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Vitamin K (phylloquinone and menaquinones) in foods – Cost-effective quantification by LC-ESI-MS/MS

Jensen, Marie Bagge; Rød, Kari Elin Langeland; Švarc, Petra Ložnjak; Oveland, Eystein; Jakobsen, Jette Halkjær
Peer reviewed, Journal article
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URI
https://hdl.handle.net/11250/3019042
Date
2022
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Original version
Food Chemistry. 2022, 385 .   10.1016/j.foodchem.2022.132672
Abstract
Further research on vitamin K is necessary as growing evidence of vitamin K’s importance in human health beyond blood coagulation and bone health is emerging. We present a cost-effective LC-ESI-MS/MS method for quantification of phylloquinone (PK), and menaquinones (MK) 4–10 in food using deuterium labelled (d7) compounds (d7-PK, d7-MK-4, d7-MK-7 and d7-MK-9) as internal standards. The validation of the method included assessment of matrix effect, limit of quantification (LOQ), precision, and trueness. The LC-ESI-MS/MS method runtime is 9 min. The method was compared to a validated LC-FLD method (CEN 14148), for quantification of vitamin K in broccoli, cheese, natto, liver, and microalgae. LOQs of the LC-ESI-MS/MS method were ≤4 µg/100 g food. The intra- and inter-assay precision was <15% for PK, MK-4, MK-7 and MK-9; <20% for MK-5, MK-8, and MK-10, and ≤25% for MK-6. No significant differences between the quantified content by the LC-ESI-MS/MS and LC-FLD methods were observed.
Journal
Food Chemistry

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