Method for the Determination of Vitamin K Homologues in Human Plasma Using High-Performance Liquid Chromatography-Tandem Mass Spectrometry
作者:Yoshitomo Suhara、Maya Kamao、Naoko Tsugawa、Toshio Okano
DOI:10.1021/ac0489667
日期:2005.2.1
We report here the development of a precise and sensitive method for the determination of vitamin K homologues including phylloquinone (PK), menaquinone-4 (MK-4), and menaquinone-7 (MK-7) in human plasma using HPLC-tandem mass-mass spectrometry with atmospheric pressure chemical ionization (LC-APCI-MS/MS). The method involves the use of stable isotope 18O-labeled internal standard compounds, which were synthesized in our laboratory, and the selection of a precursor and product ion with a MS/MS multiple reaction monitoring method. The average intraassay and interassay variation values for PK, MK-4, and MK-7 were <10%. Average spiked recoveries from authentic compounds added to normal human plasma samples for PK, MK-4, and MK-7 were 98−102%. Mean plasma concentrations of PK, MK-4, and MK-7 from healthy subjects (n = 20) were 1.22 ± 0.57, 0.39 ± 0.46, and 6.37 ± 7.45 ng/mL, respectively. We conclude that this novel LC-APCI-MS/MS method should be useful for the evaluation of vitamin K status in postmenopausal women and elderly subjects and provides useful information for the treatment and prevention of osteoporosis with vitamin K.
我们在此报告利用高压化学电离高效液相色谱-串联质谱(LC-APCI-MS/MS)技术开发了一种精确灵敏的方法,用于测定人体血浆中的维生素 K 同源物,包括酞醌(PK)、甲萘醌-4(MK-4)和甲萘醌-7(MK-7)。该方法包括使用本实验室合成的稳定同位素 18O 标记的内标化合物,以及使用 MS/MS 多反应监测法选择前体离子和产物离子。PK、MK-4 和 MK-7 的测定内和测定间平均变异值均小于 10%。添加到正常人血浆样本中的 PK、MK-4 和 MK-7 真品的平均加标回收率为 98-102%。健康受试者(n = 20)血浆中 PK、MK-4 和 MK-7 的平均浓度分别为 1.22 ± 0.57、0.39 ± 0.46 和 6.37 ± 7.45 纳克/毫升。我们得出结论:这种新型的 LC-APCI-MS/MS 方法可用于评估绝经后妇女和老年受试者的维生素 K 状态,并为维生素 K 治疗和预防骨质疏松症提供有用的信息。