Question

Which test can be used to check the purity of lactic starter cultures?

• A. Oxidase test
• B. Catalase test
• C. Indole test
• D. Creatine test

Hint:

All true Lactic Acid Bacteria (such as lactococci, lactobacilli, and streptococci) are catalase-negative.
Any positive reaction (bubbling with \( \text{H}_2\text{O}_2 \)) in a starter culture is an immediate indication of contamination.

Answer 1

The Correct Option is B