Gas-pak

Gas-pak

The Gas-pak system is a widely used method in microbiology for creating an anaerobic environment in a laboratory setting. This system is essential for the cultivation of anaerobic bacteria, which require environments devoid of oxygen to grow. The Gas-pak system is a convenient and efficient way to achieve such conditions without the need for complex equipment.

Overview

The Gas-pak system typically consists of a sachet or envelope containing chemicals that, when activated, produce hydrogen and carbon dioxide gases. These gases are released into a sealed container, such as an anaerobic jar, where the microbial cultures are placed. The hydrogen gas reacts with oxygen present in the jar, in the presence of a palladium catalyst, to form water, thereby removing oxygen and creating an anaerobic environment.

Components

Gas-pak Sachet

The sachet contains chemicals such as sodium borohydride and sodium bicarbonate. When water is added to the sachet, a chemical reaction occurs, producing hydrogen and carbon dioxide gases.

Anaerobic Jar

The anaerobic jar is a robust, airtight container that holds the culture plates and the Gas-pak sachet. It is designed to withstand the pressure changes that occur during the gas production process.

Palladium Catalyst

A palladium catalyst is often included in the system to facilitate the reaction between hydrogen and oxygen. The catalyst is typically coated onto a support material and placed inside the jar.

Procedure

1. Preparation: Place the culture plates inside the anaerobic jar. 2. Activation: Add water to the Gas-pak sachet to initiate the chemical reaction. 3. Sealing: Quickly seal the jar to ensure no external air enters. 4. Incubation: Place the sealed jar in an incubator at the desired temperature for the growth of the anaerobic organisms.

Applications

The Gas-pak system is used in clinical laboratories, research facilities, and educational institutions for the cultivation of anaerobic bacteria such as *Clostridium* and *Bacteroides*. It is also used in the study of anaerobic infections and in the production of certain fermented foods.

Advantages

- Simplicity: The system is easy to use and does not require complex equipment. - Cost-effective: It is relatively inexpensive compared to other anaerobic culture methods. - Portability: The system is compact and can be used in various settings.

Limitations

- Limited Capacity: The size of the anaerobic jar limits the number of culture plates that can be processed at one time. - Time Sensitivity: The system requires careful timing to ensure the sachet is activated and the jar is sealed promptly.

Also see

- Anaerobic bacteria - Anaerobic culture techniques - Microbial growth - Palladium catalyst