Trypan blue

Trypan blue (also known as trypan blue, or triphenylmethane blue) is a vital dye used in cell biology and histology. It is a deep blue dye that is used to stain living cells, dead cells, and cell components. It is commonly used to assess the viability of cells in cell culture. When Trypan blue comes in contact with live cells, it is taken up by the cell and stains the cells blue. Dead cells, however, do not take up the dye and remain unstained. This allows for easy identification of viable and non-viable cells. Trypan blue is also used for staining certain cellular components, such as nuclei and mitochondria, as well as for use in counting cells.

Trypan blue is a dye with two main applications:

1. Cell viability testing: In biology research, trypan blue is a vital stain used to distinguish between live and dead cells. Here's how it works:
   • Live cells have intact cell membranes that repel the dye.
   • Dead cells have compromised membranes, allowing the trypan blue to enter and stain the cytoplasm blue.
   • By looking at a cell sample under a microscope, researchers can easily differentiate between viable (unstained) and non-viable (blue stained) cells. This is a commonly used technique called the trypan blue exclusion test.
2. Textile dyeing: Trypan blue is also an azo dye used in the textile industry, particularly for dyeing cotton fabrics directly.