Témbongkeun sumber pikeun Vitamin K

{{about|biomolekul nu katelah vitamin K|ubar nu kadang disebut vitamin K|ketamin}}
[[Image:Phylloquinone structure.svg|thumb|right|250px|Vitamin K<sub>1</sub> (fillokuinon). Boga cingcin [[naftokuinon]] fungsional jeung ranté gigir alifatik. Fillokuinon boga ranté gigir fitil.]]
'''Vitamin K''' (K tina "Vitamin-Koagulasi" dina basa Jérman<ref>{{Citation | last = Dam
  | first = Henrik | author-link = Henrik Dam | title = The Antihaemorrhagic Vitamin
Of The Chick | journal = Biochemical Journal | volume = XXIX | issue = 82 | pages = 1273–1285 | year = 1935 | url = http://www.biochemj.org/bj/029/1273/0291273.pdf}}</ref>) nujul ka sakumpulan [[vitamin]] [[lipofilik]], [[hidrofobik]] nu dipikabutuh pikeun [[modifikasi posttranslasi]] sababaraha jenis [[protéin]], utamana anu dipaké dina [[koagulasi getih]]. Sacara [[kimia]]wi mah nyaéta turunan 2-[[métil]]-[[1,4-naftokuinon]].

Vitamin K<sub>1</sub> ogé katelah [[fillokuinon]] atawa fitoménadion. Vitamin K<sub>2</sub> (ménakuinon, [[ménatétrenon]]) biasana dihaslikeun ku [[baktéri]] dina jero [[peujit]]. Ku kituna, jarang pisan nepi ka kakurangan, iwal mun peujitna ruksak parna antukna [[malabsorpsi|teu bisa nyerep]] molekulna, atawa alatan produksina kaganggu balukar tina loba teuing antibiotik{{Fact|date=Désémber 2007}}.

Aya tilu bentuk vitamin K sintétik: vitamin K3, K4 jeung K5; di antarana dipaké dina pikeun parab ingon (vitamin K3) jeung nginhibit tumuwuhna fungi (vitamin K5)<ref>Medical Encyclopedia: Vitamin K. 2009. Tiasa dibuka di http://www.nlm.nih.gov/medlineplus/ency/article/002407.htm</ref>.

== Wangun kimia ==
[[Image:Menaquinone.svg|thumb||right|250px|Vitamin K<sub>2</sub> (ménakuinon) nu cingcin gigirna diwangun ku sababaraha rupa résidu [[isoprénoid]].]]
Sakabéh kulawarga vitamin K boga wangun cingcin [[naftokuinon]] [[métilasi|dimétilan]] jeung rupa-rupa [[ranté gigir]] [[alifatik]] nu napel dina posisi-3 (tempo gambar 1). Béda ti nu séjén, [[fillokuinon]] (ogé katelah vitamin K<sub>1</sub>) dina ranté gigirna ngandung opat résidu [[isopréna|isoprénoid]], nu hiji di antarana henteu jenuh.

Ranté gigir ménakuinon diwangun ku sababaraha résidu isoprénoid teu jenuh; sacara umum dilambangkeun ku MK-n, nu n-na nunjukkeun jumlah isoprénoidna.

Sacara umum, naftokuinon dianggap gugus fungsi, antukna mékanismeu petana sarupa jeung sakabéh vitamin K. <!--Substantial differences may be expected, however, with respect to intestinal absorption, transport, tissue distribution, and bio-availability. These differences are caused by the different lipophilicity of the various side chains, and by the different food matrices in which they occur.
-->
== Rujukan ==
{{Reflist}}

== Tumbu kaluar ==
* [http://www.ars.usda.gov/is/AR/archive/jan00/green0100.htm Vitamin K: Another Reason to Eat Your Greens]
* [http://www.ctds.info/vitamink.html Vitamin K: Signs of Deficiency] {{Webarchive|url=https://web.archive.org/web/20090421140908/http://www.ctds.info/vitamink.html |date=2009-04-21 }}
* [http://www.merck.com/mrkshared/mmanual/section1/chapter3/3h.jsp Vitamin K Deficiency - from the Merck Manual]
* [http://www.aims.org.uk/Journal/Vol13No2/vitk.htm An Alternative Perspective on Vitamin K Prophylaxis]
* [http://k2book.com/preview.php Health Benefits of Vitamin K2] {{Webarchive|url=https://web.archive.org/web/20090902114537/http://k2book.com/preview.php |date=2009-09-02 }}
* [http://www.nal.usda.gov/fnic/foodcomp/Data/SR19/nutrlist/sr19w430.pdf Vitamin K Content - USDA National Nutrient Database for Standard Reference, Release 19] {{Webarchive|url=https://web.archive.org/web/20080406070538/http://www.nal.usda.gov/fnic/foodcomp/Data/SR19/nutrlist/sr19w430.pdf |date=2008-04-06 }}

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[[Kategori:Vitamin|K]]