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Related Concept Videos

Methods of Sterilization I: Physical Methods01:29

Methods of Sterilization I: Physical Methods

As used in a healthcare facility, sterilization destroys all microorganisms through physical or chemical methods. The physical method includes steam, dry heat, boiling water, and radiation.
Steam sterilization uses non-toxic, low-cost moist heat in the form of saturated steam under pressure, which is fast, microbicidal, and sporicidal, and quickly warms and penetrates fabrics. Autoclaves, or steam sterilizers, expose each item to direct steam contact for a predetermined time at the necessary...
Methods of Sterilization II: Chemical Methods01:30

Methods of Sterilization II: Chemical Methods

In healthcare, the chemical method of sterilization uses chemical sterilants to treat surgical instruments and medical supplies to help prevent the transmission of infectious pathogens to patients. Due to heat sensitivity, most medical supplies and equipment should not be exposed to high temperatures. These parts include rubber, plastic, glass, and other similar elements.
Using chemical sterilization rather than heat to clean out equipment is recommended. It eradicates and removes all bacteria,...
Cleaning, Sterilization, and Disinfection01:30

Cleaning, Sterilization, and Disinfection

Cleaning, disinfection, and sterilization are the methods that help to break the infection chain and prevent disease.
Cleaning
The cleaning process usually involves using water with detergents or enzymatic cleaner and removing foreign material from objects and surfaces, including organic material such as body fluids or inorganic material like soil. Cleaning is performed before high-level disinfection and sterilization because foreign materials on the cover of the devices interfere with process...
Scale-Up Processes01:14

Scale-Up Processes

The scale-up of microbial fermentation processes is essential in industrial biotechnology, allowing the transition from laboratory-scale experiments to commercial-scale production while aiming to maintain product yield and quality. This process requires meticulous adjustment of equipment design, process parameters, and contamination control strategies to accommodate increasing culture volumes.At the laboratory scale, cultures are typically maintained in 1 to 10-liter glass or autoclavable...
Physical Methods for Controlling Microbial Growth: Radiation and Filtration01:26

Physical Methods for Controlling Microbial Growth: Radiation and Filtration

Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.
Key Techniques in Microbiology01:19

Key Techniques in Microbiology

Aseptic techniques prevent contamination, ensure experimental accuracy, and protect researchers and microbial cultures. These techniques are essential in clinical, industrial, and research settings where sterility is required.Maintaining Sterility in Laboratory PracticesScientists maintain sterility by sterilizing tools with heat or chemicals, disinfecting work surfaces, and handling cultures in controlled environments. Working near an open flame or within a laminar flow hood reduces the risk...

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Updated: Jun 27, 2026

Determining Viral Disinfection Efficacy of Hot Water Laundering
06:57

Determining Viral Disinfection Efficacy of Hot Water Laundering

Published on: June 21, 2022

An evaluation of sterilisation processes.

Dariusz Sladowski1, Iwona Grabska-Liberek, Joanna Olkowska-Truchanowicz

  • 1Department of Transplantology and Central Tissue Bank, Centre for Biostructure, Medical University of Warsaw, Warsaw, Poland. dariusz.sladowski@ib.amwaw.edu.pl

Alternatives to Laboratory Animals : ATLA
|November 26, 2008
PubMed
Summary
This summary is machine-generated.

Sterilization methods for medical devices and cell culture materials were evaluated for cytotoxicity. Ionizing irradiation, ethylene oxide, and steam sterilization showed no toxic residues on polystyrene and steel, unlike cold plasma.

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Area of Science:

  • Biocompatibility testing
  • Sterilization validation
  • Medical device manufacturing

Background:

  • Sterile environments are crucial for in vitro cell culture and medical device safety.
  • Sterilization processes can alter material properties and introduce toxicity.
  • Assessing cytotoxicity is essential for materials contacting human tissues.

Purpose of the Study:

  • To develop and apply a simple cytotoxicity test for evaluating sterilization methods.
  • To compare the safety of different sterilization procedures on polystyrene and steel.

Main Methods:

  • A novel in vitro cytotoxicity assay was developed using a non-adherent cell line.
  • Cells were cultured in direct contact with test materials subjected to various sterilization methods.
  • Three sterilization procedures (ionizing irradiation, ethylene oxide, steam, cold plasma) were assessed for polystyrene and steel.

Main Results:

  • Ionizing irradiation and ethylene oxide did not leave toxic residues on polystyrene.
  • Steam sterilization and ethylene oxide showed no toxic residues on steel.
  • Cold plasma resulted in toxic residues on both materials, requiring extended post-sterilization waiting periods.

Conclusions:

  • The developed cytotoxicity test effectively differentiates safe sterilization methods.
  • Specific sterilization methods are suitable for polystyrene and steel, while cold plasma requires careful management.
  • Ensuring material safety post-sterilization is critical for medical applications and cell culture.