Autoclave sterilizer

Autoclave sterilizer uses pressurized steam to eliminate microorganisms from laboratory and hospital equipment.

About this subject

An autoclave sterilizer is equipment that uses pressurized steam to sterilize materials. It works by heating water to produce steam, which is pressurized inside a sealed chamber, reaching temperatures between 121°C and 134°C. This process is standardized by the World Health Organization and regulatory bodies to ensure elimination of bacteria, viruses, fungi, and spores.

In microbiology and molecular biology labs, autoclaves are essential for sterilizing culture media, glassware, and contaminated waste. In hospitals, they process surgical instruments, linens, and reusable medical devices. Models include benchtop, vertical, and horizontal types, varying in capacity and cycle options.

Effectiveness depends on temperature, exposure time, and steam saturation. Typical cycles last 15 to 30 minutes at 121°C or 3 to 15 minutes at 134°C. Materials sensitive to moisture or heat, like certain plastics, cannot be autoclaved; alternative methods include ethylene oxide or radiation.

The autoclave principle was developed by Charles Chamberland in 1879, improving on Denis Papin's pressure cooker. Modern autoclaves feature digital controls, safety systems, and data logging for traceability, complying with standards such as ISO 17665.

Frequently Asked Questions

How long does an autoclave sterilization cycle take?

Cycle time depends on temperature and load. Typical cycles last 15, 30 minutes at 121°C or 3, 15 minutes at 134°C.

Which materials cannot be autoclaved?

Materials sensitive to heat or moisture, such as certain plastics, sharp blades, and volatile liquids, should not be autoclaved.

What is the minimum temperature for autoclave sterilization?

The standard minimum temperature is 121°C at approximately 1.1 kgf/cm² (15 psi). For more resistant items, 134°C is used.