Vitamin K is a group of naphthoquinone derivatives 2 - menadione, is a human vitamins, with a hydrophobic. It is a special post-translational protein necessary, particularly in the blood coagulation protein necessary. Vitamin K2 (menaquinone (Menaquinone) and four Menatetrenone (Menatetrenone)) is usually manufactured by bacteria in the intestines of animals, so vitamin K deficiency is extremely rare unless there is severe intestinal damage. In addition to natural vitamin K1, K2, there are also synthetic vitamin K3, K4.
Vitamin K is a family of compounds of similar structure, their common methylated naphthoquinone ring, but at position 3 of the hydrocarbon side chain is different. Phylloquinone (Phylloquinone. Also known as vitamin K1) with the side chain of four isoprene (isoprenoid) residues, one of which is unsaturated known. Menadione (Menaquinone, vitamin K2) an unsaturated side chain known unequal number of isoprene chains, commonly referred to as MK-n, n represents the number of isoprene chains. MK-4, 5,7 equal activity with vitamin K1. MK-1 only 1% of the activity of vitamin K1, MK-10 is only 30 to 49% of the active. Menadione (Menadione, vitamin K3) is a synthetic product, but with toxicity.
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