Question

Which of the following dye is used for staining mitochondria?

• A. Janus Green
• B. Saffranin
• C. Azure B
• D. Crystal violet

Answer 1

The correct option is A Janus Green

Janus Green B is a basic dye and vital stain used in histology. It is also used to stain mitochondria supravitally. The indicator Janus Green B changes colour according to the amount of oxygen present.

If oxygen is present - Indicator is oxidised to blue colour.

If oxygen is absent - Indicator is reduced to pink colour.

Saffranin or counter stain and crystal violets are commonly used to stain bacterial cells.

Azure B is generally used to stain blood smear.