Abstract
A quantitative method was developed for the assay of vitamin K in human colostrum and milk. The procedure combines preparative and analytical chromatography on silica gel in a nitrogen atmosphere followed by reversed phase high performance liquid chromatography (HPLC). Two HPLC steps were used: gradient separation with ultraviolet (UV) detection followed by isocratic separation detected electrochemically. Due to co-migrating impurities, UV detection alone is insufficient for identification of vitamin K. Exogenous vitamin K was shown to equilibrate with endogenous vitamin K in the samples. A statistical method was incorporated to control for experimental variability. Vitamin K1 was analyzed in 16 pooled milk samples from 7 donors and in individual samples from 15 donors at 1 month post-partrum. Vitamin K1 was present at 2.94±1.94 and 3.15±2.87 ng/mL in pools and in individuals, respectively. Menaquinones, the bacterial form of the vitamin, were not detected. The significance of experimental variation to studies of vitamin K in individuals is discussed.
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Abbreviations
- HDN:
-
hemorrhagic disease of the newborn
- HPLC:
-
high performance liquid chromatography
- k′:
-
(Ve−Vo)/Vo(Ve=elution volume
- Vo :
-
void volume
- OD:
-
optical density
- TBAP:
-
tetrabutyl ammonium perchlorate
- UV:
-
ultraviolet
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Canfield, L.M., Hopkinson, J.M., Lima, A.F. et al. Quantitation of vitamin K in human milk. Lipids 25, 406–411 (1990). https://doi.org/10.1007/BF02537985
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DOI: https://doi.org/10.1007/BF02537985