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Haematin (also known as hematin, ferriheme, hematosin, hydroxyhemin, oxyheme, phenodin, or oxyhemochromogen) is a dark bluish or brownish pigment containing iron in the ferric state, obtained by the oxidation of haem. [1] Haematin inhibits the synthesis of porphyrin (by repressing ALAS1 synthesis), [2] and stimulates the synthesis of globin.
In acidic solutions, complexes of hematein with metals (usually aluminium or iron, but also chromium, zirconium and several others) are used as biological stains. Aluminium-haematein (haemalum) is the "routine" stain for cell nuclei in sections of human and other animal tissues.
Hemin is protoporphyrin IX containing a ferric iron (Fe 3+) ion with a coordinating chloride ligand.. Chemically, hemin differs from the related heme-compound hematin chiefly in that the coordinating ion is a chloride ion in hemin, whereas the coordinating ion is a hydroxide ion in hematin. [2]
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A hematinic is a nutrient required for the formation of blood cells in the process of hematopoiesis. [1] The main hematinics are iron, Vitamin B 12, and folate. [2] Deficiency in hematinics can lead to anaemia.
Black-brown pigment was observed by Johann Heinrich Meckel [1] in 1847, in the blood and spleen of a person suffering from insanity. [2] However, it was not until 1849 that the presence of this pigment was connected to infection with malaria. [3]
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Heme arginate (or haem arginate) is a compound of heme and arginine used in the treatment of acute porphyrias. [1] [2] This heme product is only available outside the United States and is equivalent to hematin.