Catalase test

Definition

The catalase test is a biochemical test used to identify organisms that produce the enzyme catalase. Catalase breaks down hydrogen peroxide into water and oxygen, making it essential for protecting cells from oxidative damage.

5 Must Know Facts For Your Next Test

1. Catalase-positive bacteria include Staphylococcus species, which are common skin pathogens.
2. Catalase-negative bacteria include Streptococcus species, which are also implicated in skin and eye infections.
3. A positive catalase test results in bubbling upon application of hydrogen peroxide due to oxygen release.
4. The catalase test helps differentiate between staphylococci (catalase-positive) and streptococci (catalase-negative).
5. Catalase activity can help bacteria survive in environments with oxidative stress, such as on the skin where reactive oxygen species are present.

Review Questions

Related terms

Staphylococcus:

A genus of gram-positive bacteria known for being catalase-positive and causing various skin infections.

Streptococcus:

A genus of gram-positive bacteria that are typically catalase-negative and can cause skin and eye infections.

Oxidative Stress:

A condition characterized by excessive reactive oxygen species that can damage cellular components.