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Fat-soluble vitamin K is an essential component of the blood clotting process. Menaquinones are the naturally occurring form of vitamin K identified in bacteria. Lipid extracts were made from three bacteria originally isolated from the human neonatal gut and identified as Enterobacter agglomerans, Serratia marcescens and Enterococcus faecium. Following preparative thin layer chromatography (TLC), the lipid extracts were subjected to liquid chromatography-mass spectrometry (LC-MS) analysis. Peak analysis of the LC-MS data showed that the three bacteria produce various forms of menaquinone.
Cooke, G.,Behan, J., Costello, M., : Newly identified vitamin K-producing bacteria isolated from the neonatal faecal flora, Microbial Ecology in Health and Disease, 2006, Vol. 18, No. 3-4 : Pages 133-138, (doi:10.1080/08910600601048894)