Anaerobic Jars – Applications, Types, Uses, and Working Principle

What Is an Anaerobic Jar? 

An anaerobic jar is a sealed laboratory container used to create an oxygen-free or low-oxygen environment for incubating anaerobic microorganisms using gas-generating systems or controlled gas replacement.

What Is an Anaerobic Jar Used For?

An anaerobic jar is used to grow and study microorganisms that require oxygen-free conditions.

Common Applications:

• Cultivation of anaerobic bacteria

• Clinical diagnostic testing

• Antibiotic susceptibility testing

• Food and environmental microbiology

• Pharmaceutical microbial quality control

Why Use an Anaerobic Jar Instead of Other Systems?

Anaerobic jars provide a compact method for creating controlled anaerobic conditions inside standard incubators.

How Does an Anaerobic Jar Work? 

An anaerobic jar removes oxygen and replaces it with a controlled gas environment.

Process:

1. Culture plates are placed inside the jar

2. Gas-generating sachet is added or gas is injected

3. Jar is sealed airtight

4. Oxygen is absorbed or displaced

5. Indicator confirms anaerobic conditions

6. Jar is placed in an incubator for growth

Types of Anaerobic Jars

1.Gas-Generating Sachet Jars

   Use disposable sachets to remove oxygen.

2. Valve-Controlled Jars

    Allow gas replacement using external gas sources.

3. Polycarbonate Jars

    Transparent units for routine laboratory use.

4. Stainless Steel Jars

     Used in high-throughput or industrial environments.

Which Anaerobic Jar Should You Choose?

Selection depends on workflow and control requirements.

 Quick Decision Guide:

• Use sachet-based jars → for routine clinical work

• Use valve-controlled jars → for precise gas control

• Use polycarbonate → for visibility and standard use

• Use stainless steel → for frequent, heavy use

Where Are Anaerobic Jars Used?

They are used in:

• Clinical microbiology laboratories

• Pharmaceutical testing labs

• Biotechnology research facilities

• Academic laboratories

• Environmental testing labs

When Should You Use an Anaerobic Jar?

Use an anaerobic jar when:

• Culturing anaerobic bacteria

• Performing short-term incubation

• Working with limited sample volume

• Using standard incubators

Key Parameters in Anaerobic Jars

Performance depends on:

• Airtight sealing

• Plate capacity

• Gas generation method

• Oxygen indicator accuracy

• Durability of materials

Anaerobic Jar vs Anaerobic Chamber 

Alternative and Complementary Equipment

• Anaerobic chambers for continuous work

• CO₂ incubators for controlled atmospheres

• Biological safety cabinets for sample preparation

• Laboratory incubators for temperature control

Design Features of Modern Anaerobic Jars

• Airtight sealing lids

• Transparent construction

• Gas valve or sachet compatibility

• Pressure control features

• Oxygen indicator integration

Frequently Asked Question

Q1. What does an anaerobic jar do?

       It creates an oxygen-free environment for growing anaerobic microorganisms.

Q2. How is oxygen removed from the jar?

       Using gas-generating sachets or gas replacement methods.

Q3. Can it be used in clinical labs?

       Yes, it is widely used for culturing anaerobic pathogens.

Q4. How many plates can fit inside?

      Capacity varies depending on the jar size and model.

Q5. Is an oxygen indicator necessary?

     Yes, it confirms that anaerobic conditions are achieved.

Q6. What is the difference between a jar and a chamber?

      A jar is for sealed incubation, while a chamber allows continuous manipulation.

Q7. How long does it take to create anaerobic conditions?

       Usually within a short time after sealing.

Q8. What organisms are grown in anaerobic jars?

       Obligate anaerobic bacteria and oxygen-sensitive microorganisms.

Quick Summary