title: Determination of vitamin B6 vitamers and pyridoxic acid in biological samples.
abstract: For the determination of vitamin B6 vitamers (pyridoxal phosphate, pyridoxamine phosphate, pyridoxal, pyridoxine, pyridoxamine) and 4-pyridoxic acid in biological samples such as plasma, cerebrospinal fluid and rat brain regions, a sensitive micromethod using high-performance liquid chromatography (HPLC) with fluorescence detection in combination with post-column derivatization is described. Metaphosphoric acid tissue extracts with deoxypyridoxine as an internal standard were injected into the HPLC system with a binary gradient elution at a flow-rate of 1.2 ml/min. The excitation wavelength of the fluorescence detector was set at 328 nm and the emission wavelength at 393 nm with a 15-nm slit width for the photocell. This method allows the assay of vitamin B6 vitamers within 30 min in one chromatographic run. The present method has been applied extensively for the measurement of vitamin B6 vitamer levels in discrete brain regions of small animals, cells in culture and biopsy samples.
authors.affiliation: Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Manitoba, Winnipeg, Canada.
authors.forename: S K
authors.initials: SK
authors.lastname: Sharma
authors.forename: K
authors.initials: K
authors.lastname: Dakshinamurti
mesh_terms: D000818:Animals; D002478:Cells, Cultured / Q000737:chemistry; D002540:Cerebral Cortex / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D007668:Kidney / Q000737:chemistry; D008099:Liver / Q000737:chemistry; D011730:Pyridoxal / Q000032:analysis; D011732:Pyridoxal Phosphate / Q000032:analysis; D011733:Pyridoxamine / Q000031:analogs & derivatives / Q000032:analysis; D011735:Pyridoxic Acid / Q000032:analysis* / Q000097:blood / Q000134:cerebrospinal fluid; D011736:Pyridoxine / Q000032:analysis*; D051381:Rats
chemical_list: D011730:Pyridoxal; D011735:Pyridoxic Acid; D011732:Pyridoxal Phosphate; D011733:Pyridoxamine; D011736:Pyridoxine; C010627:pyridoxamine phosphate