Eosin
Eosin
Eosin (pronunciation: ee-oh-sin) is a fluorescent red dye resulting from the action of bromine on fluorescein. It can be used in a variety of applications, such as in staining during microscopy, in therapeutics, and in testing blood.
Etymology
The term "Eosin" is derived from the Greek word "ēōs", meaning "dawn". This is in reference to the pinkish-red color of the dye, which is reminiscent of the color of dawn.
Applications
Microscopy
In microscopy, eosin is often used as a counterstain to hematoxylin in H&E staining. Eosin stains the cytoplasmic components of cells, such as proteins, pink or red, while hematoxylin stains the nuclei blue.
Therapeutics
In therapeutics, eosin is used in the treatment of parasitic infections. It is also used in the diagnosis of various health conditions, such as eosinophilia and eosinophilic esophagitis.
Blood Testing
Eosin is used in blood testing to stain white blood cells, particularly eosinophils. The presence of eosinophils can indicate an allergic reaction or infection.
Related Terms
- Eosinophilia: A condition characterized by an abnormally high number of eosinophils in the blood or body tissues.
- Eosinophil: A type of white blood cell that is responsible for combating infection by parasites in the body.
- Eosinophilic esophagitis: A chronic immune system disease in which eosinophils build up in the esophagus.
External links
- Medical encyclopedia article on Eosin
- Wikipedia's article - Eosin
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