This article is missing information about drugbox or more Chembox Pharmacology.January 2021)(
Menaphthone; Vitamin K3; β-Methyl-1,4-naphthoquinone; 2-Methyl-1,4-naphthodione; 2-Methyl-1,4-naphthoquinone
3D model (JSmol)
CompTox Dashboard (EPA)
|Molar mass||172.183 g·mol−1|
|Appearance||Bright yellow crystals|
|Melting point||105 to 107 °C (221 to 225 °F; 378 to 380 K)|
|Flash point||113.8 °C (236.8 °F; 386.9 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|0.5 g/kg (oral, mouse)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Menadione is a natural organic compound with the formula C6H4(CO)2C2H(CH3). It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position. It is sometimes called vitamin K3. Use is allowed as a nutritional supplement in animal feed because of its vitamin K activity.
Menadione is converted to vitamin K2 (specifically, MK-4) by the prenyltransferase action of vertebrate UBIAD1. This reaction requires the hydroquinone (reduced) form of K3, menadiol, produced by an unidentified enzyme.
Menadione is also a circulating form of vitamin K, produced in small amounts (1–5%) after intestinal absorption of K1 and K2. This circulation explains the uneven tissue distribution of MK-4, especially since menadione can penetrate the blood-brain barrier. The cleavage enzyme is yet to be identified.
The compound is variously known as vitamin K3 and provitamin K3. Proponents of the latter name generally argue that the compound is not a real vitamin due to its artificial status (prior to its identification as a circulating intermediate) and its lack of a 3-methyl side chain preventing it from exert all the functions[which?] of the K vitamins.
Despite the fact that it can serve as a precursor to various types of vitamin K, menadione is generally not used as a nutritional supplement in economically developed countries. Menadione for human use at pharmaceutical strength is available in some countries with large lower income populations, such as India. The typical daily dose is 10 mg oral or 2 mg parenteral. It is used in the treatment of hypoprothrombinemia outside of the United States.
This section is missing information about mechanism (redox?).January 2021)(
Large doses[clarification needed] of menadione have been reported to cause adverse outcomes including hemolytic anemia due to glucose-6-phosphate dehydrogenase deficiency, neonatal brain or liver damage, or neonatal death in some rare cases. In the United States, over-the-counter menadione supplements are banned by the U.S. Food and Drug Administration because of their potential toxicity in human use.
Low-dose menadione is still used as an inexpensive micronutrient for livestock in many countries. Forms of menadione are also included in some pet foods in developed countries as a source of vitamin K. These doses have yielded no reported cases of toxicity from menadione in livestock or pets. Although handling may be hazardous, the European Food Safety Authority found in 2013 that it is an effective source of vitamin K in animal nutrition that does not pose a risk to the environment.
- The Merck Index, 11th Edition, 5714
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