indoor environmental quality
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Moist heat sterilization is a procedure in which heated, high-pressure steam is used to sterilize an object, killing any bacteria, viruses, or spores that may have contaminated the object. Moist heat sterilization works by denaturing the proteins of potentially infectious microorganisms.

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Simply so, how does heat sterilization work?

Process. The dry heat sterilization process is accomplished by conduction; that is where heat is absorbed by the exterior surface of an item and then passed inward to the next layer. Dry heat destroys microorganisms by causing denaturation of proteins.

Beside above, how does sterilization work to kill bacteria? Sterilization is the killing or removal of all microorganisms, including bacterial spores, which are highly resistant. Surgical instruments that can be damaged by moist heat are usually sterilized by exposure to ethylene oxide gas, and most intravenous solutions are sterilized by filtration.

Similarly one may ask, how does dry heat kill bacteria?

Dry heat helps kill the organisms using the destructive oxidation method. This helps destroy large contaminating bio-molecules such as proteins. The essential cell constituents are destroyed and the organism dies. The temperature is maintained for almost an hour to kill the most difficult of the resistant spores.

What conditions are required for sterilization by moist heat?

Sterilization involving lower temperature and high-pressure of water (steam) is known as Moist Heat Sterilization. Sterilization involving the dry air of higher temperature and for the longer time is known as Dry Heat Sterilization. As the name says, it needs steam and water. There is no use of steam and water.

35 Related Question Answers Found

What are the 3 types of sterilization?

Three primary methods of medical sterilization occur from high temperature/pressure and chemical processes.
  • Plasma Gas Sterilizers.
  • Autoclaves.
  • Vaporized Hydrogen Peroxide Sterilizers.

What is the principle of hot air dry heat sterilization?

The principle of hot air oven dry heat sterilization
What dry heat sterilization does is it inflicts damage by oxidizing molecules leading to the organism's death. Resistant spores are killed by exposing them at a higher temperature for a long period of time.

What is the principle of hot air oven?

Hot air ovens are electrical devices which use dry heat to sterilize. They were originally developed by Pasteur. Generally, they use a thermostat to control the temperature. Their double walled insulation keeps the heat in and conserves energy, the inner layer being a poor conductor and outer layer being metallic.

What is the principle of autoclaving?

Autoclaves Working Principle:
Autoclaves use pressurized steam as their sterilization agent. The basic concept of an autoclave is to have each item sterilized -whether it is a liquid, plastic ware, or glassware- come in direct contact with steam at a specific temperature and pressure for a specific amount of time.

What are the 4 methods of sterilization?

Different sterilization methods used in the laboratory. Sterilization can be achieved by a combination of heat, chemicals, irradiation, high pressure and filtration like steam under pressure, dry heat, ultraviolet radiation, gas vapor sterilants, chlorine dioxide gas etc.

At what temperature is sterilization done?

Typical sterilization temperatures and times are 132°C to 135°C with 3 to 4 minutes exposure time for porous loads and instruments. Like other sterilization systems, the steam cycle is monitored by mechanical, chemical, and biological monitors.

Does heat sterilize?

Dry, hot air is much less effective in transferring heat than moist heat. This is why microorganisms are much more able to withstand heat in a dry state. The dry heat sterilization process takes a long long time and is done at a high temperature (2 hours at 160°C).

What are the most common forms of heat sterilization?

The main sterilization methods that are widely used include thermal, chemical and high-energy radiation processes. Heat and steam sterilizations are typically used for items such as metal instruments and liquids that remain stable at high temperatures.

What is an example of dry heat sterilization?

Several types include hot air oven, incineration, and flaming. Objects that cannot get wet, glassware, oils, powder, metal instruments, and paper wrapped items use dry heat for sterilization. Validation is a series of tests to make sure that the dry heat instruments are working as intended.

What is the most effective physical method for sterilization?

The autoclave is still considered the most effective method of sterilization. Outside laboratory and clinical settings, large industrial autoclaves called retorts allow for moist-heat sterilization on a large scale.

What is the simplest method of dry heat sterilization?

Dry heat sterilization (killing or removal of all microorganisms, including bacterial spores) technique requires longer exposure time (1.5 to 3 hours) and higher temperatures than moist heat sterilization. Various available methods of dry heat sterilization are; hot air oven, incineration, flaming (wire loop) etc.

Does dry heat kill endospores?

But you must remember that it is the temperature that is killing the endospores, not the pressure. The reason that moisy heat is better is because dry heat kills by oxidation but some bacteria can survive this. The heat of the hot air is not readily transferred and hence is not as effective.

What is chemical method of sterilization?

Chemical sterilization is the elimination of all viable microorganisms and their spores using liquid or gaseous compounds. The method you use for chemical sterilization varies with the form of chemical you use. Gas sterilization involves exposing equipment to chemical gases in an enclosed heated or pressurized chamber.

Why is wet heat effective?

Benefits of Moist Heating Pads
Moist heat is more effective than dry heat, in providing deeper penetration of the tissue at the same temperature. Moist heat can speed recovery by increasing blood flow to targeted area. Increased circulation brings in fresh blood and takes away the wastes which may slow healing.

What is the relationship of time to temperature in heat sterilization?

therefore dry heat sterilization requires longer treatment times than moist heat . What is the relationship of time to temperature in heat sterilization? Explain. The higher the temperature the less amount of time needed for sterilization and vice versa.

What is the difference between moist and dry heat?

What is the difference between moist and dry heat? However, moist heat is more effective than dry heat in providing deeper penetration of the tissue at the same temperatures. Moist heat also has additional capacity to change the tissue temperature rapidly and obtain more vigorous response from temperature receptors.

What is the difference between sterilization and disinfection?

Disinfection and sterilization are both decontamination processes. While disinfection is the process of eliminating or reducing harmful microorganisms from inanimate objects and surfaces, sterilization is the process of killing all microorganisms. That is the main difference between sterilizing and disinfecting.