Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 67, Issue 23, Pages 6658-6664Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.9b01617
Keywords
cloud point extraction; K vitamins; liquid chromatography-tandem mass spectrometry; menadione; menaquinone; phylloquinone; vegetables
Funding
- Comunidad Autonoma de la Region de Murcia (Fundacion Seneca) [19888/GERM/15]
- Spanish MINECO [PGC2018-098363-B-100]
- European Commission (FEDER/ERDF)
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Liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) with a triple quadrupole (QqQ) is proposed for determining the vitamin K homologues, phylloquinone (PK), menaquinone-4 (MK) and menadione (MD), in vegetables. The analytes were isolated from the samples (1-1.5 g) by ultrasound assisted extraction using acetonitrile (2 mL), and the liquids were submitted to microwave assisted cloud point extraction with Triton X-45. The enrichment factors were between 20 and 50, depending on the vitamin homologue in question. The analytes were determined by LC-ESI-QqQMS/MS in the multiple reaction monitoring (MRM) mode, providing unequivocal identification and quantification, with limits of detection of 0.8, 1.0, and 16 ng/g for MK, PK, and MD, respectively. Recovery assays for samples spiked at two concentration levels, between 40 and 600 ng/g depending on the compound, provided recoveries in the 90-114% range. Only PK was detected in the samples analyzed, at concentrations in the 90-2350 ng/g range.
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