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- W966287431 abstract "This chapter discusses methods for the isolation of vitamins K. The vitamins K are isolated by fairly simple procedures. Extraction of the natural starting material, either directly or after pretreatment with suitable solvents followed by chromatographic purification and recrystallization yields the desired products. The most common adsorbents used for column chromatography are aluminum oxide, silicic acid, silica gel, Decalso, Florisil, Permutite, Darco, and magnesium and zinc carbonate. Reversed-phase chromatography proved to be a very effective and mild purification method in this field. As adsorbent, polyethylene powder is recommended that gives material of excellent purity. Reversed-phase paper chromatography can be used successfully for the separation and identification of vitamins K. Various types of paper impregnation and solvent systems are applied, such as paraffin oils with dimethylformamide and petroleum jelly with dimethylformamide-water. The chapter describes the isolation, purification, and characterization of phylloquinone (I), of menaquinones-6, -7, and -9 (II, n = 5, 6, 8), of dihydromenaquinones-8 and -9 (III, n = 6, 7), of 2-demethylmenaquinones-l, -6, and -9 (IV, n = 0, 5, 8), and of chlorobiumquinone (V)." @default.
- W966287431 created "2016-06-24" @default.
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- W966287431 date "1971-01-01" @default.
- W966287431 modified "2023-09-27" @default.
- W966287431 title "[236] Isolation of vitamins K" @default.
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- W966287431 doi "https://doi.org/10.1016/s0076-6879(71)18038-x" @default.
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