hemin
Definition
Noun: A reddish-brown crystalline compound that is the chloride salt of heme (ferriprotoporphyrin). It is formed when hemoglobin is treated with a strong acid and sodium chloride in a laboratory setting, and its formation serves as a chemical test for the presence of blood.
Usage
The word "hemin" is a technical, scientific term used primarily in chemistry, biochemistry, and forensic science. It refers specifically to the crystalline product of a defined chemical reaction used to detect heme, the iron-containing component of hemoglobin.
Examples
- Forensic scientists can perform the hemin crystal test, also known as the Teichmann test, to confirm the presence of blood at a crime scene.
- Under the microscope, the characteristic reddish-brown crystals of hemin are easily identifiable.
- The formation of hemin is a reliable indicator that the sample contains heme from hemoglobin.
Advanced Usage
- "Hemin test": The standard name for the forensic procedure that detects blood by inducing the formation of hemin crystals.
- "Hemin crystals": The specific crystalline form of the compound as observed under a microscope.
Variants and Related Words
- Heme (noun): The iron-containing, non-protein component of hemoglobin and other hemoproteins, from which hemin is derived.
- Hematin (noun): Another hydroxide form of ferriheme, closely related to but chemically distinct from hemin.
- Protoporphyrin (noun): The organic porphyrin ring that forms the core structure of heme and hemin.
Synonyms
- Ferriheme chloride: A systematic chemical name for hemin.
- Teichmann's crystals: An eponymous term referring to the crystals formed in the hemin test.
Notes on Meaning
This word has a single, precise scientific meaning. It is not used in general or figurative language.
Noun
-
a reddish-brown chloride of heme; produced from hemoglobin in laboratory tests for the presence of blood
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