Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study.

Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study. Research Abstract Details 

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Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study. Abstract Text:

A simple procedure for determination of vitamin K1 was developed for routine compliance monitoring of supplemented infant formula and measurement of endogenous levels in milk and milk powders. Samples are digested with lipase and extracted into hexane; and aliquot is evaporated, reconstituted in methanol, and analyzed by reversed-phase LC. Post-column zinc reduction of phylloquinone facilitates detection by fluorescence. The procedure was subjected to an AOAC collaborative study involving 8 materials, each in blind duplicate, across the range of 5-120 micrograms/100 g solids and including NIST 1846 reference material. Thirty-three laboratories returned valid data which were then statistically analyzed for outliers and precision parameters. Mean RSDR (%) was 6.53 (4.33-10.94), with a mean HORRAT value of 0.33 (0.23-0.43) and RSDr:RSDR ratio of 0.74. K1 isomers (cis and trans) were aggregated with conventional C18 columns, but may be selectively estimated with use of the C30 column.

Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study. Publishing Authors By Initials

For similar organic chemicals: hydrocarbons: hydrocarbons, cyclic: hydrocarbons, aromatic: polycyclic hydrocarbons, aromatic: naphthalenes: naphthoquinones: vitamin k research abstracts see: organic chemicals: hydrocarbons: hydrocarbons, cyclic: hydrocarbons, aromatic: polycyclic hydrocarbons, aromatic: naphthalenes: naphthoquinones: vitamin k research

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Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of AOAC International

VOLUME: 83

Page Numbers: 121-30

Journal Abbreviation: J AOAC Int

ISSN: 1060-3271

DAY: 17

MONTH: 03

YEAR: 2008

Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9215446

Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study. Keywords Mesh Terms:

KEYWORDS: Vitamin K

MESH TERMS: analysis

Chemical & Substance for Abstract: Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study. Information

Substance Name: Lipase

Registry Number: EC 3.1.1.3

Grant and Affiliation Information for Determination of vitamin K in milk and infant formulas by liquid chromatography: collaborative study.

AFFILIATION: Anchor Products, Waitoa, New Zealand.

Country: UNITED STATES

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MEDLINETA: J AOAC Int

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