Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry Any of a group of
polycyclic aromatic ketones , based on 2-methyl-1,4-naphthoquinone. - noun biochemistry Vitamin K2
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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One of the menaquinone forms of vitamin K (MK-4, also called menatetrenone) has repeatedly been show to block formation of too many osteoclasts and perhaps also to initiate their programmed cell death (a process called apoptosis).
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Proprioni bacteria, for example, make large amounts of one type of menaquinone called MK.9 (H4) and cheeses fermented by these bacteria can be a rich source of vitamin K. Swiss Emmental cheese and Norwegian Jarlsberg cheeses are examples of cheeses fermented by proprioni bacteria.
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Both phylloquinone and menaquinone forms of vitamin K are widely available in dietary supplement form.
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Supplements also commonly refer to the phylloquinone family of compounds as vitamin K1 and the menaquinone family of compounds as K2.
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In the case of MK-7, this specific menaquinone form of vitamin K is often extracted from a fermented soybean culture in which the bacterium
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Proprioni bacteria, for example, make large amounts of one type of menaquinone called MK.9 (H4) and cheeses fermented by these bacteria can be a rich source of vitamin K. Swiss Emmental cheese and Norwegian Jarlsberg cheeses are examples of cheeses fermented by proprioni bacteria.
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Vitamin K exists in two natural forms: vitamin K1, or phylloquinone, found largely in green leafy vegetables, as well as some vegetable oils, such as canola and soybean oils; and vitamin K2, or menaquinone, for which meat and cheese are the primary dietary sources.
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Vitamin K exists in two natural forms: vitamin K1, or phylloquinone, found largely in green leafy vegetables, as well as some vegetable oils, such as canola and soybean oils; and vitamin K2, or menaquinone, for which meat and cheese are the primary dietary sources.
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For example, it is possible to buy a supplement with purified amounts of a single menaquinone like MK-4 or MK-7.
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It is the MK-4 menaquinone form of vitamin K that has been best researched in this regard.
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