title: Automated determination of folate catabolites in human biofluids (urine, breast milk and serum) by on-line SPE–HILIC–MS/MS.
abstract: A rapid, precise and fully-automated method for analysis of folate (vitamin B9) and its catabolites (viz. p-aminobenzoylglutamate and its acetamide derivative) in biofluids is here presented. The method is based on on-line hyphenation of solid-phase extraction (SPE) by a Prospekt 2 system with hydrophilic interaction liquid chromatography–tandem mass spectrometry (HILIC–MS/MS). The method was analytically characterized by estimation of repeatability (RSD, n = 5, between 0.5 and 4.1%), accuracy (between 96 and 105%), and sensitivity (limits of quantificantion between 0.3 and 8.3 ng/mL (1.1 and 18.8 pmol/mL) or 0.03 and 0.83 ng (0.11 and 1.88 pmol)). The proposed method is suited for routine analysis of folate catabolites as biomarkers to monitor deficiency of vitamin B9.
authors.affiliation: Department of Analytical Chemistry, Campus of Rabanales, University of Córdoba, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Álvarez-Sánchez
authors.forename: F
authors.initials: F
authors.lastname: Priego-Capote
authors.forename: J M
authors.initials: JM
authors.lastname: Mata-Granados
authors.forename: M D
authors.initials: MD
authors.lastname: Luque de Castro
mesh_terms: D001331:Automation; D002853:Chromatography, Liquid / Q000379:methods*; D005492:Folic Acid / Q000032:analysis* / Q000097:blood / Q000652:urine; D006801:Humans; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D016014:Linear Models; D008895:Milk, Human / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D005492:Folic Acid