Auramine O

Auramine O

Chemical structure of Auramine O

Auramine O is a diarylmethane dye used primarily as a fluorescent stain in microbiology and histology. It is known for its bright yellow fluorescence and is commonly used in the Ziehl-Neelsen stain for the detection of Mycobacterium tuberculosis and other acid-fast bacteria.

Chemical Properties

Auramine O is a diarylmethane compound with the chemical formula C₁₇H₂₂ClN₃. It is a cationic dye that binds to acidic components of cells, such as nucleic acids and acidic polysaccharides.

Applications

Microbiology

In microbiology, Auramine O is used as a fluorescent stain to identify acid-fast bacteria. The dye binds to the mycolic acid in the cell walls of these bacteria, allowing them to be visualized under a fluorescence microscope. This is particularly useful in the diagnosis of tuberculosis and other mycobacterial infections.

Histology

In histology, Auramine O is used to stain tissue sections for the presence of acid-fast organisms. It is often used in combination with other stains, such as rhodamine, to enhance the contrast and visibility of the stained structures.

Safety and Handling

Auramine O is considered a hazardous chemical and should be handled with care. It is important to use appropriate personal protective equipment (PPE) when working with this dye, including gloves, goggles, and lab coats.

Related Pages

• Fluorescent Staining
• Ziehl-Neelsen Stain
• Mycobacterium tuberculosis
• Histology
• Microbiology