Quantification of fat-soluble vitamins in human breast milk by liquid chromatography-tandem mass spectrometry.

Maya Kamao, Naoko Tsugawa, Yoshitomo Suhara, Akimori Wada, Toshiyuki Mori, Kazuo Murata, Riichiro Nishino, Tetsuya Ukita, Kazuhiro Uenishi, Kiyoshi Tanaka, Toshio Okano

文献索引：J. Chromatogr. B. Analyt. Technol. Biomed. Life Sci. 859(2) , 192-200, (2007)

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摘要

Sensitive quantification method for fat-soluble vitamins in human breast milk by liquid chromatography-tandem mass spectrometry was developed. Vitamins A, D and E were extracted from 10.0 mL of breast milk after saponifying by basic condition. Vitamin K derivatives were extracted from 3.0 mL of breast milk after lipase treatment. The corresponding stable isotope-labeled compounds were used as internal standards. For the determination of vitamin D compounds, derivatization with a Cookson-type reagent was performed. All fat-soluble vitamins were determined by liquid chromatography-tandem mass spectrometry in the positive ion mode. The detection limits of all analytes were 1-250 pg per 50 microL. The recoveries of fat-soluble vitamins were 91-105%. Inter-assay CV values of each vitamin were 1.9-11.9%. The mean concentrations of retinol, vitamin D3, 25-hydroxyvitamin D3, alpha-tocopherol, phylloquinone and menaquinone-4 were 0.455 microg/mL, 0.088 ng/mL, 0.081 ng/mL, 5.087 microg/mL, 3.771 ng/mL, and 1.795 ng/mL, respectively (n=82). This method makes possible to determine fat-soluble vitamins with a wide range of polarities in human breast milk. The assay may be useful for large-scale studies.